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back-bdb concurrency

This is a minor point, don't know if anyone else has run across it. Just a
warning, if nothing else.

With shared locks in BDB, it has been possible for multiple processes to
operate on the same database at once. I frequently took advantage of this
running slapadd while slapd is running. But with IDL caching in the current
back-bdb, this is no longer advisable for slapadd, as there is no means in
slapd to detect that the underlying IDLs have changed. slapcat is still

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support