SQL> select sql_id from v$sql where sql_text like 'delete from std_contract%';
SQL_ID
-------------
9wx6s3p84v3xw
SQL> set long 9999
SQL> select sql_text from v$sql where sql_id ='9wx6s3p84v3xw';
SQL_TEXT
------------------------------------------------------------------------------
delete from std_contract subpartition (P0000021) t1 where exists (select 1
from T_POLINFO_WN_000002 t2 where t1.Cntr_Id=t2.CntrId )
SQL>
SQL>
SQL>
SQL> !
$ ora plan 9wx6s3p84v3xw
Session altered.
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 9wx6s3p84v3xw, child number 0
-------------------------------------
delete from std_contract subpartition (P0000021) t1 where exists
(select 1 from T_POLINFO_WN_000002 t2 where t1.Cntr_Id=t2.CntrId )
Plan hash value: 668406912
-----------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | | | | 295K(100)| | | |
| 1 | DELETE | STD_CONTRACT | | | | | | | |
|* 2 | HASH JOIN RIGHT SEMI | | 13M| 1727M| 538M| 295K (1)| 00:59:02 | | |
| 3 | TABLE ACCESS FULL | T_POLINFO_WN_000002 | 13M| 380M| | 85240 (1)| 00:17:03 | | |
| 4 | PARTITION COMBINED ITERATOR| | 16M| 1577M| | 95085 (2)| 00:19:02 | KEY | KEY |
| 5 | TABLE ACCESS FULL | STD_CONTRACT | 16M| 1577M| | 95085 (2)| 00:19:02 | 1 | 1 |
-----------------------------------------------------------------------------------------------------------------------------
SQL> select index_name from dba_indexes where table_name ='STD_CONTRACT';
INDEX_NAME
------------------------------
IDX_STD_CONTACT_APPLNO
IDX_STD_CONTACT_CNTRNO
IDX_STD_CONTACT_CNTRID
IDX_STD_CONTRACT_INFORCE
IDX_STD_SGID
通过oradebug查看session的情况
Oracle session identified by:
{
instance: 1 (cmds.cmds1)
os id: 14419572
process id: 342, oracle@cmdsky01
session id: 3619
session serial #: 34985
}
is waiting for 'enq: TM - contention' with wait info:
{
p1: 'name|mode'=0x544d0003
p2: 'object #'=0x1a10c
p3: 'table/partition'=0x0
time in wait: 2714 min 58 sec
timeout after: never
wait id: 2058617
blocking: 0 sessions
current sql: delete from std_contract subpartition (P0000021) t1 where exists (select 1 from T_POLINFO_WN_000002 t
2 where t1.Cntr_Id=t2.CntrId )
short stack: ksedsts()+240<-ksdxfstk()+44<-ksdxcb()+3432<-sspuser()+116<-__sighandler()<-thread_wait()+580<-sskgpwwait(
)+32<-skgpwwait()+200<-ksliwat()+10772<-kslwaitctx()+180<-kjusuc()+3600<-ksipgetctxi()+1884<-ksqcmi()+22104<-ksqgtlctx()+2884<-ktaia
m()+700<-ktagetg0()+776<-ktagetp_internal()+232<-ktagetg_internal()+116<-ktagdw()+152<-ktaadm()+152<-kksfbc()+1860<-opiexe()+2020<-o
pipls()+2028<-opiodr()+908<-rpidrus()+216<-skgmstack()+160<-rpidru()+132<-rpiswu2()+520<-rpidrv()+1060<-psddr0()+448<-psdnal()+472<-
pevm_EXIM()+240<-
wait history:
* time between current wait and wait #1: 0.001417 sec
1. event: 'row cache lock'
time waited: 0.000372 sec
wait id: 2058616 p1: 'cache id'=0x10
