PEGA0017 alert: Cache exceeds limit

The PEGA0017 alert is triggered when a cache size exceeds the limit value and indicates that the instances of the stated cache are being invalidated (purged).

Like the PEGA0016 alert, this setting relates to various caches in the system. When entries stored in a cache exceed the limit value (not the target value) set in Data-Admin-System-Settings (DASS), the oldest entries in the cache are immediately invalidated until the count of entries in the cache is below the target limit. The alert message specifies which of the following caches was affected:

  • fua/global
  • fua/personal
  • PropertyReference
  • LowerCase
  • UpperCase

Example message text

collections/mru/UpperCase: Successfully reduced MRU by 3002 down to: 15000.

Default settings

fua/global/instancecountlimit - 20000

fua/personal/instancecountlimit - 20000

collections/mru/PropertyReference/instancecountlimit - 10000

collections/mru/LowerCase/instancecountlimit - 10000

collections/mru/UpperCase/instancecountlimit - 15000

Probable reasons for the alert and next steps

When this alert occurs, it is a strong indication that the cache limit setting is too low.

A cache that is too small hurts performance by requiring more objects to be fetched from the database (or fetched from the file system or loaded by a class loader) than from the cache.

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