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 VACUUMLO(1)                   PostgreSQL 14.0                   VACUUMLO(1)
 PostgreSQL 14.0 Documentation                 PostgreSQL 14.0 Documentation

                                    2021



 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



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 VACUUMLO(1)                   PostgreSQL 14.0                   VACUUMLO(1)
 PostgreSQL 14.0 Documentation                 PostgreSQL 14.0 Documentation

                                    2021



      --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 34.15).

      The environment variable PG_COLOR specifies whether to use color in
      diagnostic messages. Possible values are always, auto and never.

 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



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 VACUUMLO(1)                   PostgreSQL 14.0                   VACUUMLO(1)
 PostgreSQL 14.0 Documentation                 PostgreSQL 14.0 Documentation

                                    2021



      remaining entries in the temporary table identify orphaned LOs. These
      are removed.

 AUTHOR
      Peter Mount <peter@retep.org.uk>















































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