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https://github.com/postgres/postgres.git
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Tom Lane
0797bb5c50
end of a btree index. This isn't super-effective, since we won't move nondeletable pages, but it's better than nothing. Also, improve stats displayed during VACUUM VERBOSE.
119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* genam.h
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* POSTGRES generalized index access method definitions.
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*
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*
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* Portions Copyright (c) 1996-2002, 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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* $Id: genam.h,v 1.39 2003/02/24 00:57:17 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef GENAM_H
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#define GENAM_H
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#include "access/itup.h"
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#include "access/relscan.h"
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#include "access/sdir.h"
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#include "nodes/primnodes.h"
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/*
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* Struct for statistics returned by bulk-delete operation
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*
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* This is now also passed to the index AM's vacuum-cleanup operation,
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* if it has one, which can modify the results as needed. Note that
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* an index AM could choose to have bulk-delete return a larger struct
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* of which this is just the first field; this provides a way for bulk-delete
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* to communicate additional private data to vacuum-cleanup.
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*/
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typedef struct IndexBulkDeleteResult
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{
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BlockNumber num_pages; /* pages remaining in index */
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double num_index_tuples; /* tuples remaining */
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double tuples_removed; /* # removed by bulk-delete operation */
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BlockNumber pages_deleted; /* # unused pages in index */
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BlockNumber pages_free; /* # pages available for reuse */
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} IndexBulkDeleteResult;
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/* Typedef for callback function to determine if a tuple is bulk-deletable */
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typedef bool (*IndexBulkDeleteCallback) (ItemPointer itemptr, void *state);
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/* Struct for additional arguments passed to vacuum-cleanup operation */
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typedef struct IndexVacuumCleanupInfo
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{
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bool vacuum_full; /* VACUUM FULL (we have exclusive lock) */
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int message_level; /* elog level for progress messages */
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} IndexVacuumCleanupInfo;
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/* Struct for heap-or-index scans of system tables */
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typedef struct SysScanDescData
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{
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Relation heap_rel; /* catalog being scanned */
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Relation irel; /* NULL if doing heap scan */
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HeapScanDesc scan; /* only valid in heap-scan case */
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IndexScanDesc iscan; /* only valid in index-scan case */
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} SysScanDescData;
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typedef SysScanDescData *SysScanDesc;
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/*
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* generalized index_ interface routines (in indexam.c)
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*/
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extern Relation index_open(Oid relationId);
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extern Relation index_openrv(const RangeVar *relation);
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extern Relation index_openr(const char *sysRelationName);
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extern void index_close(Relation relation);
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extern InsertIndexResult index_insert(Relation indexRelation,
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Datum *datums, char *nulls,
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ItemPointer heap_t_ctid,
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Relation heapRelation,
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bool check_uniqueness);
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extern IndexScanDesc index_beginscan(Relation heapRelation,
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Relation indexRelation,
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Snapshot snapshot,
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int nkeys, ScanKey key);
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extern void index_rescan(IndexScanDesc scan, ScanKey key);
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extern void index_endscan(IndexScanDesc scan);
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extern void index_markpos(IndexScanDesc scan);
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extern void index_restrpos(IndexScanDesc scan);
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extern HeapTuple index_getnext(IndexScanDesc scan, ScanDirection direction);
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extern bool index_getnext_indexitem(IndexScanDesc scan,
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ScanDirection direction);
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extern IndexBulkDeleteResult *index_bulk_delete(Relation indexRelation,
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IndexBulkDeleteCallback callback,
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void *callback_state);
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extern IndexBulkDeleteResult *index_vacuum_cleanup(Relation indexRelation,
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IndexVacuumCleanupInfo *info,
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IndexBulkDeleteResult *stats);
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extern RegProcedure index_cost_estimator(Relation indexRelation);
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extern RegProcedure index_getprocid(Relation irel, AttrNumber attnum,
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uint16 procnum);
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extern struct FmgrInfo *index_getprocinfo(Relation irel, AttrNumber attnum,
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uint16 procnum);
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/*
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* index access method support routines (in genam.c)
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*/
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extern IndexScanDesc RelationGetIndexScan(Relation indexRelation,
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int nkeys, ScanKey key);
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extern void IndexScanEnd(IndexScanDesc scan);
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/*
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* heap-or-index access to system catalogs (in genam.c)
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*/
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extern SysScanDesc systable_beginscan(Relation heapRelation,
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const char *indexRelname,
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bool indexOK,
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Snapshot snapshot,
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int nkeys, ScanKey key);
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extern HeapTuple systable_getnext(SysScanDesc sysscan);
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extern void systable_endscan(SysScanDesc sysscan);
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#endif /* GENAM_H */
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