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Commitb344b87

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Add missing documentation for effective_io_concurrency tablespace option.
The description of effective_io_concurrency option was missing in ALTERTABLESPACE 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
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‎doc/src/sgml/ref/alter_tablespace.sgml‎

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@@ -83,14 +83,15 @@ ALTER TABLESPACE <replaceable>name</replaceable> RESET ( <replaceable class="PAR
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<listitem>
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<para>
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A tablespace parameter to be set or reset. Currently, the only
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available parameters are <varname>seq_page_cost</> and
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<varname>random_page_cost</>. Setting either value for a particular
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tablespace will override the planner's usual estimate of the cost of
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reading pages from tables in that tablespace, as established by
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the configuration parameters of the same name (see
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<xref linkend="guc-seq-page-cost">,
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<xref linkend="guc-random-page-cost">). This may be useful if one
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tablespace is located on a disk which is faster or slower than the
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available parameters are <varname>seq_page_cost</>,
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<varname>random_page_cost</> and <varname>effective_io_concurrency</>.
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Setting either value for a particular tablespace will override the
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planner's usual estimate of the cost of reading pages from tables in
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that tablespace, as established by the configuration parameters of the
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same name (see <xref linkend="guc-seq-page-cost">,
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<xref linkend="guc-random-page-cost">,
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<xref linkend="guc-effective-io-concurrency">). This may be useful if
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one tablespace is located on a disk which is faster or slower than the
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remainder of the I/O subsystem.
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</para>
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</listitem>

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