DBA LOCKS
DB CAFE
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select l.session_id, l.oracle_username, l.os_user_name, o.object_name , o.owner
from gv$locked_object l, dba_objects o
where l.object_id = o.object_id;select l.session_id, l.oracle_username, l.os_user_name, o.object_name , o.owner,
'alter system kill session ''' || s.sid || ',' || s.serial# ||''';' kill_session
from v$locked_object l, dba_objects o, v$session s
where l.object_id = o.object_id
and l.session_id = s.sid;
select sid, serial#
from gv$session
where sid = 0000;alter sysetm kill session '';select s.sid, s.serial#, p.spid unix_process, s.osuser, s.username, s.machine, s.program,
s.sql_hash_value current_hash_value, q1.sql_text current_sql_text, s.prev_hash_value prev_hash_value,
q2.sql_text prev_sql_text, to_char(s.logon_time,'DD/MM/YYYY HH24:MI') session_logon_time,
o.owner ||'.'|| o.object_name locked_object, l.type lock_type, l.lmode lock_mode, l.ctime lock_time_in_sec
from v$lock l, v$session s, v$process p, v$sqlarea q1, v$sqlarea q2, dba_objects o
where l.lmode in (3,5,6) and l.type in ('TX','TM','UL')
and l.sid=s.sid and s.paddr=p.addr(+)
and s.sql_hash_value=q1.hash_value(+)
and s.prev_hash_value=q2.hash_value(+)
and l.id1=o.object_id(+)
and l.ctime> &secs
order by l.ctime;Metalink Note:29787.1 for information about lock types/modes.
Note:15476.1 3. Which lock modes are required for which table action? The following table describes what lock modes on DML enqueues are actually gotten for which table operations in a standard Oracle installation.
Operation Lock Mode LMODE Lock Description
--------- ----- ----------------
Select NULL 1 null Select for update SS 2 sub share Insert SX 3 sub exclusive Update SX 3 sub exclusive Delete SX 3 sub exclusive Lock For Update SS 2 sub share Lock Share S 4 share Lock Exclusive X 6 exclusive Lock Row Share SS 2 sub share Lock Row Exclusive SX 3 sub exclusive Lock Share Row Exclusive SSX 5 share/sub exclusive Alter table X 6 exclusive Drop table X 6 exclusive Create Index S 4 share Drop Index X 6 exclusive Truncate table X 6 exclusive
4. Lock 호환성 작동 방식
1 ========================[편집]
The compatibility of lock modes are normally represented by following matrix:
NULL SS SX S SSX X
NULL YES YES YES YES YES YES SS YES YES YES YES YES no SX YES YES YES no no no S YES YES no YES no no SSX YES YES no no no no X YES no no no no no
5. Which views can be used to detect locking problems?
2 ============================================[편집]
A number of Oracle views permits to detect locking problems. V$SESSION_WAIT When a session is waiting on a resource, it can be found waiting on the enqueue wait event, e.g. SELECT * FROM V$SESSION_WAIT WHERE EVENT = 'enqueue'; - SID identifier of session holding the lock - P1, P2, P3 determine the resource when event = 'enqueue' - SECONDS_IN_WAIT gives how long the wait did occurs V$SESSION session information and row locking information - SID, SERIAL# identifier of the session - LOCKWAIT address of the lock waiting, otherwise null - ROW_WAIT_OBJ# object identified of the object we are waiting on
(object_id of dba_objects)
- ROW_WAIT_FILE#, ROW_WAIT_BLOCK#, ROW_WAIT_ROW# file_id , block_id and
row location within block of the locked row
V$LOCK list of all the locks in the system - SID identifier of session holding the lock - TYPE, ID1 and ID2 determine the resource - LMODE and REQUEST indicate which queue the session is waiting on, as follows:
