mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-22 17:40:34 +00:00
9a46ee69d4
BYPASS CACHE was mistakenly documenting an earlier version of the patch. Correct it to document th committed version. Message-Id: <20181126125810.9344-1-avi@scylladb.com>
23 lines
779 B
Markdown
23 lines
779 B
Markdown
# Scylla CQL extensions
|
|
|
|
Scylla extends the CQL language to provide a few extra features. This document
|
|
lists those extensions.
|
|
|
|
## BYPASS CACHE clause
|
|
|
|
The `BYPASS CACHE` clause on `SELECT` statements informs the database that the data
|
|
being read is unlikely to be read again in the near future, and also
|
|
was unlikely to have been read in the near past; therefore no attempt
|
|
should be made to read it from the cache or to populate the cache with
|
|
the data. This is mostly useful for range scans; these typically
|
|
process large amounts of data with no temporal locality and do not
|
|
benefit from the cache.
|
|
|
|
The clause is placed immediately after the optional `ALLOW FILTERING`
|
|
clause:
|
|
|
|
SELECT ... FROM ...
|
|
WHERE ...
|
|
ALLOW FILTERING -- optional
|
|
BYPASS CACHE
|