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這篇文章主要介紹“怎么在 Oracle12.2 或更高版本上為 PDB 級別創(chuàng)建 AWR”,在日常操作中,相信很多人在怎么在 Oracle12.2 或更高版本上為 PDB 級別創(chuàng)建 AWR 問題上存在疑惑,丸趣 TV 小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”怎么在 Oracle12.2 或更高版本上為 PDB 級別創(chuàng)建 AWR”的疑惑有所幫助!接下來,請跟著丸趣 TV 小編一起來學習吧!
這是 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
可以按照以下詳細步驟在 PDB 級別啟用和創(chuàng)建 AWR 報告。
1) 在 PDB 級別設置 awr_pdb_autoflush_enabled=true:
alter session set container=PDB1;
alter system set awr_pdb_autoflush_enabled=true;
2) 正確設置 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 3
3) 另請將 AWR_SNAPSHOT_TIME_OFFSET 設置為 1000000,以避免多個 PDB 同時創(chuàng)建快照時出現(xiàn)性能問題。
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 小時以自動生成快照:
select * from awr_pdb_snapshot;
或者您可以手動創(chuàng)建快照:SQL connect / as sysdba
SQL alter session set container=PDB1;
SQL exec dbms_workload_repository.create_snapshot();
創(chuàng)建 AWR 報告:@?/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 report
5) 參考文檔
如何在 12.2 或更高版本的 PDB 級別創(chuàng)建 AWR 報告 (文檔 ID 2469637.1).docx
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