Move increase FSM warning to after lazy_truncate_heap() because the

function might reduce the number of free pages in the table.  Recommend
VACUUM FULL only if 20% free.

Simon Riggs.

diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 676d5687893e59a5984f83770b78ea426b18200c..b892ea19ab377b67bebfb26ac05727645c935663 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 1.83 2007/02/04 03:10:55 momjian Exp $
+ *   $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.84 2007/02/21 22:15:21 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -180,6 +180,16 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
    /* Update shared free space map with final free space info */
    lazy_update_fsm(onerel, vacrelstats);
 
+   if (vacrelstats->tot_free_pages > MaxFSMPages)
+       ereport(WARNING,
+               (errmsg("relation \"%s.%s\" contains more than \"max_fsm_pages\" pages with useful free space",
+                       get_namespace_name(RelationGetNamespace(onerel)),
+                       RelationGetRelationName(onerel)),
+                errhint("Consider%sincreasing the configuration parameter \"max_fsm_pages\".",
+                       /* Only suggest VACUUM FULL if 20% free */
+                       (vacrelstats->tot_free_pages > vacrelstats->rel_pages * 0.20
+                           ? " using VACUUM FULL on this relation or ": " "))));
+
    /* Update statistics in pg_class */
    vac_update_relstats(RelationGetRelid(onerel),
                        vacrelstats->rel_pages,
@@ -507,13 +517,6 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
                       vacrelstats->tot_free_pages,
                       empty_pages,
                       pg_rusage_show(&ru0))));
-
-   if (vacrelstats->tot_free_pages > MaxFSMPages)
-       ereport(WARNING,
-               (errmsg("relation \"%s.%s\" contains more than \"max_fsm_pages\" pages with useful free space",
-                       get_namespace_name(RelationGetNamespace(onerel)),
-                       relname),
-                errhint("Consider using VACUUM FULL on this relation or increasing the configuration parameter \"max_fsm_pages\".")));
 }