Add GUC update_process_title to control whether 'ps' display is updated

for every command, default to on.

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.323 2006/06/27 19:07:50 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.324 2006/06/27 22:16:44 momjian Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -64,6 +64,7 @@
 #include "utils/builtins.h"
 #include "utils/memutils.h"
 #include "utils/pg_locale.h"
+#include "utils/ps_status.h"
 #include "pgstat.h"
 #include "access/gin.h"
 
@@ -728,6 +729,16 @@ static struct config_bool ConfigureNamesBool[] =
 		true, NULL, NULL
 	},
 
+	{
+		{"update_process_title", PGC_SUSET, STATS_COLLECTOR,
+			gettext_noop("Updates the process title to show the active SQL command."),
+			gettext_noop("Enables updating of the process title every time a new
+            SQL command is received by the server.")
+		},
+		&update_process_title,
+		true, NULL, NULL
+	},
+
 	{
 		{"autovacuum", PGC_SIGHUP, AUTOVACUUM,
 			gettext_noop("Starts the autovacuum subprocess."),

src/backend/utils/misc/postgresql.conf.sample

@@ -323,11 +323,14 @@
 # - Query/Index Statistics Collector -
 
 #stats_command_string = on
+#update_process_title = on
+
 #stats_start_collector = on		# needed for block or row stats
 #stats_block_level = off
 #stats_row_level = off
 #stats_reset_on_server_start = off
 
+
 # - Statistics Monitoring -
 
 #log_parser_stats = off

src/backend/utils/misc/ps_status.c

@@ -5,7 +5,7 @@
  * to contain some useful information. Mechanism differs wildly across
  * platforms.
  *
- * $PostgreSQL: pgsql/src/backend/utils/misc/ps_status.c,v 1.30 2006/06/12 02:39:49 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/misc/ps_status.c,v 1.31 2006/06/27 22:16:44 momjian Exp $
  *
  * Copyright (c) 2000-2006, PostgreSQL Global Development Group
  * various details abducted from various places
@@ -31,6 +31,7 @@
 #include "utils/ps_status.h"
 
 extern char **environ;
+bool update_process_title = true;
 
 
 /*
@@ -210,7 +211,7 @@ save_ps_display_args(int argc, char **argv)
  */
 void
 init_ps_display(const char *username, const char *dbname,
-				const char *host_info)
+				const char *host_info, const char *initial_str)
 {
 	Assert(username);
 	Assert(dbname);
@@ -270,6 +271,7 @@ init_ps_display(const char *username, const char *dbname,
 
 	ps_buffer_fixed_size = strlen(ps_buffer);
 
+	set_ps_display(initial_str, true);
 #endif   /* not PS_USE_NONE */
 }
 
@@ -280,8 +282,12 @@ init_ps_display(const char *username, const char *dbname,
  * indication of what you're currently doing passed in the argument.
  */
 void
-set_ps_display(const char *activity)
+set_ps_display(const char *activity, bool force)
 {
+
+	if (!force && !update_process_title)
+		return;
+		
 #ifndef PS_USE_NONE
 	/* no ps display for stand-alone backend */
 	if (!IsUnderPostmaster)