1.查看是否有死锁
select * from v$lock where block=1
查出锁表语句的 sid 后，可通过如下命令查询对应的 sql：
–根据 sid 查出 sql
select username, sql_text, machine, osuser
from v$session a, v$sqltext_with_newlines b
where DECODE(a.sql_hash_value, 0, prev_hash_value, sql_hash_value) =
b.hash_value
and a.sid = &sid
order by piece;
或
select username, sql_text, machine, osuser
from v$session a, v$sql b
where DECODE(a.sql_hash_value, 0, prev_hash_value, sql_hash_value) =
b.hash_value
and a.sid = &sid
2.查看当前是否有锁表语句
select * from v$session t1, v$locked_object t2 where t1.sid = t2.SESSION_ID;
3.查看当前被锁对象（非死锁）
select b.owner, b.object_name, a.session_id, a.locked_mode
from v$locked_object a, dba_objects b
where b.object_id = a.OBJECT_ID;
或
SELECT l.session_id sid,
s.serial#,
l.locked_mode 锁模式,
l.oracle_username 登录用户,
l.os_user_name 登录机器用户名,
s.machine 机器名,
s.terminal 终端用户名,
o.object_name 被锁对象名,
s.logon_time 登录数据库时间
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid, s.serial#;
或
SELECT a.sid, a.serial#, a.username, c.os_user_name
, a.program, a.logon_time, a.machine, a.terminal
, b.object_id, substr(b.object_name,1,40) object_name
, DECODE(c.locked_mode,1, 'No Lock',
2, 'Row Share',
3, 'Row Exclusive',
4, 'Shared Table',
5, 'Shared Row Exclusive',
6, 'Exclusive') locked_mode
from v$session a, dba_objects b, v$locked_object c
where a.sid = c.session_id
and b.object_id = c.object_id;
或
SELECT l.session_id sid,
s.serial#,
l.locked_mode 锁模式,
l.oracle_username 登录oracle用户,
l.os_user_name 登录OS用户名,
--s.username,
s.status,
s.schemaname,
s.machine 机器名,
s.terminal 终端用户名,
s.program,
s.type,
s.logon_time 登录数据库时间,
s.seq#,
s.event,
o.object_type,
o.object_name 被锁对象名,
c.ctime "被锁时间(S)"
FROM v$locked_object l, all_objects o, v$session s ,v$lock c
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
AND l.session_id = c.sid
ORDER BY sid, s.serial#;
或
SELECT l.sid "会话ID",
s.serial# "会话序列号",
p.spid "会话进程号",
l.type "锁类型",
s.username "所属用户",
s.machine "客户端",
o.object_name "被锁对象",
o.object_type "被锁对象类型",
l.ctime "被锁时间(S)"
FROM v$lock l, -- addr
v$session s, -- saddr
dba_objects o, -- object_id
v$process p -- addr
WHERE s.sid = l.sid
AND o.object_id = l.id1
AND p.addr = s.paddr
AND l.type IN ('TM', 'TX') -- 只需要关注 TM / TX 锁即可
-- AND s.username = ''
-- AND l.sid=768
-- AND l.block=1
;
或
SELECT /*+ rule */
S.USERNAME,
DECODE(L.TYPE, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) LOCK_LEVEL,
Decode(L.LMode,0,'[0] none',
1,'[1] null 空',
2,'[2] Row-S 行共享(RS)：共享表锁，sub share ',
3,'[3] Row-X 行独占(RX)：用于行的修改，sub exclusive ',
4,'[4] Share 共享锁(S)：阻止其他DML操作，share',
5,'[5] S/Row-X 共享行独占(SRX)：阻止其他事务操作，share/sub exclusive ',
6,'[6] exclusive 独占(X)：独立访问使用，exclusive ',
'['||L.LMode||'] Other Lock') LockMode,
O.OWNER,
O.OBJECT_NAME,
O.OBJECT_TYPE,
S.SID,
S.SERIAL#,
S.TERMINAL,
S.MACHINE,
S.PROGRAM,
S.OSUSER,
S.sql_address,
S.sql_hash_value
FROM V$SESSION S, V$LOCK L, DBA_OBJECTS O
WHERE L.SID = S.SID
AND L.ID1 = O.OBJECT_ID(+)
AND S.USERNAME IS NOT NULL
AND owner='WCINSTALL'
4.查看谁锁了谁
SELECT s1.username || '@' || s1.machine || ' ( SID=' || s1.sid ||
' ) is blocking ' || s2.username || '@' || s2.machine || ' ( SID=' ||
