12cR2_AWR相关参数设置

Oracle 12cR2

创新互联公司专注为客户提供全方位的互联网综合服务，包含不限于网站制作、成都网站建设、弓长岭网络推广、成都小程序开发、弓长岭网络营销、弓长岭企业策划、弓长岭品牌公关、搜索引擎seo、人物专访、企业宣传片、企业代运营等，从售前售中售后，我们都将竭诚为您服务，您的肯定，是我们最大的嘉奖；创新互联公司为所有大学生创业者提供弓长岭建站搭建服务，24小时服务热线：13518219792，官方网址：www.cdcxhl.com

性能优化文档。

https://docs.oracle.com/database/122/TDPPT/oracle-database-performance-method.htm#TDPPT007

Gathering Database Statistics Using the Automatic Workload Repository

Database statistics provide information about the type of load on the database and the internal and external resources used by the database. To accurately diagnose performance problems with the database using ADDM, statistics must be available.

A cumulative statistic is a count such as the number of block reads. Oracle Database generates many types of cumulative statistics for the system, sessions, and individual SQL statements. Oracle Database also tracks cumulative statistics about segments and services. Automatic Workload Repository (AWR) automates database statistics gathering by collecting, processing, and maintaining performance statistics for database problem detection and self-tuning purposes.

By default, the database gathers statistics every hour and creates an AWR snapshot, which is a set of data for a specific time that is used for performance comparisons. The delta values captured by the snapshot represent the changes for each statistic over the time period. Statistics gathered by AWR are queried from memory. The gathered data can be displayed in both reports and views.

--每小时收集一次AWR快照

The following initialization parameters are relevant for AWR:

--下面是两个和AWR相关的参数。

• STATISTICS_LEVEL

  Set this parameter to TYPICAL (default) or ALL to enable statistics gathering by AWR. Setting STATISTICS_LEVEL to BASIC disables many database features, including AWR, and is not recommended.

   --设置以上参数为basic会禁用掉很多数据库特性，包括AWR，不建议设置basic

• CONTROL_MANAGEMENT_PACK_ACCESS

  Set to DIAGNOSTIC+TUNING (default) or DIAGNOSTIC to enable automatic database diagnostic monitoring. Setting CONTROL_MANAGEMENT_PACK_ACCESS to NONE disables many database features, including ADDM, and is strongly discouraged.

       --关闭此参数会禁用掉很多数据库的特性，包括ADDM,不建议关闭。

SQL> show parameter statistics_level        --默认值不需要修改

NAME                                 TYPE        VALUE
------------------------ ----------- ------------------------------
statistics_level                     string      TYPICAL

SQL> show parameter control_management   --默认值不需要修改

NAME                                                     TYPE        VALUE
-------------------------------------- ----------- ------------------------------
control_management_pack_access      string      DIAGNOSTIC+TUNING
SQL>

以上大家知道我们收集到AWR信息是和那些参数有关，默认设置即可，不需要修改。

建议大家看英文官方文档，学英语学技术，哦也！

分享题目：12cR2_AWR相关参数设置
网页URL：http://scjbc.cn/article/iipogc.html