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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 Vsnapshot" /><link rel="prev" href="sql-alterconversion.html" title="ALTER CONVERSION" /><link rel="next" href="sql-alterdefaultprivileges.html" title="ALTER DEFAULT PRIVILEGES" /></head><body id="docContent" class="container-fluid col-10"><div 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 18.0 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 /></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> [ ... ] ]
5 <span class="phrase">where <em class="replaceable"><code>option</code></em> can be:</span>
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>
11 ALTER DATABASE <em class="replaceable"><code>name</code></em> RENAME TO <em class="replaceable"><code>new_name</code></em>
13 ALTER DATABASE <em class="replaceable"><code>name</code></em> OWNER TO { <em class="replaceable"><code>new_owner</code></em> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
15 ALTER DATABASE <em class="replaceable"><code>name</code></em> SET TABLESPACE <em class="replaceable"><code>new_tablespace</code></em>
17 ALTER DATABASE <em class="replaceable"><code>name</code></em> REFRESH COLLATION VERSION
19 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 }
20 ALTER DATABASE <em class="replaceable"><code>name</code></em> SET <em class="replaceable"><code>configuration_parameter</code></em> FROM CURRENT
21 ALTER DATABASE <em class="replaceable"><code>name</code></em> RESET <em class="replaceable"><code>configuration_parameter</code></em>
22 ALTER DATABASE <em class="replaceable"><code>name</code></em> RESET ALL
23 </pre></div><div class="refsect1" id="id-1.9.3.7.5"><h2>Description</h2><p>
24 <code class="command">ALTER DATABASE</code> changes the attributes
27 The first form changes certain per-database settings. (See below for
28 details.) Only the database owner or a superuser can change these settings.
30 The second form changes the name of the database. Only the database
31 owner or a superuser can rename a database; non-superuser owners must
33 <code class="literal">CREATEDB</code> privilege. The current database cannot
34 be renamed. (Connect to a different database if you need to do
37 The third form changes the owner of the database.
38 To alter the owner, you must be able to <code class="literal">SET ROLE</code> to the
39 new owning role, and you must have the
40 <code class="literal">CREATEDB</code> privilege.
41 (Note that superusers have all these privileges automatically.)
43 The fourth form changes the default tablespace of the database.
44 Only the database owner or a superuser can do this; you must also have
45 create privilege for the new tablespace.
46 This command physically moves any tables or indexes in the database's old
47 default tablespace to the new tablespace. The new default tablespace
48 must be empty for this database, and no one can be connected to
49 the database. Tables and indexes in non-default tablespaces are
50 unaffected. The method used to copy files to the new tablespace
51 is affected by the <a class="xref" href="runtime-config-resource.html#GUC-FILE-COPY-METHOD">file_copy_method</a> setting.
53 The remaining forms change the session default for a run-time
54 configuration variable for a <span class="productname">PostgreSQL</span>
55 database. Whenever a new session is subsequently started in that
56 database, the specified value becomes the session default value.
57 The database-specific default overrides whatever setting is present
58 in <code class="filename">postgresql.conf</code> or has been received from the
59 <code class="command">postgres</code> command line. Only the database
60 owner or a superuser can change the session defaults for a
61 database. Certain variables cannot be set this way, or can only be
63 </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>
64 The name of the database whose attributes are to be altered.
65 </p></dd><dt><span class="term"><em class="replaceable"><code>allowconn</code></em></span></dt><dd><p>
66 If false then no one can connect to this database.
67 </p></dd><dt><span class="term"><em class="replaceable"><code>connlimit</code></em></span></dt><dd><p>
68 How many concurrent connections can be made
69 to this database. -1 means no limit.
70 </p></dd><dt><span class="term"><em class="replaceable"><code>istemplate</code></em></span></dt><dd><p>
71 If true, then this database can be cloned by any user with <code class="literal">CREATEDB</code>
72 privileges; if false, then only superusers or the owner of the
73 database can clone it.
74 </p></dd><dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt><dd><p>
75 The new name of the database.
76 </p></dd><dt><span class="term"><em class="replaceable"><code>new_owner</code></em></span></dt><dd><p>
77 The new owner of the database.
78 </p></dd><dt><span class="term"><em class="replaceable"><code>new_tablespace</code></em></span></dt><dd><p>
79 The new default tablespace of the database.
81 This form of the command cannot be executed inside a transaction block.
82 </p></dd><dt><span class="term"><code class="literal">REFRESH COLLATION VERSION</code></span></dt><dd><p>
83 Update the database collation version. See <a class="xref" href="sql-altercollation.html#SQL-ALTERCOLLATION-NOTES" title="Notes">Notes</a> for background.
84 </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>
85 Set this database's session default for the specified configuration
86 parameter to the given value. If
87 <em class="replaceable"><code>value</code></em> is <code class="literal">DEFAULT</code>
88 or, equivalently, <code class="literal">RESET</code> is used, the
89 database-specific setting is removed, so the system-wide default
90 setting will be inherited in new sessions. Use <code class="literal">RESET
91 ALL</code> to clear all database-specific settings.
92 <code class="literal">SET FROM CURRENT</code> saves the session's current value of
93 the parameter as the database-specific value.
95 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>
96 for more information about allowed parameter names
98 </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.7.7"><h2>Notes</h2><p>
99 It is also possible to tie a session default to a specific role
100 rather than to a database; see
101 <a class="xref" href="sql-alterrole.html" title="ALTER ROLE"><span class="refentrytitle">ALTER ROLE</span></a>.
102 Role-specific settings override database-specific
103 ones if there is a conflict.
104 </p></div><div class="refsect1" id="id-1.9.3.7.8"><h2>Examples</h2><p>
105 To disable index scans by default in the database
106 <code class="literal">test</code>:
108 </p><pre class="programlisting">
109 ALTER DATABASE test SET enable_indexscan TO off;
110 </pre></div><div class="refsect1" id="id-1.9.3.7.9"><h2>Compatibility</h2><p>
111 The <code class="command">ALTER DATABASE</code> statement is a
112 <span class="productname">PostgreSQL</span> extension.
113 </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" title="ALTER CONVERSION">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-alterdefaultprivileges.html" title="ALTER DEFAULT PRIVILEGES">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" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="40%" align="right" valign="top"> ALTER DEFAULT PRIVILEGES</td></tr></table></div></body></html>