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  Oracle Tips by Burleson

Shared Pool Summary

Let’s review what we have seen so far. We have examined reports that show both gross and detailed shared-pool usage and whether or not shared areas are being reused. What can we do with this data? Ideally, we will use the results to size our shared pool properly. I’ll set seven general guidelines for shared-pool sizing:

  • Guideline 1: If gross usage of the shared pool not in an ad hoc environment exceeds 95 percent (rises to 95 percent or greater and stays there), establish a shared-pool size large enough to hold the fixed-size portions, pin reusable packages and procedures, and then increase shared pool by 20 percent increments until usage drops below 90 percent on the average.
     

  • Guideline 2: If the shared pool shows a mixed ad hoc and reuse environment, establish a shared-pool size large enough to hold the fixed-size portions, pin reusable packages, and establish a comfort level above this required level of pool fill, then establish a routine flush cycle to filter nonreusable code from the pool.
     

  • Guideline 3: If the shared pool shows that no reusable SQL is being used, establish a shared pool large enough to hold the fixed-size portions, plus a few megabytes (usually not more than 40), and allow the shared-pool-modified least recently used (LRU) algorithm to manage the pool.


This is an excerpt by Mike Ault’s book “Oracle9i Administration & Management” .  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

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