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postgresql/src/include/postmaster/autovacuum.h

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Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
/*-------------------------------------------------------------------------
*
* autovacuum.h
* header file for integrated autovacuum daemon
*
*
Update copyright for the year 2010.
2010-01-02 17:58:17 +01:00
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
* Portions Copyright (c) 1994, Regents of the University of California
*
pgindent run for 9.0
2010-02-26 03:01:40 +01:00
* $PostgreSQL: pgsql/src/include/postmaster/autovacuum.h,v 1.18 2010/02/26 02:01:27 momjian Exp $
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
*
*-------------------------------------------------------------------------
*/
#ifndef AUTOVACUUM_H
#define AUTOVACUUM_H
Add a multi-worker capability to autovacuum. This allows multiple worker processes to be running simultaneously. Also, now autovacuum processes do not count towards the max_connections limit; they are counted separately from regular processes, and are limited by the new GUC variable autovacuum_max_workers. The launcher now has intelligence to launch workers on each database every autovacuum_naptime seconds, limited only on the max amount of worker slots available. Also, the global worker I/O utilization is limited by the vacuum cost-based delay feature. Workers are "balanced" so that the total I/O consumption does not exceed the established limit. This part of the patch was contributed by ITAGAKI Takahiro. Per discussion.
2007-04-16 20:30:04 +02:00
#include "storage/lock.h"
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
/* GUC variables */
Standard pgindent run for 8.1.
2005-10-15 04:49:52 +02:00
extern bool autovacuum_start_daemon;
Add a multi-worker capability to autovacuum. This allows multiple worker processes to be running simultaneously. Also, now autovacuum processes do not count towards the max_connections limit; they are counted separately from regular processes, and are limited by the new GUC variable autovacuum_max_workers. The launcher now has intelligence to launch workers on each database every autovacuum_naptime seconds, limited only on the max amount of worker slots available. Also, the global worker I/O utilization is limited by the vacuum cost-based delay feature. Workers are "balanced" so that the total I/O consumption does not exceed the established limit. This part of the patch was contributed by ITAGAKI Takahiro. Per discussion.
2007-04-16 20:30:04 +02:00
extern int autovacuum_max_workers;
Standard pgindent run for 8.1.
2005-10-15 04:49:52 +02:00
extern int autovacuum_naptime;
extern int autovacuum_vac_thresh;
extern double autovacuum_vac_scale;
extern int autovacuum_anl_thresh;
extern double autovacuum_anl_scale;
Fix recently-understood problems with handling of XID freezing, particularly in PITR scenarios. We now WAL-log the replacement of old XIDs with FrozenTransactionId, so that such replacement is guaranteed to propagate to PITR slave databases. Also, rather than relying on hint-bit updates to be preserved, pg_clog is not truncated until all instances of an XID are known to have been replaced by FrozenTransactionId. Add new GUC variables and pg_autovacuum columns to allow management of the freezing policy, so that users can trade off the size of pg_clog against the amount of freezing work done. Revise the already-existing code that forces autovacuum of tables approaching the wraparound point to make it more bulletproof; also, revise the autovacuum logic so that anti-wraparound vacuuming is done per-table rather than per-database. initdb forced because of changes in pg_class, pg_database, and pg_autovacuum catalogs. Heikki Linnakangas, Simon Riggs, and Tom Lane.
2006-11-05 23:42:10 +01:00
extern int autovacuum_freeze_max_age;
Standard pgindent run for 8.1.
2005-10-15 04:49:52 +02:00
extern int autovacuum_vac_cost_delay;
extern int autovacuum_vac_cost_limit;
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
Add a multi-worker capability to autovacuum. This allows multiple worker processes to be running simultaneously. Also, now autovacuum processes do not count towards the max_connections limit; they are counted separately from regular processes, and are limited by the new GUC variable autovacuum_max_workers. The launcher now has intelligence to launch workers on each database every autovacuum_naptime seconds, limited only on the max amount of worker slots available. Also, the global worker I/O utilization is limited by the vacuum cost-based delay feature. Workers are "balanced" so that the total I/O consumption does not exceed the established limit. This part of the patch was contributed by ITAGAKI Takahiro. Per discussion.