p2: 'mode'=0x0
p3: 'request'=0x3
* time between wait #1 and #2: 0.002481 sec
2. event: 'library cache pin'
time waited: 0.000265 sec
wait id: 2058615 p1: 'handle address'=0x7000118a2602118
p2: 'pin address'=0x7000118a4aeb478
p3: '100*mode+namespace'=0x67138700010002
查看锁的情况
col OS_USER_NAME for a10
SELECT /*+ RULE */ ls.osuser os_user_name,
ls.username user_name,
decode(ls.type, 'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock', 'TX', 'Transaction enqueue lock', 'UL', 'User supplied lock') lock_type,
o.object_name OBJECT,
decode(ls.lmode, 1, NULL, 2, 'Row Share', 3, 'Row Exclusive', 4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive', NULL) lock_mode,
o.OWNER,
ls.sid,
ls.serial# serial_num,
ls.id1,
ls.id2
FROM sys.dba_objects o,
(
SELECT s.osuser,
s.username,
l.type,
l.lmode,
s.sid,
s.serial#,
l.id1,
l.id2
FROM v$session s,
v$lock l
WHERE s.sid = l.sid
) ls
WHERE o.object_id = ls.id1
AND o.OWNER ='CMDS'
ORDER BY o.OWNER,
o.object_name;
检查没有索引的外键，排除这个原因
SELECT * FROM (
SELECT c.table_name, cc.column_name, cc.position column_position
FROM user_constraints c, user_cons_columns cc
WHERE c.constraint_name = cc.constraint_name
AND c.constraint_type = 'R'
MINUS
SELECT i.table_name, ic.column_name, ic.column_position
FROM user_indexes i, user_ind_columns ic
WHERE i.index_name = ic.index_name
)
ORDER BY table_name, column_position;
TABLE_NAME COLUMN_NAME COLUMN_POSITION
------------------------------ -------------------- ---------------
DBFS$_MOUNTS S_NAME 2
DBFS_SFS$_FS TABID 1
DBFS_SFS$_FS VOLID 2
HS$_CLASS_CAPS CAP_NUMBER 1
HS$_CLASS_DD DD_TABLE_ID 1
HS$_FDS_INST FDS_CLASS_ID 1
HS$_INST_CAPS CAP_NUMBER 1
HS$_INST_DD DD_TABLE_ID 1
HS$_PARALLEL_HISTOGRAM_DATA DBLINK 1
HS$_PARALLEL_HISTOGRAM_DATA REMOTE_TABLE_NAME 2
HS$_PARALLEL_HISTOGRAM_DATA REMOTE_SCHEMA_NAME 3
HS$_PARALLEL_PARTITION_DATA DBLINK 1
HS$_PARALLEL_PARTITION_DATA REMOTE_TABLE_NAME 2
HS$_PARALLEL_PARTITION_DATA REMOTE_SCHEMA_NAME 3
HS$_PARALLEL_SAMPLE_DATA DBLINK 1
HS$_PARALLEL_SAMPLE_DATA REMOTE_TABLE_NAME 2
HS$_PARALLEL_SAMPLE_DATA REMOTE_SCHEMA_NAME 3
REGISTRY$ PID 2
REGISTRY$DEPENDENCIES REQ_NAMESPACE 1
REGISTRY$DEPENDENCIES REQ_CID 2
REGISTRY$PROGRESS NAMESPACE 1
REGISTRY$PROGRESS CID 2
WRM$_SNAPSHOT INSTANCE_NUMBER 2
WRM$_SNAPSHOT STARTUP_TIME 3
没有这个情况
杀掉这些session
select sql_id,state from v$session where sid=2873 and SERIAL#=39007;
select sql_id,state from v$session where sid=3619 and SERIAL#=34985;
select sql_id,state from v$session where sid=1699 and SERIAL#= 59001;
alter system kill session '2873,39007';
alter system kill session '3619,34985';
alter system kill session '1699,59001';
原因
从应用了解到insert是带append提示的，因为这个提示，不走sga，所以必须保证数据不被修改，而同时表上面有delete操作，表的数据被删除，两个操作应该是delete在insert之前或差不多同时进行，导致产生了独占锁。
处理方法是杀掉session，然后先insert数据，然后跑delete，经过这样的处理之后，insert在非常短的时间内就完成了，delete量较大，跑了大概一晚上的时间。