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<section id="configure-scylladb">
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<h1>Configure ScyllaDB<a class="headerlink" href="#configure-scylladb" title="Link to this heading">¶</a></h1>
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<p>System configuration steps are performed automatically by the ScyllaDB RPM and deb packages. For information on getting started with ScyllaDB, see <a class="reference internal" href="index.html"><span class="doc">Getting Started</span></a>.</p>
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<p>All ScyllaDB AMIs and Docker images are pre-configured by a script with the following steps. This document is provided as a reference.</p>
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<section id="system-configuration-files-and-scripts">
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<span id="id1"></span><h2>System Configuration Files and Scripts<a class="headerlink" href="#system-configuration-files-and-scripts" title="Link to this heading">¶</a></h2>
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<p>Several system configuration settings should be applied. For ease of use, the necessary scripts and configuration files are provided. Files are under <code class="code docutils literal notranslate"><span class="pre">dist/common</span></code> and <code class="code docutils literal notranslate"><span class="pre">seastar/scripts</span></code> in the ScyllaDB source code and installed in the appropriate system locations. (For information on ScyllaDB’s own configuration file, see ScyllaDB Configuration.)</p>
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<table class="docutils align-default" id="id2">
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<caption><span class="caption-text">System Configuration Files</span><a class="headerlink" href="#id2" title="Link to this table">¶</a></caption>
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<colgroup>
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<col style="width: 50.0%" />
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<col style="width: 50.0%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="head"><p>File Name</p></th>
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<th class="head"><p>Description</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p>scylla.conf</p></td>
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<td><p>Remove system resource limits</p></td>
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</tr>
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<tr class="row-odd"><td><p>scylla-server</p></td>
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<td><p>Server startup options</p></td>
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</tr>
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<tr class="row-even"><td><p>(written by <code class="docutils literal notranslate"><span class="pre">scylla_coredump_setup</span></code>, below)</p></td>
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<td><p>Configure core dumps to use the <code class="docutils literal notranslate"><span class="pre">scylla_save_coredump</span></code> script</p></td>
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</tr>
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</tbody>
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</table>
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</section>
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<section id="scylladb-scripts">
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<span id="system-configuration-scripts"></span><h2>ScyllaDB Scripts<a class="headerlink" href="#scylladb-scripts" title="Link to this heading">¶</a></h2>
|
||
<p>The following scripts are available for you to run for configuring ScyllaDB. Some of these scripts are included in the scylla_setup script. This script is used for configuring ScyllaDB the first time, or when the system hardware changes.</p>
|
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<table class="docutils align-default" id="id3">
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<caption><span class="caption-text">ScyllaDB Setup Scripts</span><a class="headerlink" href="#id3" title="Link to this table">¶</a></caption>
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<colgroup>
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<col style="width: 40.0%" />
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<col style="width: 60.0%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="head"><p>perftune.py</p></th>
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<th class="head"><p>Configures various system parameters in order to improve the Seastar application performance</p></th>
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</tr>
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</thead>
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<tbody>
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||
<tr class="row-even"><td><p>scylla_bootparam_setup</p></td>
