owI 事件的收集

1。首先建立表

create table wait1 as
SELECT a.SID, a.seq#, a.event, a.p1text, a.p1, a.p1raw, a.p2text, a.p2,
a.p2raw, a.p3text, a.p3, a.p3raw, a.wait_time, a.seconds_in_wait,
a.state, b.serial#, b.username, b.osuser, b.paddr, b.logon_time,
b.process, b.sql_hash_value, b.saddr, b.module, b.row_wait_obj#,
b.row_wait_file#, b.row_wait_block#, b.row_wait_row#
FROM v$session_wait a, v$session b
WHERE a.SID = b.SID
AND b.username IS NOT NULL
AND b.TYPE <> 'BACKGROUND'
AND a.event IN
('db file sequential read',
'db file scattered read',
'latch free',
'direct path read',
'direct path write',
'enqueue',
'library cache pin',
'library cache load lock',
'buffer busy waits',
'free buffer waits'
);

2。建立這個指令碼，適當修改收集間隔以及次數，這種缺點就是可能會遺漏，不過大部分應該的問題應該收集到，可能對效能有影響，特別是已經很慢的時候。

begin
dbms_lock.sleep(1);
for i in 1 .. 30000
loop
INSERT INTO wait1
SELECT a.SID, a.seq#, a.event, a.p1text, a.p1, a.p1raw, a.p2text, a.p2, a.p2raw, a.p3text, a.p3,
a.p3raw, a.wait_time, a.seconds_in_wait, a.state, b.serial#, b.username, b.osuser, b.paddr,
b.logon_time, b.process, b.sql_hash_value, b.saddr, b.module, b.row_wait_obj#, b.row_wait_file#,
b.row_wait_block#, b.row_wait_row#
FROM v$session_wait a, v$session b
WHERE a.SID = b.SID
AND b.username IS NOT NULL
AND b.TYPE <> 'BACKGROUND'
AND a.event
IN
('db file sequential read',
'db file scattered read',
'latch free',
'direct path read',
'direct path write',
'enqueue',
'library cache pin',
'library cache load lock',
'buffer busy waits',
'free buffer waits'
);
commit ;
dbms_lock.sleep(3);
end loop;
end;
/