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vacuumdb
PostgreSQL 9.1.24lts2 Documentation
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vacuumdb

Name

vacuumdb -- garbage-collect and analyze a PostgreSQL database

Synopsis

vacuumdb [connection-option...] [--full | -f] [--freeze | -F] [--verbose | -v] [--analyze | -z] [--analyze-only | -Z] [--table | -t table [( column [,...] )] ] [dbname]

vacuumdb [connection-option...] [--full | -f] [--freeze | -F] [--verbose | -v] [--analyze | -z] [--analyze-only | -Z] [--all | -a]

Description

vacuumdb is a utility for cleaning a PostgreSQL database. vacuumdb will also generate internal statistics used by the PostgreSQL query optimizer.

vacuumdb is a wrapper around the SQL command VACUUM. There is no effective difference between vacuuming and analyzing databases via this utility and via other methods for accessing the server.

Options

vacuumdb accepts the following command-line arguments:

-a
--all

Vacuum all databases.

[-d] dbname
[--dbname=]dbname

Specifies the name of the database to be cleaned or analyzed. If this is not specified and -a (or --all) is not used, the database name is read from the environment variable PGDATABASE. If that is not set, the user name specified for the connection is used.

-e
--echo

Echo the commands that vacuumdb generates and sends to the server.

-f
--full

Perform "full" vacuuming.

-F
--freeze

Aggressively "freeze" tuples.

-q
--quiet

Do not display progress messages.

-t table [ (column [,...]) ]
--table=table [ (column [,...]) ]

Clean or analyze table only. Column names can be specified only in conjunction with the --analyze or --analyze-only options.

Tip: If you specify columns, you probably have to escape the parentheses from the shell. (See examples below.)

-v
--verbose

Print detailed information during processing.

-V
--version

Print the vacuumdb version and exit.

-z
--analyze

Also calculate statistics for use by the optimizer.

-Z
--analyze-only

Only calculate statistics for use by the optimizer (no vacuum).

-?
--help

Show help about vacuumdb command line arguments, and exit.

vacuumdb also accepts the following command-line arguments for connection parameters:

-h host
--host=host

Specifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix domain socket.

-p port
--port=port

Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.

-U username
--username=username

User name to connect as.

-w
--no-password

Never issue a password prompt. If the server requires password authentication and a password is not available by other means such as a .pgpass file, the connection attempt will fail. This option can be useful in batch jobs and scripts where no user is present to enter a password.

-W
--password

Force vacuumdb to prompt for a password before connecting to a database.

This option is never essential, since vacuumdb will automatically prompt for a password if the server demands password authentication. However, vacuumdb will waste a connection attempt finding out that the server wants a password. In some cases it is worth typing -W to avoid the extra connection attempt.

Environment

PGDATABASE
PGHOST
PGPORT
PGUSER

Default connection parameters

This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 31.13).

Diagnostics

In case of difficulty, see VACUUM and psql for discussions of potential problems and error messages. The database server must be running at the targeted host. Also, any default connection settings and environment variables used by the libpq front-end library will apply.

Notes

vacuumdb might need to connect several times to the PostgreSQL server, asking for a password each time. It is convenient to have a ~/.pgpass file in such cases. See Section 31.14 for more information.

Examples

To clean the database test: 

$ vacuumdb test

To clean and analyze for the optimizer a database named bigdb: 

$ vacuumdb --analyze bigdb

To clean a single table foo in a database named xyzzy, and analyze a single column bar of the table for the optimizer: 

$ vacuumdb --analyze --verbose --table 'foo(bar)' xyzzy

See Also

VACUUM
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