Oracle 10g中的SQL跟踪新方法

1. 先确定需要跟踪的Session或者Client

select * from v$session

--会话级别

可以设置identifier方便查询跟踪文件

alter session set TRACEFILE_IDENTIFIER = 'something_here';

begin

--当前自己的Session可以用:

--EXECUTE DBMS_MONITOR.SESSION_TRACE_ENABLE(NULL,NULL, TRUE, TRUE);

--别人的Session可以用:

--dbms_monitor.session_trace_disable(session_id=>97,serial_num=>17);

dbms_monitor.session_trace_enable(session_id=>97,serial_num=>17,waits=>TRUE,binds=>FALSE);

end;

查看启动的会话级别跟踪

select sql_trace,sql_trace_waits,sql_trace_binds from v$session where osuser='FASTENAL\txu'

select sql_trace,sql_trace_waits,sql_trace_binds from v$session

--客户端级别

begin

--dbms_monitor.client_id_trace_enable(client_id=>'LPT-SHAI08',waits=>TRUE,binds=>FALSE);

dbms_monitor.client_id_trace_disable(client_id=>'LPT-SHAI08');

end;

查看启动的客户级别跟踪

select * from dba_enabled_traces

2.确定跟踪文件的位置

--trace文件位置

select value from v$parameter where name='diagnostic_dest'

-- trace文件位置in 11g

select value from v$diag_info where name='Default Trace File'

3.使用tvd$xtat 生成报告。

The tool

http://antognini.ch/top/downloadable-files/

http://antognini.ch/downloads/tvdxtat_40beta9.zip

How to use tvdxtat to generate formatted trace file as html

Command line:

tvdxtat.cmd -i D:\ORACLE11XE\APP\ORACLE\diag\rdbms\xe\xe\trace\xe_ora_328.trc -o d:\mytvd.html -s no -w yes

下面是个收集直方图，删除直方图的例子

-自动收集和手动收集

begin
dbms_stats.gather_table_stats(ownname => 'SYS', tabname =>
'TAB1', estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE,
method_opt => 'FOR ALL COLUMNS SIZE AUTO');
end;

analyze table TAB1 compute statistics for columns B size 3

select histogram,num_buckets,column_name from user_tab_col_statistics
where table_name='TAB1' and column_name='B'

begin
dbms_stats.delete_column_stats(ownname => user,
tabname => 'TAB1',
colname => 'B',
col_stat_type => 'HISTOGRAM');
end;

select histogram,num_buckets,column_name from user_tab_col_statistics
where table_name='TAB1' and column_name='B'