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Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/sql-createtablespace.html

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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>CREATE TABLESPACE</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="sql-createtableas.html" title="CREATE TABLE AS" /><link rel="next" href="sql-createtsconfig.html" title="CREATE TEXT SEARCH CONFIGURATION" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CREATE TABLESPACE</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-createtableas.html" title="CREATE TABLE AS">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-createtsconfig.html" title="CREATE TEXT SEARCH CONFIGURATION">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-CREATETABLESPACE"><div class="titlepage"></div><a id="id-1.9.3.87.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CREATE TABLESPACE</span></h2><p>CREATE TABLESPACE — define a new tablespace</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">

  3. CREATE TABLESPACE <em class="replaceable"><code>tablespace_name</code></em>

  4.     [ OWNER { <em class="replaceable"><code>new_owner</code></em> | CURRENT_USER | SESSION_USER } ]

  5.     LOCATION '<em class="replaceable"><code>directory</code></em>'

  6.     [ WITH ( <em class="replaceable"><code>tablespace_option</code></em> = <em class="replaceable"><code>value</code></em> [, ... ] ) ]

  7. </pre></div><div class="refsect1" id="id-1.9.3.87.5"><h2>Description</h2><p>

  8.    <code class="command">CREATE TABLESPACE</code> registers a new cluster-wide

  9.    tablespace.  The tablespace name must be distinct from the name of any

  10.    existing tablespace in the database cluster.

  11.   </p><p>

  12.    A tablespace allows superusers to define an alternative location on

  13.    the file system where the data files containing database objects

  14.    (such as tables and indexes) can reside.

  15.   </p><p>

  16.    A user with appropriate privileges can pass

  17.    <em class="replaceable"><code>tablespace_name</code></em> to

  18.    <code class="command">CREATE DATABASE</code>, <code class="command">CREATE TABLE</code>,

  19.    <code class="command">CREATE INDEX</code> or <code class="command">ADD CONSTRAINT</code> to have the data

  20.    files for these objects stored within the specified tablespace.

  21.   </p><div class="warning"><h3 class="title">Warning</h3><p>

  22.     A tablespace cannot be used independently of the cluster in which it

  23.     is defined;  see <a class="xref" href="manage-ag-tablespaces.html" title="22.6. Tablespaces">Section 22.6</a>.

  24.    </p></div></div><div class="refsect1" id="id-1.9.3.87.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>tablespace_name</code></em></span></dt><dd><p>

  25.         The name of a tablespace to be created.  The name cannot

  26.         begin with <code class="literal">pg_</code>, as such names

  27.         are reserved for system tablespaces.

  28.        </p></dd><dt><span class="term"><em class="replaceable"><code>user_name</code></em></span></dt><dd><p>

  29.         The name of the user who will own the tablespace.  If omitted,

  30.         defaults to the user executing the command.  Only superusers

  31.         can create tablespaces, but they can assign ownership of tablespaces

  32.         to non-superusers.

  33.        </p></dd><dt><span class="term"><em class="replaceable"><code>directory</code></em></span></dt><dd><p>

  34.         The directory that will be used for the tablespace. The directory

  35.         must exist (<code class="command">CREATE TABLESPACE</code> will not create it),

  36.         should be empty, and must be owned by the

  37.         <span class="productname">PostgreSQL</span> system user.  The directory must be

  38.         specified by an absolute path name.

  39.        </p></dd><dt><span class="term"><em class="replaceable"><code>tablespace_option</code></em></span></dt><dd><p>

  40.         A tablespace parameter to be set or reset.  Currently, the only

  41.         available parameters are <code class="varname">seq_page_cost</code>,

  42.         <code class="varname">random_page_cost</code> and <code class="varname">effective_io_concurrency</code>.

  43.         Setting either value for a particular tablespace will override the

  44.         planner's usual estimate of the cost of reading pages from tables in

  45.         that tablespace, as established by the configuration parameters of the

  46.         same name (see <a class="xref" href="runtime-config-query.html#GUC-SEQ-PAGE-COST">seq_page_cost</a>,

  47.         <a class="xref" href="runtime-config-query.html#GUC-RANDOM-PAGE-COST">random_page_cost</a>,

  48.         <a class="xref" href="runtime-config-resource.html#GUC-EFFECTIVE-IO-CONCURRENCY">effective_io_concurrency</a>).  This may be useful if

  49.         one tablespace is located on a disk which is faster or slower than the

  50.         remainder of the I/O subsystem.

  51.        </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.87.7"><h2>Notes</h2><p>

  52.    Tablespaces are only supported on systems that support symbolic links.

  53.   </p><p>

  54.     <code class="command">CREATE TABLESPACE</code> cannot be executed inside a transaction

  55.     block.

  56.    </p></div><div class="refsect1" id="id-1.9.3.87.8"><h2>Examples</h2><p>

  57.    To create a tablespace <code class="literal">dbspace</code> at file system location

  58.    <code class="literal">/data/dbs</code>, first create the directory using operating

  59.    system facilities and set the correct ownership:

  60. </p><pre class="programlisting">

  61. mkdir /data/dbs

  62. chown postgres:postgres /data/dbs

  63. </pre><p>

  64.    Then issue the tablespace creation command inside

  65.    <span class="productname">PostgreSQL</span>:

  66. </p><pre class="programlisting">

  67. CREATE TABLESPACE dbspace LOCATION '/data/dbs';

  68. </pre><p>

  69.   </p><p>

  70.    To create a tablespace owned by a different database user, use a command

  71.    like this:

  72. </p><pre class="programlisting">

  73. CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes';

  74. </pre></div><div class="refsect1" id="id-1.9.3.87.9"><h2>Compatibility</h2><p>

  75.    <code class="command">CREATE TABLESPACE</code> is a <span class="productname">PostgreSQL</span>

  76.    extension.

  77.   </p></div><div class="refsect1" id="id-1.9.3.87.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createdatabase.html" title="CREATE DATABASE"><span class="refentrytitle">CREATE DATABASE</span></a>, <a class="xref" href="sql-createtable.html" title="CREATE TABLE"><span class="refentrytitle">CREATE TABLE</span></a>, <a class="xref" href="sql-createindex.html" title="CREATE INDEX"><span class="refentrytitle">CREATE INDEX</span></a>, <a class="xref" href="sql-droptablespace.html" title="DROP TABLESPACE"><span class="refentrytitle">DROP TABLESPACE</span></a>, <a class="xref" href="sql-altertablespace.html" title="ALTER TABLESPACE"><span class="refentrytitle">ALTER TABLESPACE</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-createtableas.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-createtsconfig.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">CREATE TABLE AS </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> CREATE TEXT SEARCH CONFIGURATION</td></tr></table></div></body></html>
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