LMODE > 0, REQUEST = 0 owner LMODE = 0, REQUEST > 0 acquirer LMODE > 0, REQUEST > 0 converter
- CTIME time since current mode was converted (see Note 223146.1) - BLOCK are we blocking another lock
BLOCK = 0 non blocking BLOCK = 1 blocking others
DBA_LOCK or DBA_LOCKS formatted view on V$LOCK (created via $ORACLE_HOME/rdbms/admin/catblock.sql) - SESSION_ID == SID in V$LOCK - LOCK_TYPE, LOCK_ID1, LOCK_ID2 formatted value of TYPE, ID1, ID2 from V$LOCK - MODE_HELD and MODE_REQUESTED formatted value of LMODE and REQUEST from V$LOCK - LAST_CONVERT == CTIME of V$LOCK - BLOCKING_OTHERS formatted value of BLOCK from V$LOCK V$TRANSACTION_ENQUEUE subset of V$LOCK for the blocking TX resources only (same description as for the V$LOCK view) V$ENQUEUE_LOCK subset of V$LOCK for the system resources only and blocked TX resources only. (same description as for the V$LOCK view) DBA_DML_LOCKS subset of the V$LOCK for the DML (TM) locks only (created via $ORACLE_HOME/rdbms/admin/catblock.sql
- same description as the DBA_LOCK view)
V$LOCKED_OBJECT same info as DBA_DML_LOCKS, but linked with the rollback and session information - XIDUSN, XIDSLOT and XIDSQN rollback information to be linked with V$TRANSACTION - OBJECT_ID object being locked - SESSION_ID session id - ORACLE_USERNAME oracle user name - OS_USER_NAME OS user name - PROCESS OS process id - LOCKED_MODE lock mode V$RESOURCE list of all the currently locked resources in the system. Each row can be associated with one or more rows in V$LOCK - TYPE, ID1 and ID2 determine the resource DBA_DDL_LOCKS has a row for each DDL lock that is being held, and one row for each outstanding request for a DDL lock. It is subset of DBA_LOCKS same description as the DBA_LOCK view DBA_WAITERS view that retrieve information for each session waiting on a lock (created via $ORACLE_HOME/rdbms/admin/catblock.sql) - WAITING_SESSION waiting session - HOLDING_SESSION holding session - LOCK_TYPE, LOCK_ID1, LOCK_ID2 resource locked - MODE_HELD lock type held - MODE_REQUESTED lock type requested DBA_BLOCKERS view that gives the blocking sessions (created via $ORACLE_HOME/rdbms/admin/catblock.sql) -HOLDING_SESSION holding session
select B.SID, C.USERNAME, C.OSUSER, C.TERMINAL,
DECODE(B.ID2, 0, A.OBJECT_NAME,
'Trans-'||to_char(B.ID1)) OBJECT_NAME,
B.TYPE,
DECODE(B.LMODE,0,'--Waiting--',
1,'Null',
2,'Row Share',
3,'Row Excl',
4,'Share',
5,'Sha Row Exc',
6,'Exclusive',
'Other') "Lock Mode",
DECODE(B.REQUEST,0,' ',
1,'Null',
2,'Row Share',
3,'Row Excl',
4,'Share',
5,'Sha Row Exc',
6,'Exclusive',
'Other') "Req Mode"
from DBA_OBJECTS A, V$LOCK B, V$SESSION C
where A.OBJECT_ID(+) = B.ID1
and B.SID = C.SID
and C.USERNAME is not null
order by B.SID, B.ID2;
select nvl(S.USERNAME,'Internal') username,
nvl(S.TERMINAL,'None') terminal,
L.SID||','||S.SERIAL# Kill,
U1.NAME||'.'||substr(T1.NAME,1,20) tab,
decode(L.LMODE,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) lmode,
decode(L.REQUEST,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) request
from V$LOCK L,
V$SESSION S,
SYS.USER$ U1,
SYS.OBJ$ T1
where L.SID = S.SID
and T1.OBJ# = decode(L.ID2,0,L.ID1,L.ID2)
and U1.USER# = T1.OWNER#
and S.TYPE != 'BACKGROUND'
order by 1,2,5
/set linesize 80
set pagesize 66
column lmode heading 'Lock|Held' format a4
column request heading 'Lock|Req.' format a4
column username format a10 heading "Username"
column tab format a30 heading "Table Name"