|
||
<td><p>Sets the kernel options in the bootloader. In addition, it tunes Linux boot-time parameters for the node that ScyllaDB is running on (e.g. huge page setup).</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_coredump_setup</p></td>
|
||
<td><p>Sets up coredump facilities for ScyllaDB. This may include uninstalling existing crash reporting software for compatibility reasons.</p></td>
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||
</tr>
|
||
<tr class="row-even"><td><p>scylla_io_setup</p></td>
|
||
<td><p>Benchmarks the disks and generates the io.conf and io_properties.yaml files.</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_ntp_setup</p></td>
|
||
<td><p>Configures Network Time Protocol</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla_prepare</p></td>
|
||
<td><p>This script is run automatically every time ScyllaDB starts and the machine needs to be tuned.</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_raid_setup</p></td>
|
||
<td><p>Configures RAID and makes an XFS filesystem.</p></td>
|
||
</tr>
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||
<tr class="row-even"><td><p>scylla_save_coredump</p></td>
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||
<td><p>Compresses a core dump file (Ubuntu only)</p></td>
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||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_setup</p></td>
|
||
<td><p>Sets up the ScyllaDB configuration. Many of these scripts are included in the setup script.</p></td>
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</tr>
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<tr class="row-even"><td><p>scylla_stop</p></td>
|
||
<td><p>Resets network mode if running in virtio or DPDK mode.</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_swap_setup</p></td>
|
||
<td><p>Configures a swap space on the host.</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla_sysconfig_setup</p></td>
|
||
<td><p>Rewrites the /etc/sysconfig/scylla file.</p></td>
|
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</tr>
|
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</tbody>
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</table>
|
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<table class="docutils align-default" id="id4">
|
||
<caption><span class="caption-text">ScyllaDB Scripts (Not included with ScyllaDB-Setup)</span><a class="headerlink" href="#id4" title="Link to this table">¶</a></caption>
|
||
<colgroup>
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<col style="width: 40.0%" />
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||
<col style="width: 60.0%" />
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</colgroup>
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||
<thead>
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||
<tr class="row-odd"><th class="head"><p>Script Name</p></th>
|
||
<th class="head"><p>Description</p></th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr class="row-even"><td><p>node_health_check</p></td>
|
||
<td><p>Gathers metrics and information on the node, checking that the node is configured correctly.</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla-blocktune</p></td>
|
||
<td><p>Tunes the filesystem and block layer (e.g. block size I/O scheduler configuration) for ScyllaDB.</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla_cpuscaling_setup</p></td>
|
||
<td><p>Configures the CPU frequency scaling (IOW, puts the CPU in “performance” mode, instead of the slower “powersave” mode).</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_cpuset_setup</p></td>
|
||
<td><p>Configures which CPUs the ScyllaDB server threads run on.</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla_fstrim</p></td>
|
||
<td><p>Runs <code class="docutils literal notranslate"><span class="pre">fstrim</span></code>, which cleans up unused blocks of data from your SSD storage device. It runs automatically if you run scylla_fstrim_set up (see below).</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_fstrim_setup</p></td>
|
||
<td><p>Configures a job so that <code class="docutils literal notranslate"><span class="pre">fstrim</span></code> runs automatically.</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla-housekeeping</p></td>
|
||
<td><p>Checks if there are new versions of ScyllaDB available, and also shares some telemetry information for us to keep track of what versions are installed on the field.</p></td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p>scylla_rsyslog_setup</p></td>
|
||
<td><p>Configures the “rsyslog” service, which is used to send logs to a remote server.</p></td>
|
||
</tr>
|
||
<tr class="row-even"><td><p>scylla_selinux_setup</p></td>
|
||
<td><p>Disables SELinux for ScyllaDB.</p></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<div class="admonition note" id="note-io">
|
||
<p class="admonition-title">Note</p>
|
||
<p>It’s important to keep I/O scheduler configuration in sync on nodes with the same hardware.
