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f01d1ae3a1
Future patches are expected to introduce logical replication that works by decoding WAL. WAL contains relfilenodes rather than relation OIDs, so this infrastructure will be needed to find the relation OID based on WAL contents. If logical replication does not make it into this release, we probably should consider reverting this, since it will add some overhead to DDL operations that create new relations. One additional index insert per pg_class row is not a large overhead, but it's more than zero. Another way of meeting the needs of logical replication would be to the relation OID to WAL, but that would burden DML operations, not only DDL. Andres Freund, with some changes by me. Design review, in earlier versions, by Álvaro Herrera.
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* relmapper.h
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* Catalog-to-filenode mapping
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*
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*
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* Portions Copyright (c) 1996-2013, 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/utils/relmapper.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RELMAPPER_H
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#define RELMAPPER_H
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#include "access/xlog.h"
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/* ----------------
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* relmap-related XLOG entries
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* ----------------
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*/
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#define XLOG_RELMAP_UPDATE 0x00
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typedef struct xl_relmap_update
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{
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Oid dbid; /* database ID, or 0 for shared map */
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Oid tsid; /* database's tablespace, or pg_global */
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int32 nbytes; /* size of relmap data */
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char data[1]; /* VARIABLE LENGTH ARRAY */
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} xl_relmap_update;
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#define MinSizeOfRelmapUpdate offsetof(xl_relmap_update, data)
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extern Oid RelationMapOidToFilenode(Oid relationId, bool shared);
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extern Oid RelationMapFilenodeToOid(Oid relationId, bool shared);
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extern void RelationMapUpdateMap(Oid relationId, Oid fileNode, bool shared,
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bool immediate);
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extern void RelationMapRemoveMapping(Oid relationId);
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extern void RelationMapInvalidate(bool shared);
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extern void RelationMapInvalidateAll(void);
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extern void AtCCI_RelationMap(void);
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extern void AtEOXact_RelationMap(bool isCommit);
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extern void AtPrepare_RelationMap(void);
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extern void CheckPointRelationMap(void);
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extern void RelationMapFinishBootstrap(void);
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extern void RelationMapInitialize(void);
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extern void RelationMapInitializePhase2(void);
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extern void RelationMapInitializePhase3(void);
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extern void relmap_redo(XLogRecPtr lsn, XLogRecord *record);
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extern void relmap_desc(StringInfo buf, uint8 xl_info, char *rec);
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#endif /* RELMAPPER_H */
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