There seems to be a bug in "db_driverkey", when OpenACS connects to multiple databases [1]. The situation with "db_driverkey" is complicated by the fact that this function is sometimes called with a database name in its argument "dbn", and sometimes with a database handle. This is something to look at in the future.
The new version removes the per-thread caching, which was introduced to reduce the high number of mutex locks caused in busy machines. The new version is better by a factor of 2 than older versions, but relies on NaviServer.
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