column LAddr heading "ID1 - ID2" format a16
column Lockt heading "Lock|Type" format a4
select nvl(S.USERNAME,'Internal') username,
decode(command,
0,'None',decode(l.id2,0,U1.NAME||'.'||substr(T1.NAME,1,20),
'Rollback Segment')) tab,
decode(L.LMODE,1,'NoLk', 2,' RS ', 3,' RX ',
4,' S ', 5,' SRX', 6,' X ','NONE') lmode,
decode(L.REQUEST,1,'NoLk', 2,' RSh ', 3,' RX ',
4,' S ', 5,' SRX', 6,' X ','NONE') request,
l.id1||'-'||l.id2 Laddr, l.type Lockt
from V$LOCK L, V$SESSION S, SYS.USER$ U1, SYS.OBJ$ T1
where L.SID = S.SID and T1.OBJ# = decode(L.ID2,0,L.ID1,1)
and U1.USER# = T1.OWNER# and S.TYPE != 'BACKGROUND'
order by 1,2,5
/set lines 200
set pagesize 66
break on Kill on sid on username on terminal
column Kill heading 'Kill String' format a13
column res heading 'Resource Type' format 999
column id1 format 9999990
column id2 format 9999990
column locking heading 'Lock Held/Lock Requested' format a40
column lmode heading 'Lock Held' format a20
column request heading 'Lock Requested' format a20
column serial# format 99999
column username format a10 heading "Username"
column terminal heading Term format a6
column tab format a30 heading "Table Name"
column owner format a9
column LAddr heading "ID1 - ID2" format a18
column Lockt heading "Lock Type" format a40
column command format a25
column sid format 990
select
nvl(S.USERNAME,'Internal') username,
L.SID,
nvl(S.TERMINAL,'None') terminal,
decode(command,
0,'None',decode(l.id2,0,U1.NAME||'.'||substr(T1.NAME,1,20),'None')) tab,
decode(command,
0,'BACKGROUND',
1,'Create Table',
2,'INSERT',
3,'SELECT',
4,'CREATE CLUSTER',
5,'ALTER CLUSTER',
6,'UPDATE',
7,'DELETE',
8,'DROP',
9,'CREATE INDEX',
10,'DROP INDEX',
11,'ALTER INDEX',
12,'DROP TABLE',
13,'CREATE SEQUENCE',
14,'ALTER SEQUENCE',
15,'ALTER TABLE',
16,'DROP SEQUENCE',
17,'GRANT',
18,'REVOKE',
19,'CREATE SYNONYM',
20,'DROP SYNONYM',
21,'CREATE VIEW',
22,'DROP VIEW',
23,'VALIDATE INDEX',
24,'CREATE PROCEDURE',
25,'ALTER PROCEDURE',
26,'LOCK TABLE',
27,'NO OPERATION',
28,'RENAME',
29,'COMMENT',
30,'AUDIT',
31,'NOAUDIT',
32,'CREATE EXTERNAL DATABASE',
33,'DROP EXTERNAL DATABASE',
34,'CREATE DATABASE',
35,'ALTER DATABASE',
36,'CREATE ROLLBACK SEGMENT',
37,'ALTER ROLLBACK SEGMENT',
38,'DROP ROLLBACK SEGMENT',
39,'CREATE TABLESPACE',
40,'ALTER TABLESPACE',
41,'DROP TABLESPACE',
42,'ALTER SESSION',
43,'ALTER USER',
44,'COMMIT',
45,'ROLLBACK',
46,'SAVEPOINT',
47,'PL/SQL EXECUTE',
48,'SET TRANSACTION',
49,'ALTER SYSTEM SWITCH LOG',
50,'EXPLAIN',
51,'CREATE USER',
52,'CREATE ROLE',
53,'DROP USER',
54,'DROP ROLE',
55,'SET ROLE',
56,'CREATE SCHEMA',
57,'CREATE CONTROL FILE',
58,'ALTER TRACING',
59,'CREATE TRIGGER',
60,'ALTER TRIGGER',
61,'DROP TRIGGER',
62,'ANALYZE TABLE',
63,'ANALYZE INDEX',
64,'ANALYZE CLUSTER',
65,'CREATE PROFILE',
66,'DROP PROFILE',
67,'ALTER PROFILE',
68,'DROP PROCEDURE',
69,'DROP PROCEDURE',
70,'ALTER RESOURCE COST',
71,'CREATE SNAPSHOT LOG',
72,'ALTER SNAPSHOT LOG',
73,'DROP SNAPSHOT LOG',
74,'CREATE SNAPSHOT',
75,'ALTER SNAPSHOT',
76,'DROP SNAPSHOT',
79,'ALTER ROLE',
85,'TRUNCATE TABLE',
86,'TRUNCATE CLUSTER',
87,'-',
88,'ALTER VIEW',
89,'-',
90,'-',
91,'CREATE FUNCTION',
92,'ALTER FUNCTION',
93,'DROP FUNCTION',
94,'CREATE PACKAGE',
95,'ALTER PACKAGE',
96,'DROP PACKAGE',
97,'CREATE PACKAGE BODY',
98,'ALTER PACKAGE BODY',
99,'DROP PACKAGE BODY',
command||' - ???') COMMAND,
decode(L.LMODE,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive','NONE') lmode,
