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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-04-19 18:50:56 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-04-19 18:50:56 -0400 |
| commit | 8c19977e9c515cc29af449a7ab6c25e496f539f3 (patch) | |
| tree | 847ff5b4afc0cf472bcae0faa96abd2021090f4e /src/backend/commands/indexcmds.c | |
| parent | c096d19b74a637443109e528000342e896b150f3 (diff) | |
| download | postgresql-8c19977e9c515cc29af449a7ab6c25e496f539f3.tar.gz postgresql-8c19977e9c515cc29af449a7ab6c25e496f539f3.zip | |
Avoid changing an index's indcheckxmin horizon during REINDEX.
There can never be a need to push the indcheckxmin horizon forward, since
any HOT chains that are actually broken with respect to the index must
pre-date its original creation. So we can just avoid changing pg_index
altogether during a REINDEX operation.
This offers a cleaner solution than my previous patch for the problem
found a few days ago that we mustn't try to update pg_index while we are
reindexing it. System catalog indexes will always be created with
indcheckxmin = false during initdb, and with this modified code we should
never try to change their pg_index entries. This avoids special-casing
system catalogs as the former patch did, and should provide a performance
benefit for many cases where REINDEX formerly caused an index to be
considered unusable for a short time.
Back-patch to 8.3 to cover all versions containing HOT. Note that this
patch changes the API for index_build(), but I believe it is unlikely that
any add-on code is calling that directly.
Diffstat (limited to 'src/backend/commands/indexcmds.c')
| -rw-r--r-- | src/backend/commands/indexcmds.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c index 2f4e751100d..53a6aafbbfb 100644 --- a/src/backend/commands/indexcmds.c +++ b/src/backend/commands/indexcmds.c @@ -505,7 +505,7 @@ DefineIndex(RangeVar *heapRelation, indexInfo->ii_BrokenHotChain = false; /* Now build the index */ - index_build(rel, indexRelation, indexInfo, primary); + index_build(rel, indexRelation, indexInfo, primary, false); /* Close both the relations, but keep the locks */ heap_close(rel, NoLock); |