ash停止不动无法产生报告问题解决
1、数据库版本 oracle 11.2.0.3.0 2、问题现象 使用ashrpt.sql生成ash报告时，在输入完成起始时间、指定报告文件存放路径与文件名称后，静止无反应。 SQL @?/rdbms/admin/ashrpt.sql ...... Using the report name /home/oracle/ashrpt_1_0802_1932.html Sum
1、数据库版本
oracle 11.2.0.3.0
2、问题现象
使用ashrpt.sql生成ash报告时，在输入完成起始时间、指定报告文件存放路径与文件名称后，静止无反应。
|
SQL> @?/rdbms/admin/ashrpt.sql ...... Using the report name /home/oracle/ashrpt_1_0802_1932.html
Summary of All User Input ------------------------- Format : HTML DB Id : 2024181297 Inst num : 1 Begin time : 02-Aug-14 19:22:34 End time : 02-Aug-14 19:32:34 Slot width : Default Report targets : 0 Report name : /home/oracle/ashrpt_1_0802_1932.html
停在这里不动了...... |
3、问题分析
3.1、查看ashrpt会话在等待什么
|
SQL> select sid,program,event from v$session where sid=1590; SID PROGRAM EVENT ----------------------------------------------------------------------------------------------------- 1590 sqlplus@nosql1 (TNS V1-V3) control file sequential read |
待待事件持续为“control filesequential read”
3.2、查看optimizer_mode参数设置值
|
SQL> show parameter optimizer_mode
NAME TYPE VALUE -------------------------------------------------------------------------------------------------- optimizer_mode string FIRST_ROWS_10 |
发现optimizer_mode并非为默认值all_rows,而是被修改成了first_rows_10
3.3 分析初步小结
根据上面等待事件的不正常性，以及optimizer_mode被修改的值相结合，怀疑很有可能是ORACLE的BUG。
4、分析结果验证
在metalink上，查到文章13794366.8 ,确认为ORACLE 11.2.0.2、11.2.0.3上因为设置参数OPTIMIZER_MODE=FIRST_ROWS_N的BUG ，在11.2.0.4上解决。
DescriptionASH reports can take a really long to complete if the optimizer_mode parameter Copy after login is set to FIRST_ROWS_N Copy after login <strong><u>Rediscovery Notes</u></strong> Copy after login ASH reports will take a long time to complete when optimizer_mode parameter is Copy after login set to FIRST_ROWS_N Copy after login <strong><u>Workaround</u></strong> Copy after login None Copy after login |
5、解决方法
为了不因为修改optimizer_mode参数对系统其它方面造成影响，所以选择在创建ash报告的session级别修改参数值为"all_rows"的方式，达到能成功生成ash报告的目的
|
SQL> alter session set optimizer_mode='all_rows'; SQL> @?/rdbms/admin/ashrpt.sql
......
End of Report |
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