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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-08-20 14:51:02 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-08-20 14:51:52 -0400 |
| commit | 6016005118295fdcd97d99a0f372f18a28251c48 (patch) | |
| tree | 25749e847ff0b3b56c09852a7d00e319f4adfeaf /src/backend/access/gist/gistxlog.c | |
| parent | 44631eec3298d25b7b6fa71fc237c076f4e2a3a3 (diff) | |
| download | postgresql-6016005118295fdcd97d99a0f372f18a28251c48.tar.gz postgresql-6016005118295fdcd97d99a0f372f18a28251c48.zip | |
Fix performance problem when building a lossy tidbitmap.
As pointed out by Sergey Koposov, repeated invocations of tbm_lossify can
make building a large tidbitmap into an O(N^2) operation. To fix, make
sure we remove more than the minimum amount of information per call, and
add a fallback path to behave sanely if we're unable to fit the bitmap
within the requested amount of memory.
This has been wrong since the tidbitmap code was written, so back-patch
to all supported branches.
Diffstat (limited to 'src/backend/access/gist/gistxlog.c')
0 files changed, 0 insertions, 0 deletions