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.

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},
 

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