解答：

常見的方法如下：

1、分析數(shù)據(jù)文件塊，轉(zhuǎn)儲(chǔ)數(shù)據(jù)文件n的塊m

alter system dump datafile n block m

2、分析日志文件

alter system dump logfile logfilename;

3、分析控制文件的內(nèi)容

alter session set events 'immediate trace name CONTROLF level 10'

4、分析所有數(shù)據(jù)文件頭

alter session set events 'immediate trace name FILE_HDRS level 10'

5、分析日志文件頭

alter session set events 'immediate trace name REDOHDR level 10'

6、分析系統(tǒng)狀態(tài)，最好每10分鐘一次，做三次對比

alter session set events 'immediate trace name SYSTEMSTATE level 10'

7、分析進(jìn)程狀態(tài)

alter session set events 'immediate trace name PROCESSSTATE level 10'

8、分析Library Cache的詳細(xì)情況

alter session set events 'immediate trace name library_cache level 10'

reference