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| author | Heikki Linnakangas | 2017-07-12 19:03:38 +0000 |
|---|---|---|
| committer | Heikki Linnakangas | 2017-07-12 19:06:13 +0000 |
| commit | da11977de9c685ef808d3a293727f9ce26753ec4 (patch) | |
| tree | eea53c3ea5369db5ebb489e3133f7c234c102b62 /doc/src | |
| parent | ca793c59a51e94cedf8cbea5c29668bf8fa298f3 (diff) | |
Reduce memory usage of tsvector type analyze function.
compute_tsvector_stats() detoasted and kept in memory every tsvector value
in the sample, but that can be a lot of memory. The original bug report
described a case using over 10 gigabytes, with statistics target of 10000
(the maximum).
To fix, allocate a separate copy of just the lexemes that we keep around,
and free the detoasted tsvector values as we go. This adds some palloc/pfree
overhead, when you have a lot of distinct lexemes in the sample, but it's
better than running out of memory.
Fixes bug #14654 reported by James C. Reviewed by Tom Lane. Backport to
all supported versions.
Discussion: https://www.postgresql.org/message-id/20170514200602.1451.46797@wrigleys.postgresql.org
Diffstat (limited to 'doc/src')
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