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What’s New in Oracle Database Performance

Tuning Guide?

This section describes new performance tuning features of Oracle Database 11g

Release 2 (11.2) and provides pointers to additional information. The features and

enhancements described in this section comprise the overall effort to optimize

database performance.

For a summary of all new features for Oracle Database 11g Release 2 (11.2), see Oracle

Database New Features Guide.

Oracle Database 11g Release 2 (11.2.0.4) New Features in Oracle

Database Performance

The new and updated performance tuning features include:

■ Dynamic statistics enhancements

In previous releases, Oracle Database only gathered dynamic statistics (previously

called dynamic sampling) when one or more of the tables in a query did not have

optimizer statistics. Starting in Oracle Database 11g Release 2 (11.2.0.4), the

optimizer can automatically decide whether dynamic statistics are useful and

which dynamic statistics level to use for all SQL statements. For example, the

optimizer automatically decides whether to gather dynamic statistics during table

scans, index access, joins, and GROUP BY operations. The enhanced behavior is

enabled only when the OPTIMIZER_DYNAMIC_SAMPLING initialization parameter is

set to the new value of 11.

See “Controlling Dynamic Statistics” on page 13-22.

Oracle Database 11g Release 2 (11.2.0.2) New Features in Oracle

Database Performance

The new and updated performance tuning features include:

■ Resource Manager enhancements for parallel statement queuing

You can use Resource Manager to control the order of statements in a parallel

statement queue. For example, you can ensure that high-priority statements spend

less time in the queue. Also, you can use a directive to prevent one consumer

group from monopolizing all of the parallel servers, and to specify the maximum

time in seconds that a parallel statement can wait to be launched.

For more information, see “Managing CPU Resources Using Oracle Database

Resource Manager” on page 9-10 and Oracle Database VLDB and Partitioning Guide.

xviii

■ Resource Manager enhancements for CPU utilization limit

You can use Resource Manager to limit the CPU consumption of a consumer

group. This feature restricts the CPU consumption of low-priority sessions and can

help provide more consistent performance for the workload in a consumer group.

For more information, see “Managing CPU Resources Using Oracle Database

Resource Manager” on page 9-10. ■ New package for Automatic SQL Tuning

The DBMS_AUTO_SQLTUNE package is the new interface for managing the Automatic

SQL Tuning task. Unlike the SQL Tuning Advisor package DBMS_SQLTUNE, which

requires ADVISOR privileges, DBMS_AUTO_SQLTUNE requires the DBA role.

For more information, see “Configuring Automatic SQL Tuning” on page 17-7. ■ Oracle Orion I/O Calibration Tool Documentation

Oracle Orion is a tool for predicting the performance of an Oracle database

without having to install Oracle or create a database. Unlike other I/O calibration

tools, Oracle Orion is expressly designed for simulating Oracle database I/O

workloads using the same I/O software stack as Oracle. Orion can also simulate

the effect of striping performed by Oracle Automatic Storage Management.

For more information, see “I/O Calibration with the Oracle Orion Calibration

Tool” on page 8-12.

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