|The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference
by The PostgreSQL Global Development Group
Paperback (6"x9"), 488 pages
RRP £14.95 ($19.95)
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vacuumdb -- garbage-collect and analyze a PostgreSQL database
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]
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
There is no effective difference between vacuuming and analyzing
databases via this utility and via other methods for accessing the
vacuumdb accepts the following command-line arguments:
- Vacuum all databases.
Specifies the name of the database to be cleaned or analyzed.
If this is not specified and
--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.
- Echo the commands that vacuumdb generates and sends to the server.
- Perform “full” vacuuming.
- Aggressively “freeze” tuples.
- 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
Tip: If you specify columns, you probably have to escape the parentheses from the shell. (See examples below.)
- Print detailed information during processing.
- Print the vacuumdb version and exit.
- Also calculate statistics for use by the optimizer.
- Only calculate statistics for use by the optimizer (no vacuum).
- Show help about vacuumdb command line arguments, and exit.
vacuumdb also accepts the following command-line arguments for connection parameters:
- 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.
- Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
- User name to connect as.
- 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.
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
-Wto avoid the extra connection attempt.
- Default connection parameters
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Volume 2: Environment Variables).
In case of difficulty, see
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.
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 Volume 2: The Password File for more information.
To clean the database
$ vacuumdb test
To clean and analyze for the optimizer a database named
$ 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
|ISBN 9781906966058||The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference||See the print edition|