decode(L.REQUEST,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive','NONE') request,
l.id1||'-'||l.id2 Laddr,
l.type||' - '||
decode(l.type,
'BL','Buffer hash table instance lock',
'CF',' Control file schema global enqueue lock',
'CI','Cross-instance function invocation instance lock',
'CS','Control file schema global enqueue lock',
'CU','Cursor bind lock',
'DF','Data file instance lock',
'DL','Direct loader parallel index create',
'DM','Mount/startup db primary/secondary instance lock',
'DR','Distributed recovery process lock',
'DX','Distributed transaction entry lock',
'FI','SGA open-file information lock',
'FS','File set lock',
'HW','Space management operations on a specific segment lock',
'IN','Instance number lock',
'IR','Instance recovery serialization global enqueue lock',
'IS','Instance state lock',
'IV','Library cache invalidation instance lock',
'JQ','Job queue lock',
'KK','Thread kick lock',
'MB','Master buffer hash table instance lock',
'MM','Mount definition gloabal enqueue lock',
'MR','Media recovery lock',
'PF','Password file lock',
'PI','Parallel operation lock',
'PR','Process startup lock',
'PS','Parallel operation lock',
'RE','USE_ROW_ENQUEUE enforcement lock',
'RT','Redo thread global enqueue lock',
'RW','Row wait enqueue lock',
'SC','System commit number instance lock',
'SH','System commit number high water mark enqueue lock',
'SM','SMON lock',
'SN','Sequence number instance lock',
'SQ','Sequence number enqueue lock',
'SS','Sort segment lock',
'ST','Space transaction enqueue lock',
'SV','Sequence number value lock',
'TA','Generic enqueue lock',
'TD','DDL enqueue lock',
'TE','Extend-segment enqueue lock',
'TM','DML enqueue lock',
'TO','Temporary Table Object Enqueue',
'TT','Temporary table enqueue lock',
'TX','Transaction enqueue lock',
'UL','User supplied lock',
'UN','User name lock',
'US','Undo segment DDL lock',
'WL','Being-written redo log instance lock',
'WS','Write-atomic-log-switch global enqueue lock',
'TS',decode(l.id2,0,'Temporary segment enqueue lock (ID2=0)',
'New block allocation enqueue lock (ID2=1)'),
'LA','Library cache lock instance lock (A=namespace)',
'LB','Library cache lock instance lock (B=namespace)',
'LC','Library cache lock instance lock (C=namespace)',
'LD','Library cache lock instance lock (D=namespace)',
'LE','Library cache lock instance lock (E=namespace)',
'LF','Library cache lock instance lock (F=namespace)',
'LG','Library cache lock instance lock (G=namespace)',
'LH','Library cache lock instance lock (H=namespace)',
'LI','Library cache lock instance lock (I=namespace)',
'LJ','Library cache lock instance lock (J=namespace)',
'LK','Library cache lock instance lock (K=namespace)',
'LL','Library cache lock instance lock (L=namespace)',
'LM','Library cache lock instance lock (M=namespace)',
'LN','Library cache lock instance lock (N=namespace)',
'LO','Library cache lock instance lock (O=namespace)',
'LP','Library cache lock instance lock (P=namespace)',
'LS','Log start/log switch enqueue lock',
'PA','Library cache pin instance lock (A=namespace)',
'PB','Library cache pin instance lock (B=namespace)',
'PC','Library cache pin instance lock (C=namespace)',
'PD','Library cache pin instance lock (D=namespace)',
'PE','Library cache pin instance lock (E=namespace)',
'PF','Library cache pin instance lock (F=namespace)',
'PG','Library cache pin instance lock (G=namespace)',