2007-04-16 20:30:04 +02:00
/* autovacuum launcher PID, only valid when worker is shutting down */
extern int AutovacuumLauncherPid;
Simplify and rename some GUC variables, per various recent discussions: * stats_start_collector goes away; we always start the collector process, unless prevented by a problem with setting up the stats UDP socket. * stats_reset_on_server_start goes away; it seems useless in view of the availability of pg_stat_reset(). * stats_block_level and stats_row_level are merged into a single variable "track_counts", which controls all reports sent to the collector process. * stats_command_string is renamed to track_activities. * log_autovacuum is renamed to log_autovacuum_min_duration to better reflect its meaning. The log_autovacuum change is not a compatibility issue since it didn't exist before 8.3 anyway. The other changes need to be release-noted.
2007-09-24 05:12:23 +02:00
extern int Log_autovacuum_min_duration;
Enable configurable log of autovacuum actions. Initial patch from Simon Riggs, additional code and docs by me. Per discussion.
2007-04-18 18:44:18 +02:00
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
/* Status inquiry functions */
extern bool AutoVacuumingActive(void);
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
2007-02-16 00:23:23 +01:00
extern bool IsAutoVacuumLauncherProcess(void);
extern bool IsAutoVacuumWorkerProcess(void);
pgindent run for 9.0
2010-02-26 03:01:40 +01:00
Change the autovacuum launcher to read pg_database directly, rather than via the "flat files" facility. This requires making it enough like a backend to be able to run transactions; it's no longer an "auxiliary process" but more like the autovacuum worker processes. Also, its signal handling has to be brought into line with backends/workers. In particular, since it now has to handle procsignal.c processing, the special autovac-launcher-only signal conditions are moved to SIGUSR2. Alvaro, with some cleanup from Tom
2009-08-31 21:41:00 +02:00
#define IsAnyAutoVacuumProcess() \
(IsAutoVacuumLauncherProcess() || IsAutoVacuumWorkerProcess())
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
/* Functions to start autovacuum process, called from postmaster */
extern void autovac_init(void);
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
2007-02-16 00:23:23 +01:00
extern int StartAutoVacLauncher(void);
extern int StartAutoVacWorker(void);
pgindent run for 8.3.
2007-11-15 22:14:46 +01:00
Improve autovacuum launcher's ability to detect a problem in worker startup, by having the postmaster signal it when certain failures occur. This requires the postmaster setting a flag in shared memory, but should be as safe as the pmsignal.c code is. Also make sure the launcher honor's a postgresql.conf change turning it off on SIGHUP.
2007-06-25 18:09:03 +02:00
/* called from postmaster when a worker could not be forked */
extern void AutoVacWorkerFailed(void);
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
Add a multi-worker capability to autovacuum. This allows multiple worker processes to be running simultaneously. Also, now autovacuum processes do not count towards the max_connections limit; they are counted separately from regular processes, and are limited by the new GUC variable autovacuum_max_workers. The launcher now has intelligence to launch workers on each database every autovacuum_naptime seconds, limited only on the max amount of worker slots available. Also, the global worker I/O utilization is limited by the vacuum cost-based delay feature. Workers are "balanced" so that the total I/O consumption does not exceed the established limit. This part of the patch was contributed by ITAGAKI Takahiro. Per discussion.
2007-04-16 20:30:04 +02:00
/* autovacuum cost-delay balancer */
extern void AutoVacuumUpdateDelay(void);
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
#ifdef EXEC_BACKEND
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
2007-02-16 00:23:23 +01:00
extern void AutoVacLauncherMain(int argc, char *argv[]);
extern void AutoVacWorkerMain(int argc, char *argv[]);
extern void AutovacuumWorkerIAm(void);
extern void AutovacuumLauncherIAm(void);
Integrate autovacuum functionality into the backend. There's still a few loose ends to be dealt with, but it seems to work. Alvaro Herrera, based on the contrib code by Matthew O'Connor.
2005-07-14 07:13:45 +02:00
#endif
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
2007-02-16 00:23:23 +01:00
/* shared memory stuff */
extern Size AutoVacuumShmemSize(void);
extern void AutoVacuumShmemInit(void);
Standard pgindent run for 8.1.
2005-10-15 04:49:52 +02:00
#endif /* AUTOVACUUM_H */