Performance Degradation When Using RULE Hint With ADT/Collections In JDBC (Doc ID 1476892.1)

Last updated on JANUARY 04, 2023

Applies to:

Symptoms

ADT/Collections are being used.  
Queries are seen with Rule hint when using JDBC Api Calls on table USER_TYPE_ATTRS, for example:

SELECT /*+RULE*/ATTR_NO, ATTR_NAME, ATTR_TYPE_NAME, ATTR_TYPE_OWNER FROM USER_TYPE_ATTRS WHERE TYPE_NAME IN (SELECT TABLE_NAME FROM ALL_SYNONYMS START WITH SYNONYM_NAME = :1 AND  OWNER = 'PUBLIC' CONNECT BY NOCYCLE PRIOR TABLE_NAME = SYNONYM_NAME AND TABLE_OWNER = OWNER UNION SELECT :2  FROM DUAL) ORDER BY ATTR_NO

Changes

Application makes use of ADT/Collections

Cause

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