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The semantics of joining existing Berkeley DB database environments has changed in the 4.4 release. Previously:
In the 4.4 release, the semantics have been simplified to make it easier to write robust applications. In the 4.4 release:
In other words, the choice of subsystems initialized for a Berkeley DB database environment is specified by the thread of control initially creating the environment. Any subsequent thread of control joining the environment will automatically be configured to use the same subsystems as were created in the environment (unless the thread of control requests a subsystem not available in the environment, which will fail). Applications joining an environment, able to adapt to whatever subsystems have been configured in the environment, should open the environment without specifying any subsystem flags. Applications joining an environment, requiring specific subsystems from their environments, should open the environment specifying those specific subsystem flags.
The DB_JOINENV flag has been changed to have no effect in the Berkeley DB 4.4 release. Applications should require no changes, although uses of the DB_JOINENV flag may be removed.
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