How to avoid this very heavy query that slows down the application?
- by Juan Paredes
Hi,
We have a web application running in a production enviroment and at some point the client complained about how slow the application got.
When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting an extremely high load on the database server):
SELECT NULL AS table_cat,
o.owner AS table_schem,
o.object_name AS table_name,
o.object_type AS table_type,
NULL AS remarks
FROM all_objects o
WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND
o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND
o.object_type IN(:"SYS_B_2", :"SYS_B_3")
ORDER BY table_type, table_schem, table_name
Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help in how to avoid it very much appreciated!
The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10.1.0.4, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga, connection pool library C3P0 version 0.9.1.
Thank you.