|
||
That’s why we recommend skipping running scylla_io_setup when provisioning a new node with exactly the same hardware setup as existing nodes in the cluster.</p>
|
||
<dl class="simple">
|
||
<dt>Instead, we recommend to copy the following files from an existing node to the new node after running scylla_setup and restart scylla-server service (if it is already running):</dt><dd><ul class="simple">
|
||
<li><p>/etc/scylla.d/io.conf</p></li>
|
||
<li><p>/etc/scylla.d/io_properties.yaml</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
<p>Using different I/O scheduler configuration may result in unnecessary bottlenecks.</p>
|
||
</div>
|
||
</section>
|
||
<section id="bootloader-settings">
|
||
<h2>Bootloader Settings<a class="headerlink" href="#bootloader-settings" title="Link to this heading">¶</a></h2>
|
||
<p>If ScyllaDB is installed on an Amazon AMI, the bootloader should provide the <code class="code docutils literal notranslate"><span class="pre">clocksource=tsc</span></code> and <code class="code docutils literal notranslate"><span class="pre">tsc=reliable</span></code> options. This enables an accurate, high-resolution <a class="reference external" href="https://software.intel.com/en-us/blogs/2013/06/20/eliminate-the-dreaded-clocksource-is-unstable-message-switch-to-tsc-for-a-stable">Time Stamp Counter (TSC)</a> for setting the system time.</p>
|
||
<p>This configuration is provided in the file <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/scylla_bootparam_setup</span></code>.</p>
|
||
</section>
|
||
<section id="remove-crash-reporting-software">
|
||
<h2>Remove Crash Reporting Software<a class="headerlink" href="#remove-crash-reporting-software" title="Link to this heading">¶</a></h2>
|
||
<p>Remove the <code class="code docutils literal notranslate"><span class="pre">apport-noui</span></code> or <code class="code docutils literal notranslate"><span class="pre">abrt</span></code> packages if present, and set up a location and file name pattern for core dumps.</p>
|
||
<p>This configuration is provided in the file <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/scylla_bootparam_setup</span></code>.</p>
|
||
</section>
|
||
<section id="set-up-network-time-synchronization">
|
||
<h2>Set Up Network Time Synchronization<a class="headerlink" href="#set-up-network-time-synchronization" title="Link to this heading">¶</a></h2>
|
||
<p>It is highly recommended to enforce time synchronization between ScyllaDB servers.</p>
|
||
<p>Run <code class="code docutils literal notranslate"><span class="pre">ntpstat</span></code> on all nodes to check that system time is synchronized. If you are running in a virtualized environment and your system time is set on the host, you may not need to run NTP on the guest. Check the documentation for your platform.</p>
|
||
<p>If you have your own time servers shared with an application using ScyllaDB, use the same NTP configuration as for your application servers. The script <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/scylla_ntp_setup</span></code> provides sensible defaults, using Amazon NTP servers if installed on the Amazon cloud, and other pool NTP servers otherwise.</p>
|
||
</section>
|
||
<section id="set-up-raid-and-filesystem">
|
||
<h2>Set Up RAID and Filesystem<a class="headerlink" href="#set-up-raid-and-filesystem" title="Link to this heading">¶</a></h2>
|
||
<p>Setting the file system to XFS is the most important and mandatory for production. ScyllaDB will significantly slow down without it.</p>
|
||
<p>The script <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/scylla_raid_setup</span></code> performs the necessary RAID configuration and XFS filesystem creation for ScyllaDB.</p>
|
||
<p>Arguments to the script are</p>
|
||
<ul class="simple">
|
||
<li><p><code class="code docutils literal notranslate"><span class="pre">-d</span></code> specify disks for RAID</p></li>
|
||
<li><p><code class="code docutils literal notranslate"><span class="pre">-r</span></code> MD device name for RAID</p></li>
|
||
<li><p><code class="code docutils literal notranslate"><span class="pre">-u</span></code> update /etc/fstab for RAID</p></li>
|
||
</ul>
|
||
<p>On the ScyllaDB AMI, the RAID configuration is handled automatically in the <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/scylla_prepare</span> <span class="pre">script</span></code>.</p>
|
||
</section>
|
||
<section id="cpu-pinning">
|
||
<h2>CPU Pinning<a class="headerlink" href="#cpu-pinning" title="Link to this heading">¶</a></h2>
|
||
<p>When installing ScyllaDB, it is highly recommended to use the <a class="reference internal" href="#"><span class="doc">scylla_setup</span></a> script.
