Performance Degradation When Using RULE Hint With ADT/Collections In JDBC
Last updated on DECEMBER 01, 2017
Applies to:
JDBC - Version 10.2.0.5 to 11.2.0.3.0 [Release 10.2 to 11.2]Information in this document applies to any platform.
***Checked for relevance on 28-Dec-2013***
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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