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3424bff90f
The alternative of disallowing index-only scans in HS operation was discussed, but the consensus was that it was better to treat marking a page all-visible as a recovery conflict for snapshots that could still fail to see XIDs on that page. We may in the future try to soften this, so that we simply force index scans to do heap fetches in cases where this may be an issue, rather than throwing a hard conflict.
34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* visibilitymap.h
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* visibility map interface
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*
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*
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* Portions Copyright (c) 2007-2012, 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/access/visibilitymap.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef VISIBILITYMAP_H
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#define VISIBILITYMAP_H
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#include "access/xlogdefs.h"
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#include "storage/block.h"
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#include "storage/buf.h"
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#include "utils/relcache.h"
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extern void visibilitymap_clear(Relation rel, BlockNumber heapBlk,
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Buffer vmbuf);
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extern void visibilitymap_pin(Relation rel, BlockNumber heapBlk,
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Buffer *vmbuf);
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extern bool visibilitymap_pin_ok(BlockNumber heapBlk, Buffer vmbuf);
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extern void visibilitymap_set(Relation rel, BlockNumber heapBlk,
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XLogRecPtr recptr, Buffer vmbuf, TransactionId cutoff_xid);
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extern bool visibilitymap_test(Relation rel, BlockNumber heapBlk, Buffer *vmbuf);
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extern BlockNumber visibilitymap_count(Relation rel);
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extern void visibilitymap_truncate(Relation rel, BlockNumber nheapblocks);
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#endif /* VISIBILITYMAP_H */
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