s2.sid || ' ) ' AS blocking_status
FROM v$lock l1, v$session s1, v$lock l2, v$session s2
WHERE s1.sid = l1.sid
AND s2.sid = l2.sid
AND l1.BLOCK = 1
AND l2.request > 0
AND l1.id1 = l2.id1
AND l2.id2 = l2.id2;
5.查看锁信息综合（简化版）
SELECT A.OWNER 用户名,
A.OBJECT_NAME 被锁对象名,
C.SID,
C.SERIAL#,
C.STATUS,
D.ctime "被锁时间(S)",
--B.XIDUSN 回滚段号,
--B.XIDSLOT 槽号,
--B.XIDSQN 序列号,
--B.SESSION_ID 锁表SESSION_ID,
--B.ORACLE_USERNAME 锁表Oracle用户名,
D.type 锁类型,
decode(D.type,'XR','NULL','RS','SS(Row-S)','CF','SS(Row-S)','TM','TABLE LOCK','PW','TABLE LOCK','TO','TABLE LOCK','TS',
'TABLE LOCK','RT','ROW LOCK','TX','ROW LOCK','MR','S(Share)',NULL) 锁定方式,
C.MACHINE,
--C.TERMINAL 机器名,
B.OS_USER_NAME 系统用户名,
--B.PROCESS 系统进程id,
DECODE(C.STATUS,'INACTIVE','不活动','ACTIVE','活动') 活动情况,
--C.SERVER,
C.PROGRAM 连接方式,
C.LOGON_TIME,
E.sql_text
--,'alter system kill session '''||C.SID||','||C.SERIAL#||''''
FROM ALL_OBJECTS A,
V$LOCKED_OBJECT B,
v$SESSION C,
v$lock D,
v$sql E
WHERE ( A.OBJECT_ID = B.OBJECT_ID )
AND (B.PROCESS = C.PROCESS )
AND C.sid = d.sid
AND B.LOCKED_MODE = D.LMODE
AND DECODE(C.sql_hash_value, 0, prev_hash_value, sql_hash_value) =E.hash_value
ORDER BY 6 desc;
6.查看锁信息综合
SELECT A.OWNER 用户名,
A.OBJECT_NAME 被锁对象名,
C.SID,
C.SERIAL#,
C.STATUS,
D.ctime 被锁时间,
B.XIDUSN 回滚段号,
B.XIDSLOT 槽号,
B.XIDSQN 序列号,
B.SESSION_ID 被锁SESSION_ID,
B.ORACLE_USERNAME 被锁Oracle用户名,
D.type 锁类型,
decode(D.type,'XR','NULL','RS','SS(Row-S)','CF','SS(Row-S)','TM','TABLE LOCK','PW','TABLE LOCK','TO','TABLE LOCK','TS',
'TABLE LOCK','RT','ROW LOCK','TX','ROW LOCK','MR','S(Share)',NULL) 锁定方式,
C.MACHINE 用户组,
C.TERMINAL 机器名,
B.OS_USER_NAME 系统用户名,
B.PROCESS 系统进程id,
--DECODE(C.STATUS,'INACTIVE','不活动','ACTIVE','活动') 活动情况,
C.SERVER,
C.PROGRAM 连接方式,
C.LOGON_TIME,
E.sql_text
--,'alter system kill session '''||C.SID||','||C.SERIAL#||''''
FROM ALL_OBJECTS A,
V$LOCKED_OBJECT B,
v$SESSION C,
v$lock D,
v$sql E
WHERE ( A.OBJECT_ID = B.OBJECT_ID )
AND (B.PROCESS = C.PROCESS )
AND C.sid = d.sid
AND B.LOCKED_MODE = D.LMODE
AND DECODE(C.sql_hash_value, 0, prev_hash_value, sql_hash_value) =E.hash_value
--ORDER BY 1,2;
ORDER BY 6;
查出阻塞链条
select *
from (select a.inst_id, a.sid, a.serial#,
a.sql_id,
a.event,
a.status,
connect_by_isleaf as isleaf,
sys_connect_by_path(a.SID||'@'||a.inst_id, ' <- ') tree,
level as tree_level
from gv$session a
start with a.blocking_session is not null
connect by (a.sid||'@'||a.inst_id) = prior (a.blocking_session||'@'||a.blocking_instance))
where isleaf = 1
order by tree_level asc;
7.查看当前会话中引起行锁竞争的语句
select sw.event,
sw.sid,
sw.p1,
sw.p2,
sw.p3,
s.ROW_WAIT_OBJ#,
s.ROW_WAIT_FILE#,
s.ROW_WAIT_BLOCK#,
s.ROW_WAIT_ROW#,
o.OWNER,
o.OBJECT_NAME,
o.OBJECT_ID,
o.DATA_OBJECT_ID,
o.OBJECT_TYPE,
st.sql_id,
st.sql_text
from v$session_wait sw, v$session s, dba_objects o, v$sql st
where sw.sid = s.sid
and o.object_id = s.ROW_WAIT_OBJ#
and (st.sql_id = s.sql_id or st.sql_id = s.prev_sql_id)
and sw.event = 'enq: TX - row lock contention';
8.kill lock语句
ALTER SYSTEM KILL SESSION ’sid,serial#’;
--例：
--ALTER SYSTEM KILL SESSION '2210,2769';
–查看被锁对象并生成 kill 语句
SELECT c.owner,
