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Prevent synchronous scan during GIN index build, because GIN is optimized

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for inserting tuples in increasing TID order.  It's not clear whether this
fully explains Ivan Sergio Borgonovo's complaint, but simple testing
confirms that a scan that doesn't start at block 0 can slow GIN build by
a factor of three or four.

Backpatch to 8.3.  Sync scan didn't exist before that.
This commit is contained in:
Tom Lane
2008-11-13 17:42:10 +00:00
parent 3379fae6de
commit 10e3acb8e7
6 changed files with 22 additions and 12 deletions
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4
src/backend/access/gist/gist.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.153 2008/11/03 20:47:48 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.154 2008/11/13 17:42:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -152,7 +152,7 @@ gistbuild(PG_FUNCTION_ARGS)
buildstate.tmpCtx = createTempGistContext();
/* do the heap scan */
reltuples = IndexBuildHeapScan(heap, index, indexInfo,
reltuples = IndexBuildHeapScan(heap, index, indexInfo, true,
gistbuildCallback, (void *) &buildstate);
/* okay, all heap tuples are indexed */