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Intermittent Poor Performance Retrieving PL/SQL Object Types (Doc ID 1222553.1)

Last updated on FEBRUARY 28, 2023

Applies to:

JDBC - Version to [Release 9.2 to 10.2]
Information in this document applies to any platform.


When using the JDBC Thin driver to invoke PL/SQL packages that return results as PL/SQL objects, intermittently the performance becomes very slow in load tests.

Some details from representative tests follow; the same behavior may manifest in other circumstances as well.

Sample load test details:
* 3 packages
* All packages are using PL/SQL objects
* When a 100-user test is run, performance is fine
* When running load test (run for periodic time) of 200-400 users, then a huge load/huge CPU usage is seen from any of the 3 packages

Details from another load test:
* Anonymous block running 100,000 times with a stored procedure with a PL/SQL object type
* This reproduces the problem

It's been observed that in these tests, the DBMS_PICKLER package runs occasionally, and seems to correlate with the spikes in bandwidth.

This reproduces across multiple target databases.
This reproduces when using the 9.0.x, 9.2.x.x, and 10.2.x.x JDBC driver.




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