|
||
ScyllaDB should not share CPUs with any CPU consuming process. In addition, when running ScyllaDB on AWS, we recommend pinning all NIC IRQs to CPU0 (due to the same reason). As a result, ScyllaDB should be prevented from running on CPU0 and its hyper-threading siblings. To verify that ScyllaDB is pinning CPU0, use the command below:
|
||
If the node has four or fewer CPUs, don’t use this option.</p>
|
||
<p>To verify:</p>
|
||
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>cat<span class="w"> </span>/etc/scylla.d/cpuset.conf
|
||
</pre></div>
|
||
</div>
|
||
<p>Example output:</p>
|
||
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>--cpuset<span class="w"> </span><span class="sb">`</span><span class="m">1</span>-15,17-31<span class="sb">`</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="networking">
|
||
<h2>Networking<a class="headerlink" href="#networking" title="Link to this heading">¶</a></h2>
|
||
<blockquote>
|
||
<div><p>To configure networking, we recommend running the <code class="docutils literal notranslate"><span class="pre">perftune.py</span></code> script with
|
||
the following parameters:</p>
|
||
<ul class="simple">
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">--tune</span> <span class="pre">net</span></code></p></li>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">--nic</span> <span class="pre"><your</span> <span class="pre">network</span> <span class="pre">interface</span> <span class="pre">name></span></code></p></li>
|
||
</ul>
|
||
</div></blockquote>
|
||
<p>See <a class="reference internal" href="../operating-scylla/admin-tools/perftune.html"><span class="doc">Seastar Perftune</span></a> for details.</p>
|
||
</section>
|
||
<section id="configuring-scylladb">
|
||
<h2>Configuring ScyllaDB<a class="headerlink" href="#configuring-scylladb" title="Link to this heading">¶</a></h2>
|
||
<p>Configuration for ScyllaDB itself is in the <a class="reference internal" href="../operating-scylla/admin.html#admin-scylla-configuration"><span class="std std-ref">ScyllaDB Configuration</span></a> section of the administration guide.</p>
|
||
</section>
|
||
<section id="development-system-configuration">
|
||
<h2>Development System Configuration<a class="headerlink" href="#development-system-configuration" title="Link to this heading">¶</a></h2>
|
||
<p><em>The following item is not required in production.</em></p>
|
||
<p>When working on DPDK support for ScyllaDB, enable hugepages.</p>
|
||
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nv">NR_HUGEPAGES</span><span class="o">=</span><span class="m">128</span>
|
||
mount<span class="w"> </span>-t<span class="w"> </span>hugetlbfs<span class="w"> </span>-o<span class="w"> </span><span class="nv">pagesize</span><span class="o">=</span><span class="m">2097152</span><span class="w"> </span>none<span class="w"> </span>/mnt/huge
|
||
mount<span class="w"> </span>-t<span class="w"> </span>hugetlbfs<span class="w"> </span>-o<span class="w"> </span><span class="nv">pagesize</span><span class="o">=</span><span class="m">2097152</span><span class="w"> </span>none<span class="w"> </span>/dev/hugepages/
|
||
<span class="k">for</span><span class="w"> </span>n<span class="w"> </span><span class="k">in</span><span class="w"> </span>/sys/devices/system/node/node?<span class="p">;</span><span class="w"> </span><span class="k">do</span>
|
||
<span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="nv">$NR_HUGEPAGES</span><span class="w"> </span>><span class="w"> </span><span class="nv">$n</span>/hugepages/hugepages-2048kB/nr_hugepages<span class="p">;</span>
|
||
<span class="k">done</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Huge page configuration is written to <code class="code docutils literal notranslate"><span class="pre">/etc/sysconfig/scylla-server</span></code> by the script <code class="code docutils literal notranslate"><span class="pre">/usr/lib/scylla/sysconfig_setup</span></code></p>
|
||
</section>
|
||
<section id="related-topics">
|
||
<h2>Related Topics<a class="headerlink" href="#related-topics" title="Link to this heading">¶</a></h2>
|
||
<p><a class="reference internal" href="../kb/system-limits.html"><span class="doc">System Limits</span></a> - outlines the system limits which should be set or removed.</p>
|
||
<p><a class="reference internal" href="index.html"><span class="doc">Getting Started</span></a></p>
|
||
</section>
|
||
</section>
|
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<p class="topic-title">On this page</p>
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<ul>
|
||
<li><a class="reference internal" href="#">Configure ScyllaDB</a><ul>
|
||
<li><a class="reference internal" href="#system-configuration-files-and-scripts">System Configuration Files and Scripts</a></li>
|
||
<li><a class="reference internal" href="#scylladb-scripts">ScyllaDB Scripts</a></li>
|
||
<li><a class="reference internal" href="#bootloader-settings">Bootloader Settings</a></li>
|
||
<li><a class="reference internal" href="#remove-crash-reporting-software">Remove Crash Reporting Software</a></li>
|
||
<li><a class="reference internal" href="#set-up-network-time-synchronization">Set Up Network Time Synchronization</a></li>
|
||
<li><a class="reference internal" href="#set-up-raid-and-filesystem">Set Up RAID and Filesystem</a></li>
|
||
<li><a class="reference internal" href="#cpu-pinning">CPU Pinning</a></li>
|
||
<li><a class="reference internal" href="#networking">Networking</a></li>
|
||
<li><a class="reference internal" href="#configuring-scylladb">Configuring ScyllaDB</a></li>
|
||
<li><a class="reference internal" href="#development-system-configuration">Development System Configuration</a></li>
|
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<li><a class="reference internal" href="#related-topics">Related Topics</a></li>
|
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</ul>
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<biel-search-button
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hide-ctrl-k="true"
