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efc16ea520
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.
37 lines
808 B
C
37 lines
808 B
C
/*
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* rmgr.h
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*
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* Resource managers definition
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*
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* $PostgreSQL: pgsql/src/include/access/rmgr.h,v 1.20 2009/12/19 01:32:42 sriggs Exp $
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*/
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#ifndef RMGR_H
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#define RMGR_H
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typedef uint8 RmgrId;
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/*
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* Built-in resource managers
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*
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* Note: RM_MAX_ID could be as much as 255 without breaking the XLOG file
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* format, but we keep it small to minimize the size of RmgrTable[].
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*/
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#define RM_XLOG_ID 0
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#define RM_XACT_ID 1
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#define RM_SMGR_ID 2
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#define RM_CLOG_ID 3
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#define RM_DBASE_ID 4
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#define RM_TBLSPC_ID 5
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#define RM_MULTIXACT_ID 6
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#define RM_STANDBY_ID 8
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#define RM_HEAP2_ID 9
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#define RM_HEAP_ID 10
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#define RM_BTREE_ID 11
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#define RM_HASH_ID 12
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#define RM_GIN_ID 13
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#define RM_GIST_ID 14
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#define RM_SEQ_ID 15
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#define RM_MAX_ID RM_SEQ_ID
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#endif /* RMGR_H */
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