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Add missing documentation for effective_io_concurrency tablespace option. 

The description of effective_io_concurrency option was missing in ALTER
TABLESPACE docs though it's included in CREATE TABLESPACE one.

Back-patch to 9.6 where effective_io_concurrency tablespace option was added.

Michael Paquier, reported by Marc-Olaf Jaschke
This commit is contained in:
Fujii Masao 2016-12-17 01:25:29 +09:00
parent b81b5a96f4
commit 4e344c2cf4
1 changed files with 9 additions and 8 deletions
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17
doc/src/sgml/ref/alter_tablespace.sgml
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@ -83,14 +83,15 @@ ALTER TABLESPACE <replaceable>name</replaceable> RESET ( <replaceable class="PAR
<listitem> <listitem>
<para> <para>
A tablespace parameter to be set or reset. Currently, the only A tablespace parameter to be set or reset. Currently, the only
available parameters are <varname>seq_page_cost</> and available parameters are <varname>seq_page_cost</>,
<varname>random_page_cost</>. Setting either value for a particular <varname>random_page_cost</> and <varname>effective_io_concurrency</>.
tablespace will override the planner's usual estimate of the cost of Setting either value for a particular tablespace will override the
reading pages from tables in that tablespace, as established by planner's usual estimate of the cost of reading pages from tables in
the configuration parameters of the same name (see that tablespace, as established by the configuration parameters of the
<xref linkend="guc-seq-page-cost">, same name (see <xref linkend="guc-seq-page-cost">,
<xref linkend="guc-random-page-cost">). This may be useful if one <xref linkend="guc-random-page-cost">,
tablespace is located on a disk which is faster or slower than the <xref linkend="guc-effective-io-concurrency">). This may be useful if
one tablespace is located on a disk which is faster or slower than the
remainder of the I/O subsystem. remainder of the I/O subsystem.
</para> </para>
</listitem> </listitem>