Yogesh Chauhan's Blog


in Postgres on April 6, 2020


CREATE DATABASE creates a new PostgreSQL database.

You can create a database simply by this query:


//You'll see output like this 



Query returned successfully in 1 secs 80 msec.

But that will be a database with default options.

By default, the new database will be created by cloning the standard system database template1.

A different template can be specified by writing TEMPLATE name. In particular, by writing TEMPLATE template0, you can create a virgin database containing only the standard objects predefined by your version of PostgreSQL. This is useful if you wish to avoid copying any installation-local objects that might have been added to template1.

There are ways to create customized database.


    [ [ WITH ] [ OWNER [=] user_name ]
           [ TEMPLATE [=] template ]
           [ ENCODING [=] encoding ]
           [ LC_COLLATE [=] lc_collate ]
           [ LC_CTYPE [=] lc_ctype ]
           [ TABLESPACE [=] tablespace ]
           [ CONNECTION LIMIT [=] connlimit ] ]

Parameters in the syntax above

name: The name of a database to create.

user_name: The role name of the user who will own the new database, or DEFAULT to use the default (namely, the user executing the command).

To create a database owned by another role, you must be a direct or indirect member of that role, or be a superuser.

template: The name of the template from which to create the new database, or DEFAULT to use the default template (template1).

encoding: Character set encoding to use in the new database. Specify a string constant (e.g., ‘SQL_ASCII’), or an integer encoding number, or DEFAULT to use the default encoding (namely, the encoding of the template database). The character sets supported by the PostgreSQL server are described HERE.

lc_collate: Collation order (LC_COLLATE) to use in the new database. This affects the sort order applied to strings, e.g. in queries with ORDER BY, as well as the order used in indexes on text columns.

The default is to use the collation order of the template database. 

lc_ctype: Character classification (LC_CTYPE) to use in the new database. This affects the categorization of characters, e.g. lower, upper and digit.

The default is to use the character classification of the template database. 

tablespace: The name of the tablespace that will be associated with the new database, or DEFAULT to use the template database’s tablespace.

This tablespace will be the default tablespace used for objects created in this database. 

connlimit: How many concurrent connections can be made to this database. -1 (the default) means no limit.

CREATE DATABASE cannot be executed inside a transaction block.

More Examples

To create a database sales owned by user salesapp with a default tablespace of salesspace:

CREATE DATABASE sales OWNER salesapp TABLESPACE salesspace;

To create a database music which supports the ISO-8859-1 character set:


In this example, the TEMPLATE template0 clause would only be required if template1’s encoding is not ISO-8859-1. Note that changing encoding might require selecting new LC_COLLATE and LC_CTYPE settings as well.

Errors along the line of “could not initialize database directory” are most likely related to insufficient permissions on the data directory, a full disk, or other file system problems.

Although it is possible to copy a database other than template1 by specifying its name as the template, this is not (yet) intended as a general-purpose “COPY DATABASE” facility.

The principal limitation is that no other sessions can be connected to the template database while it is being copied.

CREATE DATABASE will fail if any other connection exists when it starts; otherwise, new connections to the template database are locked out until CREATE DATABASE completes. For more info CLICK HERE

The character set encoding specified for the new database must be compatible with the chosen locale settings (LC_COLLATE and LC_CTYPE).

If the locale is C (or equivalently POSIX), then all encodings are allowed, but for other locale settings there is only one encoding that will work properly. (On Windows, however, UTF-8 encoding can be used with any locale.)

CREATE DATABASE will allow superusers to specify SQL_ASCII encoding regardless of the locale settings, but this choice is deprecated and may result in misbehavior of character-string functions if data that is not encoding-compatible with the locale is stored in the database.

The encoding and locale settings must match those of the template database, except when template0 is used as template.

This is because other databases might contain data that does not match the specified encoding, or might contain indexes whose sort ordering is affected by LC_COLLATE and LC_CTYPE.

Copying such data would result in a database that is corrupt according to the new settings. template0, however, is known to not contain any data or indexes that would be affected.

The CONNECTION LIMIT option is only enforced approximately; if two new sessions start at about the same time when just one connection “slot” remains for the database, it is possible that both will fail.

Also, the limit is not enforced against superusers.

Credit: Postgres Official Docs

Most Read

#1 Solution to the error “Visual Studio Code can’t be opened because Apple cannot check it for malicious software” #2 How to add Read More Read Less Button using JavaScript? #3 How to check if radio button is checked or not using JavaScript? #4 Solution to “TypeError: ‘x’ is not iterable” in Angular 9 #5 PHP Login System using PDO Part 1: Create User Registration Page #6 How to uninstall Cocoapods from the Mac OS?

Recently Posted

#Apr 8 JSON.stringify() in JavaScript #Apr 7 Middleware in NextJS #Jan 17 4 advanced ways to search Colleague #Jan 16 Colleague UI Basics: The Search Area #Jan 16 Colleague UI Basics: The Context Area #Jan 16 Colleague UI Basics: Accessing the user interface
You might also like these
Why do we need HAVING Clause in SQL?SQL/MySQLSolution to the error “Visual Studio Code can’t be opened because Apple cannot check it for malicious software”MiscellaneousHow to find the HCF or GCD and LCM of two given numbers using Swift?SwiftDoes :is() pseudo selector hint at CSS preprocessing in the future?CSSCheck If a String Contains a Specific Word in PHPPHPUseful (and probably ignored) HTML tags: Part 2HTML