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header-title="ScyllaDB chatbot (beta)"
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modal-position="top-center">
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Search
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</biel-search-button>
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<biel-button class="side-nav__ask-ai" project="ddfdo8m94k"
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header-title="ScyllaDB chatbot (beta)"
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button-position="default"
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modal-position="sidebar-right"
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button-style="dark">
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Ask AI
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6.2
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<ul class="menu scylla-dropdown__content">
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<li>
|
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<a href="system-configuration.html">6.2</a>
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</li>
|
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|
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<li>
|
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<a href="../../branch-6.1/getting-started/system-configuration.html">6.1</a>
|
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</li>
|
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|
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<li>
|
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<a href="../../branch-6.0/getting-started/system-configuration.html">6.0</a>
|
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</li>
|
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|
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|
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<li>
|
||
<a href="../../branch-5.4/getting-started/system-configuration.html">5.4</a>
|
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</li>
|
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|
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|
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|
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<li>
|
||
<a href="../../branch-5.2/getting-started/system-configuration.html">5.2</a>
|
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</li>
|
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|
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|
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|
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<li>
|
||
<a href="../../branch-5.1/getting-started/system-configuration.html">5.1</a>
|
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</li>
|
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/mig-tool-review.html">Migration Tools Overview</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-datadog.html">Integrate ScyllaDB with DataDog</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-kafka.html">Integrate ScyllaDB with Kafka</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-iota.html">Integrate ScyllaDB with IOTA Chronicle</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-spring.html">Integrate ScyllaDB with Spring</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/sink-kafka-connector.html">Shard-Aware Kafka Connector for ScyllaDB</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-ansible.html">Install ScyllaDB with Ansible</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-databricks.html">Integrate ScyllaDB with Databricks</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-jaeger.html">Integrate ScyllaDB with Jaeger Server</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/integrations/integration-mindsdb.html">Integrate ScyllaDB with MindsDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="tutorials.html">Tutorials</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/benchmarking-scylla.html">Benchmarking ScyllaDB</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/procedures/cassandra-to-scylla-migration-process.html">Migrate from Cassandra to ScyllaDB</a></li>
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<li class="toctree-l3"><a class="reference internal" href="installation-common/disable-housekeeping.html">Disable Housekeeping</a></li>
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||
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/runtime-authentication.html">Enable and Disable Authentication Without Downtime</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/create-superuser.html">Creating a Custom Superuser</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/gen-cqlsh-file.html">Generate a cqlshrc File</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/password-reset.html">Reset Authenticator Password</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/enable-authorization.html">Enable Authorization</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/authorization.html">Grant Authorization CQL Reference</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/certificate-authentication.html">Certificate-based Authentication</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/rbac-usecase.html">Role Based Access Control (RBAC)</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/client-node-encryption.html">Encryption: Data in Transit Client to Node</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/node-node-encryption.html">Encryption: Data in Transit Node to Node</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/generate-certificate.html">Generating a self-signed Certificate Chain Using openssl</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/security/saslauthd.html">Configure SaslauthdAuthenticator</a></li>
|
||
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|
||
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<li class="toctree-l2 has-children"><a class="reference internal" href="../operating-scylla/admin-tools/index.html">Admin Tools</a><input class="toctree-checkbox" id="toctree-checkbox-9" name="toctree-checkbox-9" type="checkbox"/><label for="toctree-checkbox-9"><i class="icon-chevron-right"></i></label><div class="break"></div><ul>
