VACUUMLO(1)						  PostgreSQL 9.2.7 Documentation					       VACUUMLO(1)

NAME

       vacuumlo - remove orphaned large objects from a PostgreSQL database

SYNOPSIS

       vacuumlo [option...] dbname...

DESCRIPTION

       vacuumlo is a simple utility program that will remove any "orphaned" large objects from a PostgreSQL database. An orphaned large object
       (LO) is considered to be any LO whose OID does not appear in any oid or lo data column of the database.

       If you use this, you may also be interested in the lo_manage trigger in the lo module.  lo_manage is useful to try to avoid creating
       orphaned LOs in the first place.

       All databases named on the command line are processed.

OPTIONS

       vacuumlo accepts the following command-line arguments:

       -l limit
	   Remove no more than limit large objects per transaction (default 1000). Since the server acquires a lock per LO removed, removing too
	   many LOs in one transaction risks exceeding max_locks_per_transaction. Set the limit to zero if you want all removals done in a single
	   transaction.

       -n
	   Don't remove anything, just show what would be done.

       -v
	   Write a lot of progress messages.

       -V, --version
	   Print the vacuumlo version and exit.

       -?, --help
	   Show help about vacuumlo command line arguments, and exit.

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

       -h hostname
	   Database server's host.

       -p port
	   Database server's port.

       -U 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
	   Force vacuumlo to prompt for a password before connecting to a database.

	   This option is never essential, since vacuumlo will automatically prompt for a password if the server demands password authentication.
	   However, vacuumlo 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.

NOTES

       vacuumlo works by the following method: First, vacuumlo builds a temporary table which contains all of the OIDs of the large objects in the
       selected database. It then scans through all columns in the database that are of type oid or lo, and removes matching entries from the
       temporary table. (Note: Only types with these names are considered; in particular, domains over them are not considered.) The remaining
       entries in the temporary table identify orphaned LOs. These are removed.

AUTHOR

       Peter Mount <peter@retep.org.uk>

PostgreSQL 9.2.7						    2014-02-17							       VACUUMLO(1)