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360f7b3d33
This commit moves the Features page from the section for developers to the top level in the page tree. This involves: - Moving the source files to the *features* folder from the *using-scylla* folder. - Moving images into *features/images* folder. - Updating references to the moved resources. - Adding redirections to the moved pages. Closes scylladb/scylladb#20401
57 lines
1.4 KiB
ReStructuredText
57 lines
1.4 KiB
ReStructuredText
Partition deletion
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------------------
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An example for deleting a partition is as follows:
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#. Start with a basic table and insert some data into it.
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.. code-block:: cql
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CREATE TABLE ks.t (pk int, ck int, v int, PRIMARY KEY (pk, ck)) WITH cdc = {'enabled':'true'};
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INSERT INTO ks.t (pk,ck,v) VALUES (0,0,0);
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INSERT INTO ks.t (pk,ck,v) VALUES (0,1,1);
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#. Display the contents of the base table
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.. code-block:: cql
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SELECT * FROM ks.t;
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returns:
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.. code-block:: none
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pk | ck | v
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----+----+---
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0 | 0 | 0
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0 | 1 | 1
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(2 rows)
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#. Remove all rows where the primary key is equal to 0.
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.. code-block:: cql
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DELETE FROM ks.t WHERE pk = 0;
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#. Display the contents of the corresponding CDC log table:
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.. code-block:: cql
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SELECT "cdc$batch_seq_no", pk, ck, v, "cdc$operation" FROM ks.t_scylla_cdc_log;
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returns:
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.. code-block:: none
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cdc$batch_seq_no | pk | ck | v | cdc$operation
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------------------+----+------+------+---------------
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0 | 0 | 0 | 0 | 2
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0 | 0 | 1 | 1 | 2
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0 | 0 | null | null | 4
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(3 rows)
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In the CDC log, partition deletion is identified by ``cdc$operation = 4``. Columns in the log that correspond to clustering key and non-key columns in the base table are set to ``null``.
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