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Oracle Database 11gR2 Performance Tuning Cookbook
book

Oracle Database 11gR2 Performance Tuning Cookbook

by Ciro Fiorillo
January 2012
Intermediate to advanced
542 pages
11h 28m
English
Packt Publishing
Content preview from Oracle Database 11gR2 Performance Tuning Cookbook

V$LIBRARYCACHE

Displays statistics on library cache activity.

Fields

The most relevant view fields are:

  • NAMESPACE: The library cache namespace
  • GETS: The number of times a lock was requested for objects in the namespace
  • GETHITRATIO: The number of times the object's handle was found in memory
  • PINS: The number of times a PIN was requested for objects in the namespace
  • PINHITRATIO: The number of times the object's metadata were found in memory
  • RELOADS: Any PIN of the object, following the first after object creation, which requires loading the object from disk
  • INVALIDATIONS: The number of times objects in the namespace were marked invalid due to dependent object modifications
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Publisher Resources

ISBN: 9781849682602Other