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Commit7ffe657

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Fix logic in lazy vacuum to decide if it's worth trying to truncate the heap.
If the table was smaller than REL_TRUNCATE_FRACTION (= 16) pages, we alwaystried to acquire AccessExclusiveLock on it even if there was no empty pagesat the end.Report by Simon Riggs. Back-patch all the way to 7.4.
1 parentb25433d commit7ffe657

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‎src/backend/commands/vacuumlazy.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -29,7 +29,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.115 2009/01/01 17:23:40 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.116 2009/01/06 14:55:37 heikki Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -183,8 +183,9 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
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* number of pages. Otherwise, the time taken isn't worth it.
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*/
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possibly_freeable=vacrelstats->rel_pages-vacrelstats->nonempty_pages;
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if (possibly_freeable >=REL_TRUNCATE_MINIMUM||
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possibly_freeable >=vacrelstats->rel_pages /REL_TRUNCATE_FRACTION)
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if (possibly_freeable>0&&
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(possibly_freeable >=REL_TRUNCATE_MINIMUM||
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possibly_freeable >=vacrelstats->rel_pages /REL_TRUNCATE_FRACTION))
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lazy_truncate_heap(onerel,vacrelstats);
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/* Vacuum the Free Space Map */

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