Oracle8i internal services for waits, latches, locks and by Steve Adams

By Steve Adams

Definite, the ebook was once written while Oracle 8i used to be round, however it is easily definitely worth the learn even today.

Adams is aware how Oracle works and explains the waits, latches and locks pretty much. I in particular loved the bankruptcy on reminiscence.

I discovered much from this ebook. This was once cash good spent.

Highly instructed.

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Additional info for Oracle8i internal services for waits, latches, locks and memory

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That slot, in turn, holds a pointer to the next free slot in the free list, and so on. Free slots are always taken from the head of the free list, and are always returned to the head of the free list. This means that the tail of the free list normally remains unused, and the high-water mark is only advanced when necessary. sql under Oracle7 to extract the maximum usage of each fixed array from the corresponding X$ tables. This script is redundant in Oracle8, because the same functionality is now provided by the V$RESOURCE_LIMIT view.

1, the Distributed Lock Manager (DLM) latching statistics have been merged into V$LATCH. LMON performs latch cleanup for DLM latches in cooperation with PMON. 4 Advanced Latching Control Some operating systems support a facility called multi-processing control. This enables an authorized user process to influence its CPU scheduling in a variety of ways. Where available, Oracle can use certain multi-processing control features. The following features affect the latching mechanism. 1 Preemption Control Preemption control enables Oracle to suspend the operation of the normal operating system process preemption mechanism during performance-critical operations—in particular, when holding a latch.

Otherwise, runnable processes will not be migrated to idle CPUs. Oracle can use multi-processing control features to improve the performance of large, highly active instances significantly, and the biggest impact is in the area of latching. " Where these features are available, the "oracle" user must be specifically authorized to use them. In some cases, such authorizations are not persistent, and so the authorization commands must be placed in the system startup scripts to ensure that Oracle will always be able to use these features.

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