V$SESSION SQL_ID 為空,找不到SQL_ID
兄弟,是不是遇到過查詢 V$SESSION.SQL_ID 但是呢 SQL_ID 是空,然後找不到SQL的尷尬情況?太多人問這個問題了。
我相信你們也沒百度/GOOGLE到好的解決辦法,今天就分享一個方法,教大家抓SQL(本方法基於ORACLE11G,10G 就洗洗睡吧)。
首先我們來做個實驗:
SQL> select sid from v$mystat where rownum=1;
SID
----------
1150
SQL> update test set owner='BIGSB' where object_id<100;
98 rows updated
在1150這個SESSION裡面執行一個UPDATE,不要提交。
SQL> select sid from v$mystat where rownum=1;
SID
----------
1338
SQL> update test set owner='SB' where object_id<10;
在1338裡面跑另外一個UPDATE,因為1150沒提交,1138處於行鎖等待。
這個時候通過如下指令碼去查詢資料庫:
SQL> select inst_id, 2 sid, 3 sql_id, 4 event, 5 blocking_session, 6 blocking_instance 7 from gv$session a 8 where blocking_session is not null; INST_ID SID SQL_ID EVENT BLOCKING_SESSION BLOCKING_INSTANCE ---------- ---------- ------------- --------------------------------------- ---------------- ---------------- 1 1338 852mvmth18w37 enq: TX - row lock contention 1150 1 SQL> select sql_id from gv$session where inst_id=1 and sid=1150; SQL_ID -------------
確實,SQL_ID是空的,也許有人會說,那我去查詢PREV_SQL_ID,恩你去試一試吧,那個SQL_ID是事物的SQL_ID,並不是UPDATE的SQL_ID
SQL> select prev_sql_id from gv$session where inst_id=1 and sid=1150; PREV_SQL_ID ------------- 9m7787camwh4m SQL> select sql_text from gv$sql where sql_id='9m7787camwh4m'; SQL_TEXT -------------------------------------------------------------------------------- begin :id := sys.dbms_transaction.local_transaction_id; end;
所以很多人這個時候就蛋疼了,不知道咋辦。現在教大家另外一種方法
SQL> select PREV_EXEC_START,USERNAME,MODULE,ACTION FROM GV$SESSION WHERE INST_ID=1 AND SID=1150;
PREV_EXEC_START USERNAME MODULE ACTION
--------------- ------------------------------ -----------------------
2015-04-10 18:01:44 SCOTT PL/SQL Developer Command Window - New
SQL> SELECT SQL_ID,SQL_TEXT,LAST_ACTIVE_TIME,MODULE,ACTION FROM GV$SQL WHERE INST_ID=1 AND LAST_ACTIVE_TIME=TO_DATE('2015-04-10 18:01:44','YYYY-MM-DD HH24:MI:SS');
SQL_ID SQL_TEXT LAST_ACTIVE_TIME MODULE ACTION
------------- -------------------------------------------------------------------------------- ---------------- ---------------------------------------------------------------- ----------------------------------------------------------------
2syvqzbxp4k9z select u.name, o.name, a.interface_version#, o.obj# from association$ a, us 2015/4/10 18:01:
6c9wx6z8w9qpu select a.default_selectivity from association$ a 2015/4/10 18:01:
2xyb5d6xg9srh select a.default_cpu_cost, a.default_io_cost from association$ a 2015/4/10 18:01:
d1s917pgj7650 update test set owner='BIGSB' where object_id<100 2015/4/10 18:01: PL/SQL Developer Command Window - New
現在就可以把SQL 抓到了
請注意:
1.在高併發的情況下,可能會出現多個可疑SQL
2.UPDATE執行過後,又繼續執行新的SQL,就悲催了,這個時候要自己把所有SQL抓出來,按照時間線排序,CHECK
反正,提供了一種思路,具體的時候請自己判斷,腦袋不要太笨。
select a.inst_id, a.sid, a.sql_id, b.sql_id, b.sql_text
from gv$session a, gv$sql b
where a.inst_id = b.inst_id
and a.PREV_EXEC_START = b.LAST_ACTIVE_TIME
and a.USERNAME = b.PARSING_SCHEMA_NAME
and a.MODULE = b.MODULE
--and a.ACTION_HASH = b.ACTION_HASH
select a.inst_id,
a.sid,
a.event,
a.sql_id,
b.sql_text running_sql,
c.sql_in_session,
c.sql_id_in_v$sql,
c.sql_text blocking_sql,
a.blocking_session,
a.blocking_instance
from gv$session a,
(select sql_id, sql_text
from (select sql_id,
sql_text,
row_number() over(partition by sql_id order by sql_id) as rn
from gv$sql)
where rn = 1) b,
(select a.inst_id,
a.sid,
a.sql_id sql_in_session,
b.sql_id sql_id_in_v$sql,
b.sql_text
from gv$session a, gv$sql b
where a.inst_id = b.inst_id
and a.PREV_EXEC_START =b.LAST_ACTIVE_TIME
and a.USERNAME = b.PARSING_SCHEMA_NAME
and a.MODULE = b.MODULE
) c
where a.sql_id = b.sql_id
and a.blocking_session is not null
and a.BLOCKING_SESSION = c.sid
and a.BLOCKING_INSTANCE = c.inst_id;