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Update various obsolete remarks about VACUUM.

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This commit is contained in:
Tom Lane
2001-11-18 22:17:30 +00:00
parent ea6f2e6973
commit 0ad017fc64
4 changed files with 25 additions and 27 deletions
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8
doc/src/sgml/ref/analyze.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/analyze.sgml,v 1.3 2001/10/16 01:13:44 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/analyze.sgml,v 1.4 2001/11/18 22:17:30 tgl Exp $
Postgres documentation
-->
@@ -125,12 +125,12 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ (<rep
just after making major changes in the contents of a table. Accurate
statistics will help the planner to choose the most appropriate query
plan, and thereby improve the speed of query processing. A common
strategy is to run <command>VACUUM</command> and <command>ANALYZE</command>
once a day during a low-usage time of day.
strategy is to run <xref linkend="sql-vacuum" endterm="sql-vacuum-title">
and <command>ANALYZE</command> once a day during a low-usage time of day.
</para>
<para>
Unlike <xref linkend="sql-vacuum" endterm="sql-vacuum-title">,
Unlike <command>VACUUM FULL</command>,
<command>ANALYZE</command> requires
only a read lock on the target table, so it can run in parallel with
other activity on the table.

34
doc/src/sgml/ref/vacuum.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.20 2001/10/12 23:34:30 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.21 2001/11/18 22:17:30 tgl Exp $
Postgres documentation
-->
@@ -207,8 +207,7 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
intended usage is in connection with preparation of user-defined template
databases, or other databases that are completely read-only and will not
receive routine maintenance <command>VACUUM</> operations.
See <xref linkend="sql-createdatabase" endterm="sql-createdatabase-title">
for details.
See the <citetitle>Administrator's Guide</> for details.
</para>
<refsect2 id="R2-SQL-VACUUM-3">
@@ -222,8 +221,7 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
<para>
We recommend that active production databases be
<command>VACUUM</command>-ed frequently (at least nightly), in order to
remove expired rows. After copying a large table into
<productname>Postgres</productname> or after deleting a large number
remove expired rows. After adding or deleting a large number
of records, it may be a good idea to issue a <command>VACUUM
ANALYZE</command> command for the affected table. This will update the
system catalogs with
@@ -254,19 +252,19 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
<programlisting>
regression=> VACUUM VERBOSE ANALYZE onek;
NOTICE: --Relation onek--
NOTICE: Pages 98: Changed 25, Reapped 74, Empty 0, New 0;
Tup 1000: Vac 3000, Crash 0, UnUsed 0, MinLen 188, MaxLen 188;
Re-using: Free/Avail. Space 586952/586952; EndEmpty/Avail. Pages 0/74.
Elapsed 0/0 sec.
NOTICE: Index onek_stringu1: Pages 28; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
NOTICE: Index onek_hundred: Pages 12; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
NOTICE: Index onek_unique2: Pages 19; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
NOTICE: Index onek_unique1: Pages 17; Tuples 1000: Deleted 3000. Elapsed 0/0 sec.
NOTICE: Rel onek: Pages: 98 --> 25; Tuple(s) moved: 1000. Elapsed 0/1 sec.
NOTICE: Index onek_stringu1: Pages 28; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
NOTICE: Index onek_hundred: Pages 12; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
NOTICE: Index onek_unique2: Pages 19; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
NOTICE: Index onek_unique1: Pages 17; Tuples 1000: Deleted 1000. Elapsed 0/0 sec.
NOTICE: Index onek_unique1: Pages 14; Tuples 1000: Deleted 3000.
CPU 0.00s/0.11u sec elapsed 0.12 sec.
NOTICE: Index onek_unique2: Pages 16; Tuples 1000: Deleted 3000.
CPU 0.00s/0.10u sec elapsed 0.10 sec.
NOTICE: Index onek_hundred: Pages 13; Tuples 1000: Deleted 3000.
CPU 0.00s/0.10u sec elapsed 0.10 sec.
NOTICE: Index onek_stringu1: Pages 31; Tuples 1000: Deleted 3000.
CPU 0.01s/0.09u sec elapsed 0.10 sec.
NOTICE: Removed 3000 tuples in 70 pages.
CPU 0.02s/0.04u sec elapsed 0.07 sec.
NOTICE: Pages 94: Changed 0, Empty 0; Tup 1000: Vac 3000, Keep 0, UnUsed 0.
Total CPU 0.05s/0.45u sec elapsed 0.59 sec.
NOTICE: Analyzing onek
VACUUM
</programlisting>
</para>