2001-08-25 20:52:43 +02:00
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/*
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* clog.h
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*
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* PostgreSQL transaction-commit-log manager
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*
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2012-01-02 00:01:58 +01:00
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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2001-08-25 20:52:43 +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/clog.h
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2001-08-25 20:52:43 +02:00
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*/
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#ifndef CLOG_H
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#define CLOG_H
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#include "access/xlog.h"
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/*
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* Possible transaction statuses --- note that all-zeroes is the initial
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* state.
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2004-07-01 02:52:04 +02:00
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*
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* A "subcommitted" transaction is a committed subtransaction whose parent
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* hasn't committed or aborted yet.
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2001-08-25 20:52:43 +02:00
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*/
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typedef int XidStatus;
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#define TRANSACTION_STATUS_IN_PROGRESS 0x00
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#define TRANSACTION_STATUS_COMMITTED 0x01
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#define TRANSACTION_STATUS_ABORTED 0x02
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2004-07-01 02:52:04 +02:00
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#define TRANSACTION_STATUS_SUB_COMMITTED 0x03
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2001-08-25 20:52:43 +02:00
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2005-12-07 00:08:34 +01:00
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/* Number of SLRU buffers to use for clog */
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#define NUM_CLOG_BUFFERS 8
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2009-06-11 16:49:15 +02:00
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extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids,
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TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
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2007-08-02 00:45:09 +02:00
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extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
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2001-08-25 20:52:43 +02:00
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2005-08-21 01:26:37 +02:00
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extern Size CLOGShmemSize(void);
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2001-08-25 20:52:43 +02:00
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extern void CLOGShmemInit(void);
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extern void BootStrapCLOG(void);
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extern void StartupCLOG(void);
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2011-11-02 09:07:44 +01:00
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extern void TrimCLOG(void);
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2001-08-25 20:52:43 +02:00
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extern void ShutdownCLOG(void);
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extern void CheckPointCLOG(void);
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extern void ExtendCLOG(TransactionId newestXact);
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extern void TruncateCLOG(TransactionId oldestXact);
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2004-08-24 01:22:45 +02:00
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/* XLOG stuff */
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#define CLOG_ZEROPAGE 0x00
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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
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#define CLOG_TRUNCATE 0x10
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2004-08-24 01:22:45 +02:00
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extern void clog_redo(XLogRecPtr lsn, XLogRecord *record);
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2006-03-24 05:32:13 +01:00
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extern void clog_desc(StringInfo buf, uint8 xl_info, char *rec);
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2001-10-28 07:26:15 +01:00
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2001-11-05 18:46:40 +01:00
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#endif /* CLOG_H */
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