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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 4.5: Memory Pool API

As part of implementing support for multi-version concurrency control, the DB_MPOOL_DIRTY flag is now specified to the DB_MPOOLFILE->get method instead of DB_MPOOLFILE->put, and the DB_MPOOLFILE->set method has been removed. In addition, a new transaction handle parameter has been added to the DB_MPOOLFILE->get method.

The DB_MPOOL_CLEAN flag is no longer supported.

Applications which use the memory pool API directly should update to the new API in order to use 4.5.

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