Give VACUUM its own GUC parameter for memory usage, rather than

piggybacking on SortMem.  Add documentation for some recently-added
GUC parameters that had so far escaped it.

4 files changed, 18 insertions, 15 deletions

diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 8351da5e7df..3685217fb79 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -10,7 +10,7 @@
  * relations with finite memory space usage.  To do that, we set upper bounds
  * on the number of tuples and pages we will keep track of at once.
  *
- * We are willing to use at most SortMem memory space to keep track of
+ * We are willing to use at most VacuumMem memory space to keep track of
  * dead tuples.  We initially allocate an array of TIDs of that size.
  * If the array threatens to overflow, we suspend the heap scan phase
  * and perform a pass of index cleanup and page compaction, then resume
@@ -31,7 +31,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.6 2001/09/04 19:12:05 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.7 2001/09/21 03:32:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -865,8 +865,6 @@ count_nondeletable_pages(Relation onerel, LVRelStats *vacrelstats)
  * lazy_space_alloc - space allocation decisions for lazy vacuum
  *
  * See the comments at the head of this file for rationale.
- *
- * XXX Should we have our own GUC parameter, instead of using SortMem?
  */
 static void
 lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
@@ -874,8 +872,8 @@ lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
 	int			maxtuples;
 	int			maxpages;
 
-	maxtuples = (int) ((SortMem * 1024L) / sizeof(ItemPointerData));
-	/* stay sane if small SortMem */
+	maxtuples = (int) ((VacuumMem * 1024L) / sizeof(ItemPointerData));
+	/* stay sane if small VacuumMem */
 	if (maxtuples < MAX_TUPLES_PER_PAGE)
 		maxtuples = MAX_TUPLES_PER_PAGE;
 
@@ -910,7 +908,7 @@ lazy_record_dead_tuple(LVRelStats *vacrelstats,
 {
 	/*
 	 * The array shouldn't overflow under normal behavior,
-	 * but perhaps it could if we are given a really small SortMem.
+	 * but perhaps it could if we are given a really small VacuumMem.
 	 * In that case, just forget the last few tuples.
 	 */
 	if (vacrelstats->num_dead_tuples < vacrelstats->max_dead_tuples)
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index 935340ea01d..3a5ddee7bbf 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.59 2001/08/25 18:52:42 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.60 2001/09/21 03:32:35 tgl Exp $
  *
  * NOTES
  *	  Globals used all over the place should be declared here and not
@@ -82,6 +82,7 @@ char		FloatFormat[20] = "%f";
 bool		enableFsync = true;
 bool		allowSystemTableMods = false;
 int			SortMem = 512;
+int			VacuumMem = 8192;
 int			NBuffers = DEF_NBUFFERS;
 
 
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index ebb7745347e..5a5dcac47a6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4,7 +4,7 @@
  * Support for grand unified configuration scheme, including SET
  * command, configuration file, and command line options.
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.49 2001/09/20 14:20:27 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.50 2001/09/21 03:32:35 tgl Exp $
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  * Written by Peter Eisentraut <peter_e@gmx.net>.
@@ -176,12 +176,11 @@ struct config_string
  *
  * 4. Add a record below.
  *
- * 5. Add it to postgresql.conf.sample
+ * 5. Add it to src/backend/utils/misc/postgresql.conf.sample.
  *
- * 6. Don't forget to document that option.
- *
- * WHEN MAKING MODIFICATIONS, remember to update postgresql.conf.sample
+ * 6. Add it to src/bin/psql/tab-complete.c, if it's a USERSET option.
  *
+ * 7. Don't forget to document the option.
  */
 
 
@@ -298,6 +297,9 @@ static struct config_int
 	{"sort_mem", PGC_USERSET, &SortMem,
 	512, 4*BLCKSZ/1024, INT_MAX, NULL, NULL},
 
+	{"vacuum_mem", PGC_USERSET, &VacuumMem,
+	8192, 1024, INT_MAX, NULL, NULL},
+
 	{"debug_level", PGC_USERSET, &DebugLvl,
 	0, 0, 16, NULL, NULL},
 
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 8faf8304eba..c39e31d7483 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -53,7 +53,8 @@
 #
 #	Performance
 #
-#sort_mem = 512
+#sort_mem = 512             # min 32
+#vacuum_mem = 8192          # min 1024
 #fsync = true
 
 
@@ -173,10 +174,11 @@
 #
 #	Misc
 #
+#dynamic_library_path = '$libdir'
 #australian_timezones = false
 #deadlock_timeout = 1000
 #default_transaction_isolation = 'read committed'
 #max_expr_depth = 10000 # min 10
 #password_encryption = false
 #sql_inheritance = true
-
+#transform_null_equals = false