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||
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/scylla-sstable.html">ScyllaDB SStable</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/scylla-types.html">ScyllaDB Types</a></li>
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||
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/cassandra-stress.html">cassandra-stress</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/sstabledump.html">SSTabledump</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/sstablemetadata.html">SSTableMetadata</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="logging.html">ScyllaDB Logs</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/perftune.html">Seastar Perftune</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/virtual-tables.html">Virtual Tables</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/select-from-mutation-fragments.html">Reading mutation fragments</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/maintenance-socket.html">Maintenance socket</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/maintenance-mode.html">Maintenance mode</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/admin-tools/task-manager.html">Task manager</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l2"><a class="reference external" href="https://monitoring.docs.scylladb.com/">ScyllaDB Monitoring Stack</a></li>
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||
<li class="toctree-l2"><a class="reference external" href="https://operator.docs.scylladb.com/">ScyllaDB Operator</a></li>
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||
<li class="toctree-l2"><a class="reference external" href="https://manager.docs.scylladb.com/">ScyllaDB Manager</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../upgrade/upgrade-opensource/index.html">ScyllaDB Open Source Upgrade</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../upgrade/upgrade-to-enterprise/index.html">ScyllaDB Open Source to ScyllaDB Enterprise Upgrade</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../upgrade/ami-upgrade.html">ScyllaDB Image</a></li>
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||
<li class="toctree-l3"><a class="reference external" href="https://enterprise.docs.scylladb.com/stable/upgrade/upgrade-enterprise/index.html">ScyllaDB Enterprise</a></li>
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||
</ul>
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<li class="toctree-l3 current current-page"><a class="current reference internal" href="#">System Configuration Guide</a></li>
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|
||
<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/system-configuration/snitch.html">ScyllaDB Snitches</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../operating-scylla/benchmarking-scylla.html">Benchmarking ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../operating-scylla/diagnostics.html">ScyllaDB Diagnostic Tools</a></li>
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||
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<li class="toctree-l1 has-children"><a class="reference internal" href="../using-scylla/index.html">ScyllaDB for Developers</a><input class="toctree-checkbox" id="toctree-checkbox-12" name="toctree-checkbox-12" type="checkbox"/><label for="toctree-checkbox-12"><i class="icon-chevron-right"></i></label><div class="break"></div><ul>
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<li class="toctree-l2"><a class="reference external" href="https://docs.scylladb.com/stable/get-started/develop-with-scylladb/index.html">Develop with ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://docs.scylladb.com/stable/get-started/develop-with-scylladb/tutorials-example-projects.html">Tutorials and Example Projects</a></li>
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||
<li class="toctree-l2"><a class="reference external" href="https://docs.scylladb.com/stable/get-started/learn-resources/index.html">Learn to Use ScyllaDB</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../using-scylla/alternator/index.html">ScyllaDB Alternator</a></li>
|
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<li class="toctree-l3"><a class="reference internal" href="../using-scylla/drivers/cql-drivers/index.html">ScyllaDB CQL Drivers</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../using-scylla/drivers/dynamo-drivers/index.html">ScyllaDB DynamoDB Drivers</a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
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</li>
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<li class="toctree-l1 has-children"><a class="reference internal" href="../cql/index.html">CQL Reference</a><input class="toctree-checkbox" id="toctree-checkbox-14" name="toctree-checkbox-14" type="checkbox"/><label for="toctree-checkbox-14"><i class="icon-chevron-right"></i></label><div class="break"></div><ul>
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<li class="toctree-l2"><a class="reference internal" href="../cql/cqlsh.html">CQLSh: the CQL shell</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/appendices.html">Appendices</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/compaction.html">Compaction</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../cql/consistency.html">Consistency Levels</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/consistency-calculator.html">Consistency Level Calculator</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/ddl.html">Data Definition</a></li>
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<li class="toctree-l2 has-children"><a class="reference internal" href="../cql/dml.html">Data Manipulation</a><input class="toctree-checkbox" id="toctree-checkbox-15" name="toctree-checkbox-15" type="checkbox"/><label for="toctree-checkbox-15"><i class="icon-chevron-right"></i></label><div class="break"></div><ul>