'PH','Library cache pin instance lock (H=namespace)',
'PI','Library cache pin instance lock (I=namespace)',
'PJ','Library cache pin instance lock (J=namespace)',
'PL','Library cache pin instance lock (K=namespace)',
'PK','Library cache pin instance lock (L=namespace)',
'PM','Library cache pin instance lock (M=namespace)',
'PN','Library cache pin instance lock (N=namespace)',
'PO','Library cache pin instance lock (O=namespace)',
'PP','Library cache pin instance lock (P=namespace)',
'PQ','Library cache pin instance lock (Q=namespace)',
'PR','Library cache pin instance lock (R=namespace)',
'PS','Library cache pin instance lock (S=namespace)',
'PT','Library cache pin instance lock (T=namespace)',
'PU','Library cache pin instance lock (U=namespace)',
'PV','Library cache pin instance lock (V=namespace)',
'PW','Library cache pin instance lock (W=namespace)',
'PX','Library cache pin instance lock (X=namespace)',
'PY','Library cache pin instance lock (Y=namespace)',
'PZ','Library cache pin instance lock (Z=namespace)',
'QA','Row cache instance lock (A=cache)',
'QB','Row cache instance lock (B=cache)',
'QC','Row cache instance lock (C=cache)',
'QD','Row cache instance lock (D=cache)',
'QE','Row cache instance lock (E=cache)',
'QF','Row cache instance lock (F=cache)',
'QG','Row cache instance lock (G=cache)',
'QH','Row cache instance lock (H=cache)',
'QI','Row cache instance lock (I=cache)',
'QJ','Row cache instance lock (J=cache)',
'QL','Row cache instance lock (K=cache)',
'QK','Row cache instance lock (L=cache)',
'QM','Row cache instance lock (M=cache)',
'QN','Row cache instance lock (N=cache)',
'QO','Row cache instance lock (O=cache)',
'QP','Row cache instance lock (P=cache)',
'QQ','Row cache instance lock (Q=cache)',
'QR','Row cache instance lock (R=cache)',
'QS','Row cache instance lock (S=cache)',
'QT','Row cache instance lock (T=cache)',
'QU','Row cache instance lock (U=cache)',
'QV','Row cache instance lock (V=cache)',
'QW','Row cache instance lock (W=cache)',
'QX','Row cache instance lock (X=cache)',
'QY','Row cache instance lock (Y=cache)',
'QZ','Row cache instance lock (Z=cache)','????') Lockt
from V$LOCK L,
V$SESSION S,
SYS.USER$ U1,
SYS.OBJ$ T1
where L.SID = S.SID
and T1.OBJ# = decode(L.ID2,0,L.ID1,1)
and U1.USER# = T1.OWNER#
and S.TYPE != 'BACKGROUND'
order by 1,2,5
/set pagesize 60
set linesize 132
select s.username username,
a.sid sid,
a.owner||'.'||a.object object,
s.lockwait,
t.sql_text SQL
from v$sqltext t,
v$session s,
v$access a
where t.address=s.sql_address
and t.hash_value=s.sql_hash_value
and s.sid = a.sid
and a.owner != 'SYS'
and upper(substr(a.object,1,2)) != 'V$'
/clear columns
clear computes
clear breaks
set linesize 240
set pagesize 40
column sid format 99999 heading "SID"
column locktype format A9 heading "Lock Type"
column lockreq format A9 heading "Lock |Requested"
column lockheld format A9 heading "Lock Held"
column timeheld format 9999999 heading "Time Held|(minutes)"
column block format a5 heading "Block"
select /* RULE */ l.sid sid,
decode(l.type,'TM','DML','TX','Trans','UL','User',l.type) locktype,
decode(l.request,0,'None',1,'Null',2,'Row-S',3,'Row-X',4,'Share',5,'S/Row-X',6,'Exclusive') lockreq,
decode(l.lmode,0,'None',1,'Null',2,'Row-S',3,'Row-X',4,'Share',5,'S/Row-X',6,'Exclusive') lockheld,
l.ctime/60 timeheld,
decode(l.block,0,'No',1,'Yes') block
from gv$lock l
where l.request != 0 or l.block != 0
order by l.id1, l.lmode desc, l.ctime desc