Open

   Syntax: open database-name [huge|long|short]

   The OPEN command opens an alias database after first closing
   any currently opened database. If the database to be opened
   already exists, then DB will automatically determine whether
   or not the database is a "huge" (stores 80/1024 character long
   alias names/values), or "long" (stores 80/132 character long
   alias names/values) or "short" (stores 32/80 character long alias
   names/values). If the database does not already exist, then it
   will be created. If the SHORT, LONG, or HUGE keyword is specified
   after the database file name, then the database created will be
   of that type. If no keyword is specified, the created database
   will be a long database.

   When DB is first invoked, the personal alias database pointed
   at by the logical PMDF_PERSONAL_ALIAS_DATABASE is automatically
   opened. If it doesn't exist, a long database is automatically
   created. Note that because of this, if you want a huge or short
   database instead of a long one, you must create a database file
   of the desired size either (e.g. for a huge database) using "pmdf
   crdb/huge", or by using the DB "open other-file huge" command
   then renaming other-file to the PMDF_PERSONAL_ALIAS_DATABASE
   name.