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1 | | -<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.88 2006/09/1812:11:36 teodor Exp $ --> |
| 1 | +<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.89 2006/09/25 22:12:24 tgl Exp $ --> |
2 | 2 |
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3 | 3 | <chapter Id="runtime-config"> |
4 | 4 | <title>Server Configuration</title> |
@@ -1905,21 +1905,21 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Windows |
1905 | 1905 | <listitem> |
1906 | 1906 | <para> |
1907 | 1907 | Sets the planner's assumption about the effective size of the |
1908 | | - disk cache that is available to a singleindex scan. This is |
| 1908 | + disk cache that is available to a singlequery. This is |
1909 | 1909 | factored into estimates of the cost of using an index; a |
1910 | 1910 | higher value makes it more likely index scans will be used, a |
1911 | 1911 | lower value makes it more likely sequential scans will be |
1912 | 1912 | used. When setting this parameter you should consider both |
1913 | 1913 | <productname>PostgreSQL</productname>'s shared buffers and the |
1914 | 1914 | portion of the kernel's disk cache that will be used for |
1915 | 1915 | <productname>PostgreSQL</productname> data files. Also, take |
1916 | | - into account the expected number of concurrent queriesusing |
1917 | | -different indexes, since they will have to share the available |
| 1916 | + into account the expected number of concurrent querieson different |
| 1917 | +tables, since they will have to share the available |
1918 | 1918 | space. This parameter has no effect on the size of shared |
1919 | 1919 | memory allocated by <productname>PostgreSQL</productname>, nor |
1920 | 1920 | does it reserve kernel disk cache; it is used only for |
1921 | 1921 | estimation purposes. The value is measured in disk pages, |
1922 | | - which are normally 8192 bytes each. The default is1000. |
| 1922 | + which are normally 8192 bytes each. The default is16384 (128 MB). |
1923 | 1923 | </para> |
1924 | 1924 | </listitem> |
1925 | 1925 | </varlistentry> |
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