Query on ALL_TYPE_ATTRS is Very Slow

(Doc ID 1489204.1)

Last updated on JULY 07, 2017

Applies to:

JDBC - Version 11.1.0.7 to 11.2.0.3.0 [Release 11.1 to 11.2]
Information in this document applies to any platform.

Symptoms

Oracle JDBC driver  executes the below query when retrieving metadata information for complex data types.  The execution time of this query is very high and affects performance.

SELECT ATTR_NO, ATTR_NAME, ATTR_TYPE_NAME, ATTR_TYPE_OWNER
FROM ALL_TYPE_ATTRS
WHERE TYPE_NAME IN
(SELECT TABLE_NAME
FROM USER_SYNONYMS START WITH SYNONYM_NAME = :tname CONNECT BY NOCYCLE PRIOR TABLE_NAME = SYNONYM_NAME UNION
SELECT :tname
FROM DUAL) ORDER BY ATTR_NO

Changes

 

Cause

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