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Viewing changes to src/backend/utils/time/tqual.c

  • Committer: Bazaar Package Importer
  • Author(s): Martin Pitt
  • Date: 2009-07-01 17:41:41 UTC
  • mfrom: (1.1.4 upstream)
  • mto: This revision was merged to the branch mainline in revision 6.
  • Revision ID: james.westby@ubuntu.com-20090701174141-jfmn9tt8e69m950x
Tags: 8.4.0-1
* Final 8.4.0 release. Major enhancements:
  - Windowing Functions
  - Common Table Expressions and Recursive Queries
  - Default and variadic parameters for functions
  - Parallel Restore
  - Column Permissions
  - Per-database locale settings
  - Improved hash indexes
  - Improved join performance for EXISTS and NOT EXISTS queries
  - Easier-to-use Warm Standby
  - Automatic sizing of the Free Space Map
  - Visibility Map (greatly reduces vacuum overhead for slowly-changing
    tables)
  - Version-aware psql (backslash commands work against older servers)
  - Support SSL certificates for user authentication
  - Per-function runtime statistics
  - Easy editing of functions in psql
  - New contrib modules: pg_stat_statements, auto_explain, citext,
    btree_gin 
  Upload to unstable, 8.4 is the new default. 
* debian/control: Build the versionless metapackages and have them point to
  8.4.

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src/backend/utils/time/tqual.c
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 *
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 * Summary of visibility functions:
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 *
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 *   HeapTupleSatisfiesMVCC()
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 *        visible to supplied snapshot, excludes current command
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 *   HeapTupleSatisfiesNow()
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 *        visible to instant snapshot, excludes current command
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 *   HeapTupleSatisfiesUpdate()
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 *        like HeapTupleSatisfiesNow(), but with user-supplied command
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 *        counter and more complex result
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 *   HeapTupleSatisfiesSelf()
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 *        visible to instant snapshot and current command
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 *   HeapTupleSatisfiesDirty()
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 *        like HeapTupleSatisfiesSelf(), but includes open transactions
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 *   HeapTupleSatisfiesVacuum()
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 *        visible to any running transaction, used by VACUUM
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 *   HeapTupleSatisfiesToast()
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 *        visible unless part of interrupted vacuum, used for TOAST
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 *   HeapTupleSatisfiesAny()
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 *        all tuples are visible
 
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 *       HeapTupleSatisfiesMVCC()
 
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 *                visible to supplied snapshot, excludes current command
 
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 *       HeapTupleSatisfiesNow()
 
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 *                visible to instant snapshot, excludes current command
 
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 *       HeapTupleSatisfiesUpdate()
 
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 *                like HeapTupleSatisfiesNow(), but with user-supplied command
 
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 *                counter and more complex result
 
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 *       HeapTupleSatisfiesSelf()
 
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 *                visible to instant snapshot and current command
 
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 *       HeapTupleSatisfiesDirty()
 
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 *                like HeapTupleSatisfiesSelf(), but includes open transactions
 
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 *       HeapTupleSatisfiesVacuum()
 
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 *                visible to any running transaction, used by VACUUM
 
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 *       HeapTupleSatisfiesToast()
 
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 *                visible unless part of interrupted vacuum, used for TOAST
 
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 *       HeapTupleSatisfiesAny()
 
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 *                all tuples are visible
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 *
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 * Portions Copyright (c) 1996-2009, 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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 * IDENTIFICATION
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 *        $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.112 2009/03/09 13:08:05 momjian Exp $
 
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 *        $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.113 2009/06/11 14:49:06 momjian Exp $
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 *
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 *-------------------------------------------------------------------------
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 */