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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 3.1: memp_register

An additional argument has been added to the pgin and pgout functions provided to the memp_register function. The application should be searched for any occurrences of memp_register. For each one, if pgin or pgout functions are specified, the pgin and pgout functions should be modified to take an initial argument of a DB_ENV *. This argument is intended to support better error reporting for applications, and may be entirely ignored by the pgin and pgout functions themselves.

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