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-rw-r--r--src/backend/commands/vacuumlazy.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index c4bf719ceba..d0010d336c0 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -38,7 +38,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.81.2.4 2007/09/24 03:53:02 alvherre Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.81.2.5 2009/01/06 14:55:50 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -181,8 +181,9 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
* number of pages. Otherwise, the time taken isn't worth it.
*/
possibly_freeable = vacrelstats->rel_pages - vacrelstats->nonempty_pages;
- if (possibly_freeable >= REL_TRUNCATE_MINIMUM ||
- possibly_freeable >= vacrelstats->rel_pages / REL_TRUNCATE_FRACTION)
+ if (possibly_freeable > 0 &&
+ (possibly_freeable >= REL_TRUNCATE_MINIMUM ||
+ possibly_freeable >= vacrelstats->rel_pages / REL_TRUNCATE_FRACTION))
lazy_truncate_heap(onerel, vacrelstats);
/* Update shared free space map with final free space info */