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Support ALTER TABLESPACE name SET/RESET ( tablespace_options ).

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This patch only supports seq_page_cost and random_page_cost as parameters,
but it provides the infrastructure to scalably support many more.
In particular, we may want to add support for effective_io_concurrency,
but I'm leaving that as future work for now.

Thanks to Tom Lane for design help and Alvaro Herrera for the review.
This commit is contained in:
Robert Haas
2010-01-05 21:54:00 +00:00
parent 72559b49c0
commit d86d51a958
28 changed files with 588 additions and 101 deletions
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11
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.241 2009/12/25 01:09:31 rhaas Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.242 2010/01/05 21:53:58 rhaas Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -2000,6 +2000,9 @@ archive_command = 'copy "%p" "C:\\server\\archivedir\\%f"' # Windows
<para>
Sets the planner's estimate of the cost of a disk page fetch
that is part of a series of sequential fetches. The default is 1.0.
This value can be overriden for a particular tablespace by setting
the tablespace parameter of the same name
(see <xref linkend="sql-altertablespace">).
</para>
</listitem>
</varlistentry>
@ -2013,6 +2016,12 @@ archive_command = 'copy "%p" "C:\\server\\archivedir\\%f"' # Windows
<para>
Sets the planner's estimate of the cost of a
non-sequentially-fetched disk page. The default is 4.0.
This value can be overriden for a particular tablespace by setting
the tablespace parameter of the same name
(see <xref linkend="sql-altertablespace">).
</para>
<para>
Reducing this value relative to <varname>seq_page_cost</>
will cause the system to prefer index scans; raising it will
make index scans look relatively more expensive. You can raise

22
doc/src/sgml/ref/alter_tablespace.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_tablespace.sgml,v 1.5 2009/09/19 10:23:26 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_tablespace.sgml,v 1.6 2010/01/05 21:53:58 rhaas Exp $
PostgreSQL documentation
-->
@ -23,6 +23,8 @@ PostgreSQL documentation
<synopsis>
ALTER TABLESPACE <replaceable>name</replaceable> RENAME TO <replaceable>new_name</replaceable>
ALTER TABLESPACE <replaceable>name</replaceable> OWNER TO <replaceable>new_owner</replaceable>
ALTER TABLESPACE <replaceable>name</replaceable> SET ( <replaceable class="PARAMETER">tablespace_option</replaceable> = <replaceable class="PARAMETER">value</replaceable> [, ... ] )
ALTER TABLESPACE <replaceable>name</replaceable> RESET ( <replaceable class="PARAMETER">tablespace_option</replaceable> [, ... ] )
</synopsis>
</refsynopsisdiv>
@ -74,6 +76,24 @@ ALTER TABLESPACE <replaceable>name</replaceable> OWNER TO <replaceable>new_owner
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">tablespace_parameter</replaceable></term>
<listitem>
<para>
A tablespace parameter to be set or reset. Currently, the only
available parameters are <varname>seq_page_cost</> and
<varname>random_page_cost</>. Setting either value for a particular
tablespace will override the planner's usual estimate of the cost of
reading pages from tables in that tablespace, as established by
the configuration parameters of the same name (see
<xref linkend="guc-seq-page-cost">,
<xref linkend="guc-random-page-cost">). 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.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>