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<li class="toctree-l3"><a class="reference internal" href="../cql/dml/select.html">SELECT</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../cql/dml/insert.html">INSERT</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../cql/dml/update.html">UPDATE</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../cql/dml/delete.html">DELETE</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../cql/dml/batch.html">BATCH</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/types.html">Data Types</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../cql/definitions.html">Definitions</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../cql/secondary-indexes.html">Global Secondary Indexes</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/time-to-live.html">Expiring Data with Time to Live (TTL)</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/functions.html">Functions</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../cql/wasm.html">Wasm support for user-defined functions</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/json.html">JSON Support</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../cql/mv.html">Materialized Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cql/non-reserved-keywords.html">Non-Reserved CQL Keywords</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../cql/reserved-keywords.html">Reserved CQL Keywords</a></li>
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||
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<li class="toctree-l2"><a class="reference internal" href="../alternator/getting-started.html">Getting Started With ScyllaDB Alternator</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../alternator/compatibility.html">ScyllaDB Alternator for DynamoDB users</a></li>
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||
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<li class="toctree-l2"><a class="reference internal" href="../features/local-secondary-indexes.html">Local Secondary Indexes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../features/counters.html">Counters</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-intro.html">CDC Overview</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-log-table.html">The CDC Log Table</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-basic-operations.html">Basic operations in CDC</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-streams.html">CDC Streams</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-stream-generations.html">CDC Stream Generations</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-querying-streams.html">Querying CDC Streams</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-advanced-types.html">Advanced column types</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-preimages.html">Preimages and postimages</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../features/cdc/cdc-consistency.html">Data Consistency in CDC</a></li>
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||
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||
</li>
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||
<li class="toctree-l2"><a class="reference internal" href="../features/workload-attributes.html">Workload Attributes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../architecture/ringarchitecture/index.html">ScyllaDB Ring Architecture</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../architecture/architecture-fault-tolerance.html">ScyllaDB Fault Tolerance</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../architecture/console-CL-full-demo.html">Consistency Level Console Demo</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../architecture/anti-entropy/read-repair.html">ScyllaDB Read Repair</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../operating-scylla/procedures/maintenance/repair.html">ScyllaDB Repair</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../architecture/sstable/sstable3/index.html">ScyllaDB SSTable - 3.x</a></li>
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||
</li>
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||
<li class="toctree-l2"><a class="reference internal" href="../architecture/raft.html">Raft Consensus Algorithm in ScyllaDB</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../architecture/zero-token-nodes.html">Zero-token Nodes</a></li>
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||
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/report-scylla-problem.html">Report a ScyllaDB problem</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/error-messages/index.html">Error Messages</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/log-level.html">Change Log Level</a></li>
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||
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/scylla-wont-start.html">ScyllaDB will not Start</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/python-error-no-module-named-yaml.html">ScyllaDB Python Script broken</a></li>
|
||
</ul>
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||
</li>
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||
<li class="toctree-l2 has-children"><a class="reference internal" href="../troubleshooting/upgrade/index.html">Upgrade</a><input class="toctree-checkbox" id="toctree-checkbox-25" name="toctree-checkbox-25" type="checkbox"/><label for="toctree-checkbox-25"><i class="icon-chevron-right"></i></label><div class="break"></div><ul>
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/missing-dotmount-files.html">Inaccessible configuration files after ScyllaDB upgrade</a></li>
|
||
</ul>
|
||
</li>
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||
