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Implement rate-limiting logic on how often backends will attempt to send

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messages to the stats collector.  This avoids the problem that enabling
stats_row_level for autovacuum has a significant overhead for short
read-only transactions, as noted by Arjen van der Meijden.  We can avoid
an extra gettimeofday call by piggybacking on the one done for WAL-logging
xact commit or abort (although that doesn't help read-only transactions,
since they don't WAL-log anything).

In my proposal for this, I noted that we could change the WAL log entries
for commit/abort to record full TimestampTz precision, instead of only
time_t as at present.  That's not done in this patch, but will be committed
separately.
This commit is contained in:
Tom Lane
2007-04-30 03:23:49 +00:00
parent 57b82bf324
commit 957d08c81f
9 changed files with 104 additions and 47 deletions
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22
src/backend/commands/analyze.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.106 2007/04/19 16:26:44 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.107 2007/04/30 03:23:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -468,29 +468,15 @@ analyze_rel(Oid relid, VacuumStmt *vacstmt)
/* Log the action if appropriate */
if (IsAutoVacuumWorkerProcess() && Log_autovacuum >= 0)
{
long diff = 0L;
if (Log_autovacuum > 0)
{
TimestampTz endtime;
int usecs;
long secs;
endtime = GetCurrentTimestamp();
TimestampDifference(starttime, endtime, &secs, &usecs);
diff = secs * 1000 + usecs / 1000;
}
if (Log_autovacuum == 0 || diff >= Log_autovacuum)
{
if (Log_autovacuum == 0 ||
TimestampDifferenceExceeds(starttime, GetCurrentTimestamp(),
Log_autovacuum))
ereport(LOG,
(errmsg("automatic analyze of table \"%s.%s.%s\" system usage: %s",
get_database_name(MyDatabaseId),
get_namespace_name(RelationGetNamespace(onerel)),
RelationGetRelationName(onerel),
pg_rusage_show(&ru0))));
}
}
}