Should I use DB_INIT_CDB while open DB_ENV(multiple writer and reader)?

My version is db-4.7.25.NC
I want to use BDB as backend for BBS, so multiple writer and multiple reader are not avoidable.
My question is what flags I should select while open DB_ENV and DB, DB_THREAD or else?
DB_INIT_CDB can support only writer thread, I wonder it could meet my requirement?
Any suggestion, welcom!
Edited by: user11335524 on Jun 30, 2009 11:37 PM

The <tt>DB_INIT_CDB</tt> flag only permits one writer <i>at a time</i>. Berkeley DB uses locking internally to enforce this constraint, so if two application threads try to update at the same time, one of them will wait for the other. The <tt>DB_THREAD</tt> flag is required if multiple threads will share the same <tt>DB_ENV</tt> or <tt>DB</tt> handle.
Regards,
Michael Cahill, Oracle Berkeley DB.

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