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Avoid creating init fork for unlogged indexes when it already exists.

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Report by Greg Sabino Mullane, diagnosis and preliminary patch by
Andres Freund, corrections by me.
This commit is contained in:
Robert Haas
2011-06-02 13:28:52 -04:00
parent 3980f7fc6e
commit b8be5431a2
1 changed files with 7 additions and 2 deletions
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9
src/backend/catalog/index.c
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@ -1741,9 +1741,14 @@ index_build(Relation heapRelation,
Assert(PointerIsValid(stats));
/*
* If this is an unlogged index, we need to write out an init fork for it.
* If this is an unlogged index, we may need to write out an init fork for
* it -- but we must first check whether one already exists. If, for
* example, an unlogged relation is truncated in the transaction that
* created it, or truncated twice in a subsequent transaction, the
* relfilenode won't change, and nothing needs to be done here.
*/
if (heapRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED)
if (heapRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED
&& !smgrexists(indexRelation->rd_smgr, INIT_FORKNUM))
{
RegProcedure ambuildempty = indexRelation->rd_am->ambuildempty;