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An inplace update's invalidation messages are part of its transaction's commit record. However, the update survives even if its transaction aborts or we stop recovery before replaying its transaction commit. After recovery, a backend that started in recovery could update the row without incorporating the inplace update. That could result in a table with an index, yet relhasindex=f. That is a source of index corruption. This bulk invalidation avoids the functional consequences. A future change can fix the !RecoveryInProgress() scenario without changing the WAL format. Back-patch to v17 - v12 (all supported versions). v18 will instead add invalidations to WAL. Discussion: https://postgr.es/m/20240618152349.7f.nmisch@google.com
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* sinvaladt.h
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* POSTGRES shared cache invalidation data manager.
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*
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* The shared cache invalidation manager is responsible for transmitting
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* invalidation messages between backends. Any message sent by any backend
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* must be delivered to all already-running backends before it can be
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* forgotten. (If we run out of space, we instead deliver a "RESET"
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* message to backends that have fallen too far behind.)
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*
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* The struct type SharedInvalidationMessage, defining the contents of
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* a single message, is defined in sinval.h.
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*
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* Portions Copyright (c) 1996-2024, 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/sinvaladt.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SINVALADT_H
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#define SINVALADT_H
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#include "storage/lock.h"
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#include "storage/sinval.h"
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/*
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* prototypes for functions in sinvaladt.c
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*/
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extern Size SInvalShmemSize(void);
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extern void CreateSharedInvalidationState(void);
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extern void SharedInvalBackendInit(bool sendOnly);
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extern void SIInsertDataEntries(const SharedInvalidationMessage *data, int n);
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extern int SIGetDataEntries(SharedInvalidationMessage *data, int datasize);
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extern void SICleanupQueue(bool callerHasWriteLock, int minFree);
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extern void SIResetAll(void);
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extern LocalTransactionId GetNextLocalTransactionId(void);
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#endif /* SINVALADT_H */
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