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Recommended Patches for Parallel Statement Queuing in 11.2.0.2 and 11.2.0.3 (Doc ID 1340180.1)

Last updated on APRIL 12, 2022

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Details

This document applies to Oracle RDBMS Enterprise Edition, versions 11.2.0.2 and 11.2.0.3.  This note does not apply to Parallel Statement Queuing in 11.2.0.1.

The Oracle Database Resource Manager can be used in many ways - managing CPU, I/O, parallel execution, runaway queries, etc. This note addresses issues that are specific to managing parallel execution using Parallel Statement Queuing. Parallel Statement Queuing is enabled by setting the parameter parallel_degree_policy to "auto". 

Below is a list of the most critical, known bugs for Parallel Statement Queuing. These bug fixes are recommended for all customers that are either evaluating or using Parallel Statement Queuing.

For other recommended bug fixes, monitoring scripts, and other tips for Resource Manager, see the Primary Note for Oracle Database Resource Manager MOS <Document 1339769.1>.

Bug Bug Description Recommended Releases
10180307

DBRM DBMS_RESOUCE_MANAGER.CALIBRATE_IO REPORTS VERY HIGH MAX_PMBPS ON EXADATA

The database calibration function, dbms_resource_manager.calibrate_io(), is used to generate optimal degree-of-parallelism when parallel_degree_policy = "auto". This fix decreases the amount of time needed to run database calibration on RAC databases. It also generates more accurate data, leading to better SQL execution plans and more optimal degree-of-parallelism. 

11.2.0.2
10204358

INCORRECT PQQ STATS FOR NON-REGULATED VT'S (LOG MINER - MS01)

This bug fix prevents errors like ORA-700 [kgskmodsvcdop:negative] and ORA-700 [kskqfinish_int:baddecr1] when Parallel Statement Queuing is used with log miner or other Oracle backgrounds that use parallel execution.

11.2.0.2
11674898

DBMV2: ORA-600[1433] SIGNALED AND INSTANCE TERMINATION

This error can occur when Parallel Statement Queuing is used with the "switch_group" directive for runaway query management. This bug can cause parallel execution to hang.

11.2.0.2
10047058

SESSION MADE INACTIVE TOO EARLY WITH REGARD TO PQQ
This bug causes Parallel Statement Queuing to miscount the number of active parallel servers for parallel statements containing multiple parallelizers.

11.2.0.3

Actions

 The defect 10047058 is fixed in 11.2.0.3. If this is not possible to upgrade 11.2.0.3, a backport for 11.2.0.2 can be requested raising a Service Request at Oracle Support.

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