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Add a txn_start column to pg_stat_activity. This makes it easier to

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identify long-running transactions. Since we already need to record
the transaction-start time (e.g. for now()), we don't need any
additional system calls to report this information.

Catversion bumped, initdb required.
This commit is contained in:
Neil Conway
2006-12-06 18:06:48 +00:00
parent dd740e1fd0
commit 886a02d1cb
9 changed files with 77 additions and 21 deletions
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26
src/backend/postmaster/pgstat.c
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@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.140 2006/11/21 20:59:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.141 2006/12/06 18:06:47 neilc Exp $
* ----------
*/
#include "postgres.h"
@ -1355,6 +1355,7 @@ pgstat_bestart(void)
beentry->st_procpid = MyProcPid;
beentry->st_proc_start_timestamp = proc_start_timestamp;
beentry->st_activity_start_timestamp = 0;
beentry->st_txn_start_timestamp = 0;
beentry->st_databaseid = MyDatabaseId;
beentry->st_userid = userid;
beentry->st_clientaddr = clientaddr;
@ -1443,6 +1444,29 @@ pgstat_report_activity(const char *cmd_str)
Assert((beentry->st_changecount & 1) == 0);
}
/*
* Set the current transaction start timestamp to the specified
* value. If there is no current active transaction, this is signified
* by 0.
*/
void
pgstat_report_txn_timestamp(TimestampTz tstamp)
{
volatile PgBackendStatus *beentry = MyBEEntry;
if (!pgstat_collect_querystring || !beentry)
return;
/*
* Update my status entry, following the protocol of bumping
* st_changecount before and after. We use a volatile pointer
* here to ensure the compiler doesn't try to get cute.
*/
beentry->st_changecount++;
beentry->st_txn_start_timestamp = tstamp;
beentry->st_changecount++;
Assert((beentry->st_changecount & 1) == 0);
}
/* ----------
* pgstat_report_waiting() -