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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>



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