VACUUMLO(1)                       PostgreSQL 12.3 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
       --limit=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
       --dry-run
           Don't remove anything, just show what would be done.

       -v
       --verbose
           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 host
       --host=host
           Database server's host.

       -p port
       --port=port
           Database server's port.

       -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 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.

ENVIRONMENT
       PGHOST
       PGPORT
       PGUSER
           Default connection parameters.

       This utility, like most other PostgreSQL utilities, also uses the environment variables
       supported by libpq (see Section 33.14).

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 AT retep.uk>



PostgreSQL 12.3                                2020                                   VACUUMLO(1)