database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

5
src/include/utils/timestamp.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.67 2007/02/16 03:39:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.68 2007/04/30 03:23:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -311,6 +311,9 @@ extern TimestampTz GetCurrentTimestamp(void);
extern void TimestampDifference(TimestampTz start_time, TimestampTz stop_time,
long *secs, int *microsecs);
extern bool TimestampDifferenceExceeds(TimestampTz start_time,
TimestampTz stop_time,
int msec);
extern TimestampTz time_t_to_timestamptz(time_t tm);
extern time_t timestamptz_to_time_t(TimestampTz t);