From a client perspective, assuming you are talking
about DBD::Oracle, there's no arbitrary limit on
concurrent connections. There are system-imposed
limits on number of file descriptors, etc, but that's
not a perl question.
There are settable limits on client connections in
the Oracle database, but again, not a perl question.
As far as locking goes, again, not a perl question.
Oracle supports locking and transactions,
and the DBI interface inherits these capabilities.
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