Oracle8i Internal Services for Waits, Latches, Locks, and Memory (Paperback) by Steve Adams ISBN: 156592598X Steve seems to indicate that these are layers (if I interpret him correctly), locks can be broken (if ddl modifies the object), but only if the object is not pinned, an pinning takes place during a compile, parse, or exec. On Thu, Jan 19, 2006 at 04:18:17PM -0500, Paul Baumgartel wrote: > Can someone on the list explain succinctly the difference between a library > cache lock and a library cache pin, and why both of these concurrency > control mechanisms are necessary? > > -- > Paul Baumgartel > paul.baumgartel@xxxxxxxxxxxx -- -- //www.freelists.org/webpage/oracle-l