1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
'\" t
.\" Title: ALTER DATABASE
.\" Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 2024
.\" Manual: PostgreSQL 15.7 Documentation
.\" Source: PostgreSQL 15.7
.\" Language: English
.\"
.TH "ALTER DATABASE" "7" "2024" "PostgreSQL 15.7" "PostgreSQL 15.7 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
ALTER_DATABASE \- change a database
.SH "SYNOPSIS"
.sp
.nf
ALTER DATABASE \fIname\fR [ [ WITH ] \fIoption\fR [ \&.\&.\&. ] ]
where \fIoption\fR can be:
ALLOW_CONNECTIONS \fIallowconn\fR
CONNECTION LIMIT \fIconnlimit\fR
IS_TEMPLATE \fIistemplate\fR
ALTER DATABASE \fIname\fR RENAME TO \fInew_name\fR
ALTER DATABASE \fIname\fR OWNER TO { \fInew_owner\fR | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER DATABASE \fIname\fR SET TABLESPACE \fInew_tablespace\fR
ALTER DATABASE \fIname\fR REFRESH COLLATION VERSION
ALTER DATABASE \fIname\fR SET \fIconfiguration_parameter\fR { TO | = } { \fIvalue\fR | DEFAULT }
ALTER DATABASE \fIname\fR SET \fIconfiguration_parameter\fR FROM CURRENT
ALTER DATABASE \fIname\fR RESET \fIconfiguration_parameter\fR
ALTER DATABASE \fIname\fR RESET ALL
.fi
.SH "DESCRIPTION"
.PP
\fBALTER DATABASE\fR
changes the attributes of a database\&.
.PP
The first form changes certain per\-database settings\&. (See below for details\&.) Only the database owner or a superuser can change these settings\&.
.PP
The second form changes the name of the database\&. Only the database owner or a superuser can rename a database; non\-superuser owners must also have the
CREATEDB
privilege\&. The current database cannot be renamed\&. (Connect to a different database if you need to do that\&.)
.PP
The third form changes the owner of the database\&. To alter the owner, you must own the database and also be a direct or indirect member of the new owning role, and you must have the
CREATEDB
privilege\&. (Note that superusers have all these privileges automatically\&.)
.PP
The fourth form changes the default tablespace of the database\&. Only the database owner or a superuser can do this; you must also have create privilege for the new tablespace\&. This command physically moves any tables or indexes in the database\*(Aqs old default tablespace to the new tablespace\&. The new default tablespace must be empty for this database, and no one can be connected to the database\&. Tables and indexes in non\-default tablespaces are unaffected\&.
.PP
The remaining forms change the session default for a run\-time configuration variable for a
PostgreSQL
database\&. Whenever a new session is subsequently started in that database, the specified value becomes the session default value\&. The database\-specific default overrides whatever setting is present in
postgresql\&.conf
or has been received from the
\fBpostgres\fR
command line\&. Only the database owner or a superuser can change the session defaults for a database\&. Certain variables cannot be set this way, or can only be set by a superuser\&.
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name of the database whose attributes are to be altered\&.
.RE
.PP
\fIallowconn\fR
.RS 4
If false then no one can connect to this database\&.
.RE
.PP
\fIconnlimit\fR
.RS 4
How many concurrent connections can be made to this database\&. \-1 means no limit\&.
.RE
.PP
\fIistemplate\fR
.RS 4
If true, then this database can be cloned by any user with
CREATEDB
privileges; if false, then only superusers or the owner of the database can clone it\&.
.RE
.PP
\fInew_name\fR
.RS 4
The new name of the database\&.
.RE
.PP
\fInew_owner\fR
.RS 4
The new owner of the database\&.
.RE
.PP
\fInew_tablespace\fR
.RS 4
The new default tablespace of the database\&.
.sp
This form of the command cannot be executed inside a transaction block\&.
.RE
.PP
REFRESH COLLATION VERSION
.RS 4
Update the database collation version\&. See
Notes
for background\&.
.RE
.PP
\fIconfiguration_parameter\fR
.br
\fIvalue\fR
.RS 4
Set this database\*(Aqs session default for the specified configuration parameter to the given value\&. If
\fIvalue\fR
is
DEFAULT
or, equivalently,
RESET
is used, the database\-specific setting is removed, so the system\-wide default setting will be inherited in new sessions\&. Use
RESET ALL
to clear all database\-specific settings\&.
SET FROM CURRENT
saves the session\*(Aqs current value of the parameter as the database\-specific value\&.
.sp
See
\fBSET\fR(7)
and
Chapter\ \&20
for more information about allowed parameter names and values\&.
.RE
.SH "NOTES"
.PP
It is also possible to tie a session default to a specific role rather than to a database; see
ALTER ROLE (\fBALTER_ROLE\fR(7))\&. Role\-specific settings override database\-specific ones if there is a conflict\&.
.SH "EXAMPLES"
.PP
To disable index scans by default in the database
test:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DATABASE test SET enable_indexscan TO off;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
The
\fBALTER DATABASE\fR
statement is a
PostgreSQL
extension\&.
.SH "SEE ALSO"
CREATE DATABASE (\fBCREATE_DATABASE\fR(7)), DROP DATABASE (\fBDROP_DATABASE\fR(7)), \fBSET\fR(7), CREATE TABLESPACE (\fBCREATE_TABLESPACE\fR(7))
|
