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  • oracl database performance tuning guide 11gr2 PDF 下载

    oracl database performance tuning guide 11gr2 PDF 下载

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    主要内容:
    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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