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Slow Performance With NVL or NVL2 Referencing PL/SQL Function Even When Ignoring the Function's Result (Doc ID 2093132.1)

Last updated on NOVEMBER 27, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

A SQL query calls a PL/SQL function protected by NVL or NVL2, where the first argument value is such that the argument containing the PL/SQL function should be ignored:

Following is sample testcase:

  
The user-defined function is called even though its result is not needed, causing slow response time.

Cause

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In this Document
Symptoms
Cause
Solution


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