92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* standby.h
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* Definitions for hot standby mode.
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*
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/standby.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef STANDBY_H
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#define STANDBY_H
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#include "storage/lock.h"
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#include "storage/procsignal.h"
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#include "storage/relfilenode.h"
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#include "storage/standbydefs.h"
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/* User-settable GUC parameters */
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extern int vacuum_defer_cleanup_age;
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extern int max_standby_archive_delay;
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extern int max_standby_streaming_delay;
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extern void InitRecoveryTransactionEnvironment(void);
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extern void ShutdownRecoveryTransactionEnvironment(void);
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extern void ResolveRecoveryConflictWithSnapshot(TransactionId latestRemovedXid,
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RelFileNode node);
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extern void ResolveRecoveryConflictWithTablespace(Oid tsid);
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extern void ResolveRecoveryConflictWithDatabase(Oid dbid);
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extern void ResolveRecoveryConflictWithLock(LOCKTAG locktag);
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extern void ResolveRecoveryConflictWithBufferPin(void);
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extern void CheckRecoveryConflictDeadlock(void);
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extern void StandbyDeadLockHandler(void);
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extern void StandbyTimeoutHandler(void);
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extern void StandbyLockTimeoutHandler(void);
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/*
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* Standby Rmgr (RM_STANDBY_ID)
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*
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* Standby recovery manager exists to perform actions that are required
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* to make hot standby work. That includes logging AccessExclusiveLocks taken
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* by transactions and running-xacts snapshots.
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*/
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extern void StandbyAcquireAccessExclusiveLock(TransactionId xid, Oid dbOid, Oid relOid);
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extern void StandbyReleaseLockTree(TransactionId xid,
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int nsubxids, TransactionId *subxids);
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extern void StandbyReleaseAllLocks(void);
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extern void StandbyReleaseOldLocks(TransactionId oldxid);
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#define MinSizeOfXactRunningXacts offsetof(xl_running_xacts, xids)
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/*
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* Declarations for GetRunningTransactionData(). Similar to Snapshots, but
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* not quite. This has nothing at all to do with visibility on this server,
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* so this is completely separate from snapmgr.c and snapmgr.h.
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* This data is important for creating the initial snapshot state on a
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* standby server. We need lots more information than a normal snapshot,
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* hence we use a specific data structure for our needs. This data
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* is written to WAL as a separate record immediately after each
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* checkpoint. That means that wherever we start a standby from we will
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* almost immediately see the data we need to begin executing queries.
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*/
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typedef struct RunningTransactionsData
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{
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int xcnt; /* # of xact ids in xids[] */
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int subxcnt; /* # of subxact ids in xids[] */
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bool subxid_overflow; /* snapshot overflowed, subxids missing */
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TransactionId nextXid; /* xid from ShmemVariableCache->nextFullXid */
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TransactionId oldestRunningXid; /* *not* oldestXmin */
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TransactionId latestCompletedXid; /* so we can set xmax */
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TransactionId *xids; /* array of (sub)xids still running */
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} RunningTransactionsData;
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typedef RunningTransactionsData *RunningTransactions;
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extern void LogAccessExclusiveLock(Oid dbOid, Oid relOid);
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extern void LogAccessExclusiveLockPrepare(void);
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extern XLogRecPtr LogStandbySnapshot(void);
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extern void LogStandbyInvalidations(int nmsgs, SharedInvalidationMessage *msgs,
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bool relcacheInitFileInval);
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#endif /* STANDBY_H */
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