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Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/sql-alterdatabase.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>ALTER DATABASE</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-alterconversion.html" title="ALTER CONVERSION" /><link rel="next" href="sql-alterdefaultprivileges.html" title="ALTER DEFAULT PRIVILEGES" /></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">ALTER DATABASE</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-alterconversion.html" title="ALTER CONVERSION">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-alterdefaultprivileges.html" title="ALTER DEFAULT PRIVILEGES">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-ALTERDATABASE"><div class="titlepage"></div><a id="id-1.9.3.7.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">ALTER DATABASE</span></h2><p>ALTER DATABASE — change a database</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">

  3. ALTER DATABASE <em class="replaceable"><code>name</code></em> [ [ WITH ] <em class="replaceable"><code>option</code></em> [ ... ] ]

  4. 

  5. <span class="phrase">where <em class="replaceable"><code>option</code></em> can be:</span>

  6. 

  7.     ALLOW_CONNECTIONS <em class="replaceable"><code>allowconn</code></em>

  8.     CONNECTION LIMIT <em class="replaceable"><code>connlimit</code></em>

  9.     IS_TEMPLATE <em class="replaceable"><code>istemplate</code></em>

  10. 

  11. ALTER DATABASE <em class="replaceable"><code>name</code></em> RENAME TO <em class="replaceable"><code>new_name</code></em>

  12. 

  13. ALTER DATABASE <em class="replaceable"><code>name</code></em> OWNER TO { <em class="replaceable"><code>new_owner</code></em> | CURRENT_USER | SESSION_USER }

  14. 

  15. ALTER DATABASE <em class="replaceable"><code>name</code></em> SET TABLESPACE <em class="replaceable"><code>new_tablespace</code></em>

  16. 

  17. ALTER DATABASE <em class="replaceable"><code>name</code></em> SET <em class="replaceable"><code>configuration_parameter</code></em> { TO | = } { <em class="replaceable"><code>value</code></em> | DEFAULT }

  18. ALTER DATABASE <em class="replaceable"><code>name</code></em> SET <em class="replaceable"><code>configuration_parameter</code></em> FROM CURRENT

  19. ALTER DATABASE <em class="replaceable"><code>name</code></em> RESET <em class="replaceable"><code>configuration_parameter</code></em>

  20. ALTER DATABASE <em class="replaceable"><code>name</code></em> RESET ALL

  21. </pre></div><div class="refsect1" id="id-1.9.3.7.5"><h2>Description</h2><p>

  22.    <code class="command">ALTER DATABASE</code> changes the attributes

  23.    of a database.

  24.   </p><p>

  25.    The first form changes certain per-database settings.  (See below for

  26.    details.)  Only the database owner or a superuser can change these settings.

  27.   </p><p>

  28.    The second form changes the name of the database.  Only the database

  29.    owner or a superuser can rename a database; non-superuser owners must

  30.    also have the

  31.    <code class="literal">CREATEDB</code> privilege.  The current database cannot

  32.    be renamed.  (Connect to a different database if you need to do

  33.    that.)

  34.   </p><p>

  35.    The third form changes the owner of the database.

  36.    To alter the owner, you must own the database and also be a direct or

  37.    indirect member of the new owning role, and you must have the

  38.    <code class="literal">CREATEDB</code> privilege.

  39.    (Note that superusers have all these privileges automatically.)

  40.   </p><p>

  41.    The fourth form changes the default tablespace of the database.

  42.    Only the database owner or a superuser can do this; you must also have

  43.    create privilege for the new tablespace.

  44.    This command physically moves any tables or indexes in the database's old

  45.    default tablespace to the new tablespace.  The new default tablespace

  46.    must be empty for this database, and no one can be connected to

  47.    the database.  Tables and indexes in non-default tablespaces are

  48.    unaffected.

  49.   </p><p>

  50.    The remaining forms change the session default for a run-time

  51.    configuration variable for a <span class="productname">PostgreSQL</span>

  52.    database. Whenever a new session is subsequently started in that

  53.    database, the specified value becomes the session default value.

