Release 3.1: DB_SYSTEM_MEM
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## Release 3.1: DB_SYSTEM_MEM

Using the DB_SYSTEM_MEM option on UNIX systems now requires the specification of a base system memory segment ID, using the DB_ENV->set_shm_key() method. Any valid segment ID may be specified, for example, one returned by the UNIX `ftok`(3) function.

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