DSAs on Tru64 UNIX systems support arguments to the CREATE DSA
 directive.  The arguments are as follows:

 Syntax:

         CREATE DSA [FROM MEMORY IMAGE | FROM SNAPSHOT]

 If you use the FROM MEMORY IMAGE argument, the DSA attempts to
 read a memory image file, and returns a DSA Information Tree
 Corrupt error if none is available. The DSA does not attempt
 to read a snapshot file or create a new database. If the DSA
 can find a valid memory image file, it returns a message
 indicating that is has successfully read the memory image file.

 The memory image file contains a copy of the schema. This means
 that the DSA does not read the schema during creation. However,
 the DSA displays a warning message if its copy of the schema
 is not the same as the schema file. If the schema has been
 changed, use the following commands to force the DSA to read it:

   > DELETE DSA TO SNAPSHOT
   > CREATE DSA FROM SNAPSHOT

 If you use the FROM SNAPSHOT argument, the DSA attempts to read
 a snapshot file, as in previous versions, and returns a DSA
 Information Tree Corrupt error if none is available. The DSA does
 not attempt to read a memory image file or create a new database.
 If the DSA can find a valid snapshot file, it returns a message
 indicating that is has successfully read the snapshot file.

 Do not use the FROM SNAPSHOT argument unless a management
 tasks specifically requires it. A snapshot file is
 significantly less efficient than a memory image file, and if
 you create a snapshot file that is more recent than a memory
 image file, you invalidate the memory image file. The FROM
 SNAPSHOT argument is supported for a small number of management
 tasks only. Forcing the DSA to read a new schema is one of those
 tasks.