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这篇文章主要介绍“怎么在 Oracle12.2 或更高版本上为 PDB 级别创建 AWR”，在日常操作中，相信很多人在怎么在 Oracle12.2 或更高版本上为 PDB 级别创建 AWR 问题上存在疑惑，丸趣 TV 小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”怎么在 Oracle12.2 或更高版本上为 PDB 级别创建 AWR”的疑惑有所帮助！接下来，请跟着丸趣 TV 小编一起来学习吧！
这是 12.2 或更高版本的新功能。
Oracle Database Performance Tuning Guide
12c Release 2 (12.1)
6.2.7 Managing Automatic Workload Repository in a Multitenant Environment
http://docs.oracle.com/database/122/TGDBA/gathering-database-statistics.htm#TGDBA-GUID-D64AEB01-18FF-47EF-BB5C-A0611117D180
可以按照以下详细步骤在 PDB 级别启用和创建 AWR 报告。
1) 在 PDB 级别设置 awr_pdb_autoflush_enabled=true：
alter session set container=PDB1;
alter system set awr_pdb_autoflush_enabled=true;2) 正确设置 AWR 快照
select * from cdb_hist_wr_control;
DBID SNAP_INTERVAL RETENTION TOPNSQL CON_ID
2580889417 +40150 00:01:00.0 +00008 00:00:00.0 DEFAULT 3
execute dbms_workload_repository.modify_snapshot_settings(interval = 60);
select * from cdb_hist_wr_control;
DBID SNAP_INTERVAL RETENTION TOPNSQL CON_ID
2580889417 +00000 01:00:00.0 +00008 00:00:00.0 DEFAULT 33) 另请将 AWR_SNAPSHOT_TIME_OFFSET 设置为 1000000，以避免多个 PDB 同时创建快照时出现性能问题。
Oracle Database 12c Release 2
Database Reference
1.26 AWR_SNAPSHOT_TIME_OFFSET
http://docs.oracle.com/database/122/REFRN/AWR_SNAPSHOT_TIME_OFFSET.htm#REFRN10325
alter system set AWR_SNAPSHOT_TIME_OFFSET=1000000 scope=both;AWR_SNAPSHOT_TIME_OFFSET
AWR_SNAPSHOT_TIME_OFFSET specifies an offset for the Automatic Workload Repository (AWR) snapshot start time.
PropertyDescription
Parameter type
Integer
Default value
There is no offset by default.
Modifiable
ALTER SYSTEM
Modifiable in a PDB
No
Range of values
0 – 3599, or the special value 1000000
Basic
No
Oracle RAC
Multiple instances should use the same value
AWR snapshots normally start at the top of the hour (12:00, 1:00, 2:00, and so on). This parameter allows DBAs to specify an offset for the AWR snapshot start time.
This is a useful parameter to avoid CPU spikes from multiple instances all starting their AWR snapshots at the same time. If you have a large system with many instances on it (like many Exadata installations), and you are experiencing such CPU spikes, this parameter can be very useful.
The parameter is specified in seconds. Normally, you set it to a value less than 3600. If you set the special value 1000000 (1,000,000), you get an automatic mode, in which the offset is based on the database name.
The automatic mode is an effective way of getting a reasonable distribution of offset times when you have a very large number of instances running on the same node.
4) 等待 1 - 2 小时以自动生成快照：
select * from awr_pdb_snapshot;
或者您可以手动创建快照：SQL connect / as sysdba
SQL alter session set container=PDB1;
SQL exec dbms_workload_repository.create_snapshot();
创建 AWR 报告：@?/rdbms/admin/awrrpt
Specify the location of AWR Data
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AWR_ROOT - Use AWR data from root (default)
AWR_PDB - Use AWR data from PDB ** Use the location AWR_PDB for a PDB level report5) 参考文档
如何在 12.2 或更高版本的 PDB 级别创建 AWR 报告 (文档 ID 2469637.1).docx到此，关于“怎么在 Oracle12.2 或更高版本上为 PDB 级别创建 AWR”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注丸趣 TV 网站，丸趣 TV 小编会继续努力为大家带来更多实用的文章！
