RS03580: PERFORMANCE ISSUE WITH THE DECISION ENGINE WHEN A RULE CONDITION USE THE '&&' OPERATOR

Operational Decision Manager for z/OS 8.10.2.2 Fix Pack
IBM Operational Decision Manager V8.10.2.2 Fix Pack
IBM Operational Decision Manager V8.10.4 Download Document
IBM Operational Decision Manager V8.10.4 Mod Pack
IBM Operational Decision Manager for z/OS 8.10.4 Mod Pack

APAR status

• Closed as program error.

Error description

• When a rule contains several '&&' operators in its condition.
  The performance with the Decision Engine are 10 times lower
  than with the Classic Rule Engine. The issue is that the
  condition expression is not optimally distributed because of
  the '&&' operator supposed non commutative.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users working with Decision Engine.                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When a rule contains several '&&' operators in its           *
  * condition. The performance with DE are 10 times lower than   *
  * with CRE. The issue is that the condition expression is not  *
  * optimally distributed because of the '&&' operator supposed  *
  * non commutative.                                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• A new engine property
  "com.ibm.rules.engine.normalization.uncommutativeAndOptimized"
  has been introduced to set how "uncommutative and"operator
  related to rule conditions are normalized in DE, somehow as a
  commutative operator. By default, this property is set to true
  which corresponds to DE behavior.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WDS FOR RULES

• Fixed component ID

  5725B6903

Applicable component levels

• R8A0 PSY

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