2005-06-18 00:32:51 +02:00
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/*-------------------------------------------------------------------------
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*
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* twophase_rmgr.h
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* Two-phase-commit resource managers definition
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*
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*
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2022-01-08 01:04:57 +01:00
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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2005-06-18 00:32:51 +02:00
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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2010-09-20 22:08:53 +02:00
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* src/include/access/twophase_rmgr.h
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2005-06-18 00:32:51 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TWOPHASE_RMGR_H
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#define TWOPHASE_RMGR_H
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typedef void (*TwoPhaseCallback) (TransactionId xid, uint16 info,
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void *recdata, uint32 len);
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typedef uint8 TwoPhaseRmgrId;
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/*
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* Built-in resource managers
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*/
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#define TWOPHASE_RM_END_ID 0
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#define TWOPHASE_RM_LOCK_ID 1
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2011-06-14 11:32:45 +02:00
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#define TWOPHASE_RM_PGSTAT_ID 2
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#define TWOPHASE_RM_MULTIXACT_ID 3
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#define TWOPHASE_RM_PREDICATELOCK_ID 4
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#define TWOPHASE_RM_MAX_ID TWOPHASE_RM_PREDICATELOCK_ID
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2005-06-18 00:32:51 +02:00
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extern const TwoPhaseCallback twophase_recover_callbacks[];
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extern const TwoPhaseCallback twophase_postcommit_callbacks[];
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extern const TwoPhaseCallback twophase_postabort_callbacks[];
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Allow read only connections during recovery, known as Hot Standby.
Enabled by recovery_connections = on (default) and forcing archive recovery using a recovery.conf. Recovery processing now emulates the original transactions as they are replayed, providing full locking and MVCC behaviour for read only queries. Recovery must enter consistent state before connections are allowed, so there is a delay, typically short, before connections succeed. Replay of recovering transactions can conflict and in some cases deadlock with queries during recovery; these result in query cancellation after max_standby_delay seconds have expired. Infrastructure changes have minor effects on normal running, though introduce four new types of WAL record.
New test mode "make standbycheck" allows regression tests of static command behaviour on a standby server while in recovery. Typical and extreme dynamic behaviours have been checked via code inspection and manual testing. Few port specific behaviours have been utilised, though primary testing has been on Linux only so far.
This commit is the basic patch. Additional changes will follow in this release to enhance some aspects of behaviour, notably improved handling of conflicts, deadlock detection and query cancellation. Changes to VACUUM FULL are also required.
Simon Riggs, with significant and lengthy review by Heikki Linnakangas, including streamlined redesign of snapshot creation and two-phase commit.
Important contributions from Florian Pflug, Mark Kirkwood, Merlin Moncure, Greg Stark, Gianni Ciolli, Gabriele Bartolini, Hannu Krosing, Robert Haas, Tatsuo Ishii, Hiroyuki Yamada plus support and feedback from many other community members.
2009-12-19 02:32:45 +01:00
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extern const TwoPhaseCallback twophase_standby_recover_callbacks[];
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2005-06-18 00:32:51 +02:00
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extern void RegisterTwoPhaseRecord(TwoPhaseRmgrId rmid, uint16 info,
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const void *data, uint32 len);
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#endif /* TWOPHASE_RMGR_H */
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