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Learn about Oracle latches

Oracle guru Craig Shallahamer has just published a Plain English description of Oracle latch usage:,289483,sid41_gci1068105,00.html?track=NL-93&ad=508025


We have all heard that it doesn't make sense to have more latches than the number of CPUs. Why? Because you can never use more latches simultaneously than the number of CPUs. While this appears to make perfect sense, it conceals a hidden lie. And here's why...


The thrust of the article is to have more CBC latches than CPU’s on your Oracle server:


Because with more latches, there is an increased likelihood that the latch you must get is available, because that latch is protecting fewer chains. In fact, the general solution is not based upon the number CPUs at all. The idea is to reduce the chances that more than one process will request the same latch.


So while Oracle processes may never ask for more CBC latches than there are CPUs, it is a very good idea to have more CBC latches than CPUs.


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