如何利用ash监控会话(三)
1 4 60256
block# 60256
blocks 1
64 rows selected.
Elapsed: 00:00:00.40
SQL> @getsql_sqlid
Enter 1 for curr sql, 2 for hist sql,default 1:
Enter value for sqlid: fqcxb1n33642x
SQL_FULLTEXT
---------------------------------------------------------------------------------------------
select count(*) from big
Elapsed: 00:00:00.00
Elapsed: 00:00:00.00
SQL> @getobj_id
Enter value for dblink:
Enter value for obj_id: 76851
OWNER OBJECT_NAME OBJECT_TYPE CREATED STATUS
-------------------- ------------------------------ ------------------- ------------------- -------
SCOTT BIG TABLE 2014-11-20 15:56:23 VALID
1 row selected.
Elapsed: 00:00:00.01
SQL> @getobj_fb
Enter value for file_id: 4
Enter value for block_id: 60256
OWNER SEGMENT_NAME SEGMENT_TY
--------------- -------------------- ----------
SCOTT BIG TABLE
1 row selected.
Elapsed: 00:00:00.37
--------------------------@脚本--------------------
--@big
@sid
set feedback off
drop table big;
create table big as select * from dba_objects;
insert into big select * from big;
/
/
/
/
/
commit;
select SUM(bytes) / 1024 / 1024 big_M from dba_segments where segment_name = 'BIG';
select count(*) from big;
set feedback on
--@getash_sid
col p_name for a15
col p_value for a15
select SESSION_ID,
NAME,
P1TEXT||chr(10)||P2TEXT||chr(10)||P3TEXT p_name,
p1||chr(10)||p2||chr(10)||p3 p_value,
sql_id,
WAIT_TIME,
CURRENT_OBJ#,
CURRENT_FILE#,
CURRENT_BLOCK#
from v$active_session_history ash, v$event_name enm
where ash.event# = enm.event#
and SESSION_ID = &sid
order by sample_time;
----------------------------------------
--DBA_HIST_ACTIVE_SESS_HISTORY的监控：--
----------------------------------------
--查当前时间
select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;
--根据时间找到snap_id（8天内，1小时前），因为基表非常大，利用snap_id的索引才能快速查询
select distinct snap_id from dba_hist_snapshot b where to_date('2014-11-20 14:08:12','yyyy-mm-dd hh24:mi:ss') between b.begin_interval_time and b.end_interval_time;
--top instance
select /*+parallel(a,8)*/instance_number,count(*) from dba_hist_active_sess_history a where a.snap_id=67421 group by instance_number;
--top event
select /*+parallel(a,8)*/event,count(*) from dba_hist_active_sess_history a
where a.snap_id=67421
and instance_number=2
and sample_time>
=to_timestamp('2014-11-20 14:07:12','yyyy-mm-dd hh24:mi:ss')
and sample_time<=to_timestamp('2014-11-20 14:08:12','yyyy-mm-dd hh24:mi:ss')
group by event
order by count(*) desc;
--top user
select /*+parallel(a,8)*/user_id,(select username from dba_users b where b.user_id=a.user_id) username,count(*) from dba_hist_active_sess_history a
where a.snap_id=67421
and instance_number=2
and sample_time>=to_timestamp('2014-11-20 14:07:12','yyyy-mm-dd hh24:mi:ss')
and sample_time<=to_timestamp('2014-11-20 14:08:12','yyyy-mm-dd hh24:mi:ss')
group by user_id
order by count(*) desc;
--top sql
select /*+parallel(a,8)*/sql_id,count(*) from dba_hist_active_sess_history a
where a.snap_id=67421
and instance_number=2
and sample_time>=to_timestamp('2014-11-20 14:07:12','yyyy-mm-dd hh24:mi:ss')
and sample_time<=to_timestamp('2014-11-20 14:08:12','yyyy-mm-dd hh24:mi:ss')
group by sql_id
order by count(*) desc;
-- select SQL_TEXT from dba_hist_sqltext where sql_id='49p4hfj6azw19';
--top program
select /*+parallel(a,8)*/program,count(*) from dba_hist_active_sess_history a
where a.snap_id=67421
and instance_number=2
and sample_time>=to_timestamp('2014-11-20 14:07:12','yyyy-mm-dd hh24:mi:ss')
and sample_time<=to_timestamp('2014-11-20 14:08:12','yyyy-mm-dd hh24:mi:ss')
group by program
order by count(*) desc;