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createdb -- create a database
createdb [-a system] [-h host]
[-p port] [dbname]
Createdb creates a new database. The person
who executes this command becomes the database administrator, or DBA,
for this database and is the only person, other than the Postgres super-user,
who can destroy it.
Createdb is a shell script that invokes psql. Hence,
a postmaster process must be running on the database server host before
createdb is executed. In addition, the PGOPTION
and PGREALM
environment
variables will be passed on to psql and processed as described in psql(1)
.
The optional argument dbname specifies the name of the database to be
created. The name must be unique among all Postgres databases. Dbname defaults
to the value of the USER
environment variable.
Createdb understands the
following command-line options:
- -a system
- Specifies an authentication system
system (see pgintro(1)
) to use in connecting to the postmaster process.
The default is site-specific.
- -h host
- Specifies the hostname of the machine
on which the postmaster is running. Defaults to the name of the local
host, or the value of the PGHOST
environment variable (if set).
- -p port
- Specifies the Internet TCP port on which the postmaster is listening
for connections. Defaults to 5432, or the value of the PGPORT
environment
variable (if set).
# create 5432 demo database
createdb demo
# create the demo database using the postmaster on host eden,
# port
using the Kerberos authentication system.
createdb -a kerberos -p 5432 -h
eden demo
- $PGDATA/base/dbname
- The location of the files corresponding
to the database dbname.
createdb(l)
, destroydb(1)
, initdb(1)
,
psql(1)
, postmaster(1)
.
- Error: Failed to connect to backend
(host=xxx, port=xxx)
- Createdb could not attach to the postmaster process
on the specified host and port. If you see this message, ensure that the
postmaster is running on the proper host and that you have specified the
proper port. If your site uses an authentication system, ensure that you
have obtained the required authentication credentials.
- user `username' is
not in `pg_user'
- You do not have a valid entry in the relation `pg_user'
and cannot do anything with Postgres at all; contact your Postgres site
administrator.
- user `username' is not allowed to create/destroy databases
- You do not have permission to create new databases; contact your Postgres
site administrator.
- dbname already exists
- The database already exists.
- database creation failed on dbname
- An internal error occurred in psql
or the backend server. Ensure that your Postgres site administrator has
properly installed Postgres and initialized the site with initdb.
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