diff options
| author | Kevin Grittner | 2016-05-06 12:47:12 +0000 |
|---|---|---|
| committer | Kevin Grittner | 2016-05-06 12:47:12 +0000 |
| commit | 2cc41acd8fa3ebb8f0501c6102a253fb7053cf46 (patch) | |
| tree | da067fb39fbe366b6f15746173050582e2b8f56c /src/include | |
| parent | 9b66aa006f81b2705337ca223daeeabf4db6453a (diff) | |
Fix hash index vs "snapshot too old" problemms
Hash indexes are not WAL-logged, and so do not maintain the LSN of
index pages. Since the "snapshot too old" feature counts on
detecting error conditions using the LSN of a table and all indexes
on it, this makes it impossible to safely do early vacuuming on any
table with a hash index, so add this to the tests for whether the
xid used to vacuum a table can be adjusted based on
old_snapshot_threshold.
While at it, add a paragraph to the docs for old_snapshot_threshold
which specifically mentions this and other aspects of the feature
which may otherwise surprise users.
Problem reported and patch reviewed by Amit Kapila
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/utils/rel.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index b5d82d60042..a0ba4177645 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -505,5 +505,6 @@ typedef struct ViewOptions /* routines in utils/cache/relcache.c */ extern void RelationIncrementReferenceCount(Relation rel); extern void RelationDecrementReferenceCount(Relation rel); +extern bool RelationHasUnloggedIndex(Relation rel); #endif /* REL_H */ |