Release the exclusive lock on the table early after truncating it in lazy

vacuum, instead of waiting till commit.

diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 25e0e071a93e44dd9148d721823d435a90142c3b..f9167699fa28adddc8e4d6f353c7cdfe22ddbd0b 100644 (file)
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -36,7 +36,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.92 2007/09/10 17:58:45 alvherre Exp $
+ *   $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.93 2007/09/10 21:40:03 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -802,6 +802,9 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
     */
    RelationTruncate(onerel, new_rel_pages);
 
+   /* Now we're OK to release the lock. */
+   UnlockRelation(onerel, AccessExclusiveLock);
+
    /*
     * Drop free-space info for removed blocks; these must not get entered
     * into the FSM!
@@ -834,10 +837,6 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
    vacrelstats->rel_pages = new_rel_pages;
    vacrelstats->pages_removed = old_rel_pages - new_rel_pages;
 
-   /*
-    * We keep the exclusive lock until commit (perhaps not necessary)?
-    */
-
    ereport(elevel,
            (errmsg("\"%s\": truncated %u to %u pages",
                    RelationGetRelationName(onerel),