Some Questions About Behaviour of Indexes in Coherence

(Doc ID 780555.1)

Last updated on JULY 09, 2017

Applies to:

Oracle Coherence - Version: 3.4.0 to 3.7.0 - Release: to AS10g
Information in this document applies to any platform.


  1. Can Coherence Indexes (as created by addIndex) 'overflow' to disk?
  2. Can an object be excluded from an index (e.g. if making ValueExtractor to return null)?
  3. How scalable are indexes? What is the expected performance?
  4. What is the space used by an index? (Is it a function of number of entries, how sparse the data is?)
  5. Could the index space possibly be calculated by a formula, like:
         number of entries * (200 bytes + the size of value returned by ValueExtractor)?


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