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Commit0ad017f

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Update various obsolete remarks about VACUUM.
1 parentea6f2e6 commit0ad017f

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-27
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4 files changed

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‎doc/src/sgml/backup.sgml‎

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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/backup.sgml,v 2.18 2001/11/12 19:19:39 petere Exp $ -->
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/backup.sgml,v 2.19 2001/11/18 22:17:30 tgl Exp $ -->
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<chapter id="backup">
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<title>Backup and Restore</title>
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@@ -76,7 +76,7 @@ pg_dump <replaceable class="parameter">dbname</replaceable> &gt; <replaceable cl
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running will not be in the dump. <application>pg_dump</> does not
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block other operations on the database while it is working.
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(Exceptions are those operations that need to operate with an
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exclusive lock, such as <command>VACUUM</command>.)
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exclusive lock, such as <command>VACUUM FULL</command>.)
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</para>
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<important>

‎doc/src/sgml/maintenance.sgml‎

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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/maintenance.sgml,v 1.6 2001/11/12 19:19:39 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/maintenance.sgml,v 1.7 2001/11/18 22:17:30 tgl Exp $
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-->
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<chapter id="maintenance">
@@ -105,8 +105,8 @@ $Header: /cvsroot/pgsql/doc/src/sgml/maintenance.sgml,v 1.6 2001/11/12 19:19:39
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In normal <productname>PostgreSQL</productname> operation, an UPDATE or
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DELETE of a row does not immediately remove the old <firstterm>tuple</>
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(version of the row). This approach is necessary to gain the benefits
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of multiversion concurrency control (see the User's Guide): the tuple
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must not be deleted while
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of multiversion concurrency control (see the<citetitle>User's Guide</>):
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the tuplemust not be deleted while
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it is still potentially visible to other transactions. But eventually,
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an outdated or deleted tuple is no longer of interest to any transaction.
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The space it occupies must be reclaimed for reuse by new tuples, to avoid

‎doc/src/sgml/ref/analyze.sgml‎

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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/analyze.sgml,v 1.3 2001/10/16 01:13:44 tgl Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/analyze.sgml,v 1.4 2001/11/18 22:17:30 tgl Exp $
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Postgres documentation
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-->
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@@ -125,12 +125,12 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ (<rep
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just after making major changes in the contents of a table. Accurate
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statistics will help the planner to choose the most appropriate query
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plan, and thereby improve the speed of query processing. A common
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strategy is to run <command>VACUUM</command> and <command>ANALYZE</command>
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once a day during a low-usage time of day.
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strategy is to run <xref linkend="sql-vacuum" endterm="sql-vacuum-title">
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and <command>ANALYZE</command>once a day during a low-usage time of day.
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</para>
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<para>
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Unlike <xref linkend="sql-vacuum" endterm="sql-vacuum-title">,
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Unlike <command>VACUUM FULL</command>,
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<command>ANALYZE</command> requires
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only a read lock on the target table, so it can run in parallel with
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other activity on the table.

‎doc/src/sgml/ref/vacuum.sgml‎

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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.20 2001/10/12 23:34:30momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.21 2001/11/18 22:17:30tgl Exp $
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Postgres documentation
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-->
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@@ -207,8 +207,7 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
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intended usage is in connection with preparation of user-defined template
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databases, or other databases that are completely read-only and will not
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receive routine maintenance <command>VACUUM</> operations.
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See <xref linkend="sql-createdatabase" endterm="sql-createdatabase-title">
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for details.
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See the <citetitle>Administrator's Guide</> for details.
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</para>
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<refsect2 id="R2-SQL-VACUUM-3">
@@ -222,8 +221,7 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
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<para>
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We recommend that active production databases be
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<command>VACUUM</command>-ed frequently (at least nightly), in order to
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remove expired rows. After copying a large table into
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<productname>Postgres</productname> or after deleting a large number
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remove expired rows. After adding or deleting a large number
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of records, it may be a good idea to issue a <command>VACUUM
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ANALYZE</command> command for the affected table. This will update the
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system catalogs with
@@ -254,19 +252,19 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
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<programlisting>
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regression=> VACUUM VERBOSE ANALYZE onek;
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NOTICE: --Relation onek--
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NOTICE:Pages 98: Changed 25, Reapped 74, Empty 0, New 0;
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Tup 1000: Vac 3000, Crash 0, UnUsed 0, MinLen 188, MaxLen 188;
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Re-using: Free/Avail. Space 586952/586952; EndEmpty/Avail. Pages 0/74.
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Elapsed 0/0 sec.
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NOTICE: Indexonek_stringu1: Pages28; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
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NOTICE: Index onek_hundred: Pages 12; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
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NOTICE: Indexonek_unique2: Pages19; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
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NOTICE: Index onek_unique1: Pages 17; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
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NOTICE:Rel onek: Pages: 98 --> 25; Tuple(s) moved: 1000. Elapsed 0/1 sec.
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NOTICE: Index onek_stringu1: Pages 28; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
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NOTICE:Index onek_hundred: Pages 12; Tuples 1000:Deleted 1000. Elapsed 0/0 sec.
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NOTICE: Index onek_unique2: Pages 19; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
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NOTICE:Index onek_unique1: Pages 17; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
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NOTICE:Index onek_unique1: Pages 14; Tuples 1000: Deleted 3000.
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CPU 0.00s/0.11u sec elapsed 0.12 sec.
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NOTICE: Index onek_unique2: Pages 16; Tuples 1000: Deleted 3000.
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CPU 0.00s/0.10u sec elapsed 0.10 sec.
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NOTICE: Indexonek_hundred: Pages13; Tuples 1000: Deleted 3000.
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CPU 0.00s/0.10u sec elapsed 0.10 sec.
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NOTICE: Indexonek_stringu1: Pages31; Tuples 1000: Deleted 3000.
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CPU 0.01s/0.09u sec elapsed 0.10 sec.
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NOTICE:Removed 3000 tuples in 70 pages.
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CPU 0.02s/0.04u sec elapsed 0.07 sec.
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NOTICE:Pages 94: Changed 0, Empty 0; Tup 1000:Vac 3000, Keep 0, UnUsed 0.
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Total CPU 0.05s/0.45u sec elapsed 0.59 sec.
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NOTICE:Analyzing onek
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VACUUM
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</programlisting>
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</para>

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