  54.    The database-specific default overrides whatever setting is present

  55.    in <code class="filename">postgresql.conf</code> or has been received from the

  56.    <code class="command">postgres</code> command line.  Only the database

  57.    owner or a superuser can change the session defaults for a

  58.    database.  Certain variables cannot be set this way, or can only be

  59.    set by a superuser.

  60.   </p></div><div class="refsect1" id="id-1.9.3.7.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>

  61.         The name of the database whose attributes are to be altered.

  62.        </p></dd><dt><span class="term"><em class="replaceable"><code>allowconn</code></em></span></dt><dd><p>

  63.          If false then no one can connect to this database.

  64.         </p></dd><dt><span class="term"><em class="replaceable"><code>connlimit</code></em></span></dt><dd><p>

  65.         How many concurrent connections can be made

  66.         to this database.  -1 means no limit.

  67.        </p></dd><dt><span class="term"><em class="replaceable"><code>istemplate</code></em></span></dt><dd><p>

  68.          If true, then this database can be cloned by any user with <code class="literal">CREATEDB</code>

  69.          privileges; if false, then only superusers or the owner of the

  70.          database can clone it.

  71.         </p></dd><dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt><dd><p>

  72.       The new name of the database.

  73.      </p></dd><dt><span class="term"><em class="replaceable"><code>new_owner</code></em></span></dt><dd><p>

  74.       The new owner of the database.

  75.      </p></dd><dt><span class="term"><em class="replaceable"><code>new_tablespace</code></em></span></dt><dd><p>

  76.       The new default tablespace of the database.

  77.      </p><p>

  78.       This form of the command cannot be executed inside a transaction block.

  79.      </p></dd><dt><span class="term"><em class="replaceable"><code>configuration_parameter</code></em><br /></span><span class="term"><em class="replaceable"><code>value</code></em></span></dt><dd><p>

  80.         Set this database's session default for the specified configuration

  81.         parameter to the given value.  If

  82.         <em class="replaceable"><code>value</code></em> is <code class="literal">DEFAULT</code>

  83.         or, equivalently, <code class="literal">RESET</code> is used, the

  84.         database-specific setting is removed, so the system-wide default

  85.         setting will be inherited in new sessions.  Use <code class="literal">RESET

  86.         ALL</code> to clear all database-specific settings.

  87.         <code class="literal">SET FROM CURRENT</code> saves the session's current value of

  88.         the parameter as the database-specific value.

  89.        </p><p>

  90.         See <a class="xref" href="sql-set.html" title="SET"><span class="refentrytitle">SET</span></a> and <a class="xref" href="runtime-config.html" title="Chapter 19. Server Configuration">Chapter 19</a>

  91.         for more information about allowed parameter names

  92.         and values.

  93.        </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.7.7"><h2>Notes</h2><p>

  94.    It is also possible to tie a session default to a specific role

  95.    rather than to a database; see

  96.    <a class="xref" href="sql-alterrole.html" title="ALTER ROLE"><span class="refentrytitle">ALTER ROLE</span></a>.

  97.    Role-specific settings override database-specific

  98.    ones if there is a conflict.

  99.   </p></div><div class="refsect1" id="id-1.9.3.7.8"><h2>Examples</h2><p>

  100.    To disable index scans by default in the database

  101.    <code class="literal">test</code>:

  102. 

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

  104. ALTER DATABASE test SET enable_indexscan TO off;

  105. </pre></div><div class="refsect1" id="id-1.9.3.7.9"><h2>Compatibility</h2><p>

  106.    The <code class="command">ALTER DATABASE</code> statement is a

  107.    <span class="productname">PostgreSQL</span> extension.

  108.   </p></div><div class="refsect1" id="id-1.9.3.7.10"><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-dropdatabase.html" title="DROP DATABASE"><span class="refentrytitle">DROP DATABASE</span></a>, <a class="xref" href="sql-set.html" title="SET"><span class="refentrytitle">SET</span></a>, <a class="xref" href="sql-createtablespace.html" title="CREATE TABLESPACE"><span class="refentrytitle">CREATE 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-alterconversion.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-alterdefaultprivileges.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ALTER CONVERSION </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ALTER DEFAULT PRIVILEGES</td></tr></table></div></body></html>
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