EVOLUTION-MANAGER

Edit File: CREATE_TABLESPACE.7

'\" t .\" Title: CREATE TABLESPACE .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> .\" Date: 2025 .\" Manual: PostgreSQL 14.18 Documentation .\" Source: PostgreSQL 14.18 .\" Language: English .\" .TH "CREATE TABLESPACE" "7" "2025" "PostgreSQL 14.18" "PostgreSQL 14.18 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" CREATE_TABLESPACE \- define a new tablespace .SH "SYNOPSIS" .sp .nf CREATE TABLESPACE \fItablespace_name\fR [ OWNER { \fInew_owner\fR | CURRENT_ROLE | CURRENT_USER | SESSION_USER } ] LOCATION \*(Aq\fIdirectory\fR\*(Aq [ WITH ( \fItablespace_option\fR = \fIvalue\fR [, \&.\&.\&. ] ) ] .fi .SH "DESCRIPTION" .PP \fBCREATE TABLESPACE\fR registers a new cluster\-wide tablespace\&. The tablespace name must be distinct from the name of any existing tablespace in the database cluster\&. .PP A tablespace allows superusers to define an alternative location on the file system where the data files containing database objects (such as tables and indexes) can reside\&. .PP A user with appropriate privileges can pass \fItablespace_name\fR to \fBCREATE DATABASE\fR, \fBCREATE TABLE\fR, \fBCREATE INDEX\fR or \fBADD CONSTRAINT\fR to have the data files for these objects stored within the specified tablespace\&. .if n \{\ .sp .\} .RS 4 .it 1 an-trap .nr an-no-space-flag 1 .nr an-break-flag 1 .br .ps +1 \fBWarning\fR .ps -1 .br .PP A tablespace cannot be used independently of the cluster in which it is defined; see Section\ \&23.6\&. .sp .5v .RE .SH "PARAMETERS" .PP \fItablespace_name\fR .RS 4 The name of a tablespace to be created\&. The name cannot begin with pg_, as such names are reserved for system tablespaces\&. .RE .PP \fIuser_name\fR .RS 4 The name of the user who will own the tablespace\&. If omitted, defaults to the user executing the command\&. Only superusers can create tablespaces, but they can assign ownership of tablespaces to non\-superusers\&. .RE .PP \fIdirectory\fR .RS 4 The directory that will be used for the tablespace\&. The directory must exist (\fBCREATE TABLESPACE\fR will not create it), should be empty, and must be owned by the PostgreSQL system user\&. The directory must be specified by an absolute path name\&. .RE .PP \fItablespace_option\fR .RS 4 A tablespace parameter to be set or reset\&. Currently, the only available parameters are \fIseq_page_cost\fR, \fIrandom_page_cost\fR, \fIeffective_io_concurrency\fR and \fImaintenance_io_concurrency\fR\&. Setting these values for a particular tablespace will override the planner\*(Aqs usual estimate of the cost of reading pages from tables in that tablespace, and the executor\*(Aqs prefetching behavior, as established by the configuration parameters of the same name (see seq_page_cost, random_page_cost, effective_io_concurrency, maintenance_io_concurrency)\&. 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\&. .RE .SH "NOTES" .PP Tablespaces are only supported on systems that support symbolic links\&. .PP \fBCREATE TABLESPACE\fR cannot be executed inside a transaction block\&. .SH "EXAMPLES" .PP To create a tablespace dbspace at file system location /data/dbs, first create the directory using operating system facilities and set the correct ownership: .sp .if n \{\ .RS 4 .\} .nf mkdir /data/dbs chown postgres:postgres /data/dbs .fi .if n \{\ .RE .\} .sp Then issue the tablespace creation command inside PostgreSQL: .sp .if n \{\ .RS 4 .\} .nf CREATE TABLESPACE dbspace LOCATION \*(Aq/data/dbs\*(Aq; .fi .if n \{\ .RE .\} .PP To create a tablespace owned by a different database user, use a command like this: .sp .if n \{\ .RS 4 .\} .nf CREATE TABLESPACE indexspace OWNER genevieve LOCATION \*(Aq/data/indexes\*(Aq; .fi .if n \{\ .RE .\} .SH "COMPATIBILITY" .PP \fBCREATE TABLESPACE\fR is a PostgreSQL extension\&. .SH "SEE ALSO" CREATE DATABASE (\fBCREATE_DATABASE\fR(7)), CREATE TABLE (\fBCREATE_TABLE\fR(7)), CREATE INDEX (\fBCREATE_INDEX\fR(7)), DROP TABLESPACE (\fBDROP_TABLESPACE\fR(7)), ALTER TABLESPACE (\fBALTER_TABLESPACE\fR(7))