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/failed-add-remove-replace.html">Failure to Add, Remove, or Replace a Node</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/failed-decommission.html">Failed Decommission Problem</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/timeouts.html">Cluster Timeouts</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/node-joined-without-any-data.html">Node Joined With No Data</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/nodetool-nullpointerexception.html">NullPointerException</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/failed-schema-sync.html">Failed Schema Sync</a></li>
|
||
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/large-partition-table.html">ScyllaDB Large Partitions Table</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/large-rows-large-cells-tables.html">ScyllaDB Large Rows and Cells Table</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/debugging-large-partition.html">Large Partitions Hunting</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/failed-update-schema.html">Failure to Update the Schema</a></li>
|
||
</ul>
|
||
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|
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/space-up.html">Space Utilization Increasing</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/drop-table-space-up.html">Disk Space is not Reclaimed</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/sstable-corruption.html">SSTable Corruption Problem</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/pointless-compactions.html">Pointless Compactions</a></li>
|
||
<li class="toctree-l3"><a class="reference external" href="https://monitoring.docs.scylladb.com/stable/use-monitoring/advisor/heavyCompaction.html">Limiting Compaction</a></li>
|
||
</ul>
|
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</li>
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/time-zone.html">Time Range Query Fails</a></li>
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/copy-from-failed.html">COPY FROM Fails</a></li>
|
||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/clients-table.html">CQL Connection Table</a></li>
|
||
</ul>
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||
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|
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||
<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/reverse-dns-sshd.html">Manager lists healthy nodes as down</a></li>
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||
</ul>
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<li class="toctree-l3"><a class="reference internal" href="../troubleshooting/autoremove-ubuntu.html">Removing ScyllaDB on Ubuntu breaks system packages</a></li>
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||
</ul>
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<li class="toctree-l2"><a class="reference internal" href="../kb/cdc-experimental-upgrade.html">Upgrading from experimental CDC</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/count-all-rows.html">Counting all rows in a table is slow</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/cqlsh-more.html">CQL Query Does Not Display Entire Result Set</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/cqlsh-results.html">When CQLSh query returns partial results with followed by “More”</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/custom-user.html">Run ScyllaDB and supporting services as a custom user:group</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/customizing-cpuset.html">Customizing CPUSET</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/decode-stack-trace.html">Decoding Stack Traces</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/disk-utilization.html">Snapshots and Disk Utilization</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/dpdk-hardware.html">DPDK mode</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../kb/flamegraph.html">Debug your database with Flame Graphs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/gc-grace-seconds.html">How to Change gc_grace_seconds for a Table</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/gossip.html">Gossip in ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/increase-permission-cache.html">Increase Permission Cache to Avoid Non-paged Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/lwt-differences.html">How does ScyllaDB LWT Differ from Apache Cassandra ?</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/map-cpu.html">Map CPUs to ScyllaDB Shards</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/ntp.html">NTP Configuration for ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/perftune-modes-sync.html">Updating the Mode in perftune.yaml After a ScyllaDB Upgrade</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/posix.html">POSIX networking for ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/quiz-administrators.html">ScyllaDB consistency quiz for administrators</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/rf-increase.html">How to Safely Increase the Replication Factor</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/scylla-limits-systemd.html">Increase ScyllaDB resource limits over systemd</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/set-up-swap.html">How to Set up a Swap Space</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/snapshots.html">ScyllaDB Snapshots</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/static-columns.html">ScyllaDB payload sent duplicated static columns</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/stop-local-repair.html">Stopping a local repair</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/tombstones-flush.html">How to flush old tombstones from a table</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/ttl-facts.html">Time to Live (TTL) and Compaction</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/unresponsive-nodes.html">ScyllaDB Nodes are Unresponsive</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/update-pk.html">Update a Primary Key</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/use-perf.html">Using the perf utility with ScyllaDB</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../kb/yaml-address.html">Configure ScyllaDB Networking with Multiple NIC/IP Combinations</a></li>
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