c.object_name,
c.object_type,
b.sid,
b.serial#,
b.inst_id,
b.status,
b.osuser,
b.machine,
'alter system kill session ''' || b.sid || ',' || b.serial# || ',@' ||b.inst_id || ''';'
--'alter system kill session ''' || b.sid || ',' || b.serial# || ',@' ||b.inst_id || ''';' RAC架构
FROM gv$locked_object a, gv$session b, dba_objects c
WHERE b.sid = a.session_id
AND a.object_id = c.object_id
and a.inst_id = b.inst_id;
或
SELECT 'alter system kill session ''' || SID || ',' || s.serial# || ',@' ||
inst_id || ''';',
sid,
username,
serial#,
process,
NVL(sql_id, 0),
sql_address,
blocking_session,
wait_class,
event,
p1,
p2,
p3,
seconds_in_wait
FROM gv$session s
WHERE blocking_session_status = 'VALID'
OR sid IN (SELECT blocking_session
FROM gv$session
WHERE blocking_session_status = 'VALID');
–查看会话阻塞并生成kill语句
SELECT vs.username,
vs.osuser,
vh.sid locking_sid,
vs.status status,
vs.module module,
vs.program program_holding,
jrh.job_name,
vsw.username,
vsw.osuser,
vw.sid waiter_sid,
vsw.program program_waiting,
jrw.job_name,
'alter system kill session ' || '''' || vh.sid || ',' || vs.serial# ||
''';' "Kill_Command"
FROM v$lock vh,
v$lock vw,
v$session vs,
v$session vsw,
dba_scheduler_running_jobs jrh,
dba_scheduler_running_jobs jrw
WHERE (vh.id1, vh.id2) IN (SELECT id1, id2
FROM v$lock
WHERE request = 0
INTERSECT
SELECT id1, id2
FROM v$lock
WHERE lmode = 0)
AND vh.id1 = vw.id1
AND vh.id2 = vw.id2
AND vh.request = 0
AND vw.lmode = 0
AND vh.sid = vs.sid
AND vw.sid = vsw.sid
AND vh.sid = jrh.session_id(+)
AND vw.sid = jrw.session_id(+);
–查杀根锁sql(为了防止查错dba的会话，多了一个过滤sqlplus的进程的条件)
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SELECT distinct
'alter system kill session '''||A.sid||','||A.serial#||',@'||A.inst_id||''' immediate;'
FROM GV$SESSION A,GV$SESSION B
WHERE A.SID=B.FINAL_BLOCKING_SESSION
AND A.USERNAME IS NOT NULL
AND A.INST_ID=B.INST_ID
AND A.AUDSID<>B.AUDSID
--and a.program not like '%sqlplus%' and
;
–生成 kill 掉大于300秒的会话语句
SELECT 'kill -9 ' || p.spid,
s.username,
'alter system kill session ''' || SID || ',' || s.serial# || ''';'
FROM v$session s, v$process p
WHERE s.paddr = p.addr(+)
AND s.SID IN (select sid
from v$sql_monitor
where status = 'EXECUTING'
and elapsed_time / 1000000 > 300
and username in ('MEHMET', 'SALIH'));
9.查看执行时间较久的SQL
SELECT USERNAME,
SID,
OPNAME,
ROUND(SOFAR * 100 / TOTALWORK, 0) || '%' AS PROGRESS,
TIME_REMAINING,
SQL_TEXT
FROM V$SESSION_LONGOPS, V$SQL
WHERE TIME_REMAINING <> 0
AND SQL_ADDRESS = ADDRESS
AND SQL_HASH_VALUE = HASH_VALUE;
9.查看历史阻塞会话和锁信息
select v.sql_text, v.sql_fulltext, sub.*
from v$sql v,
(select sample_time,
s.sql_id sql_id,
session_state,
blocking_session,
owner || '.' || object_name || ':' ||
nvl(subobject_name, '-') obj_name,
s.program,
s.module,
s.machine
from dba_hist_active_sess_history s, dba_objects o
where sample_time between
to_date('27/02/2019 07:30:02', 'DD/MM/YYYY HH24:MI:SS') and
to_date('28/02/2019 15:10:02', 'DD/MM/YYYY HH24:MI:SS')
and event = 'enq: TX - row lock contention'
and o.data_object_id = s.current_obj#
order by 1 desc) sub
where sub.sql_id = v.sql_id;
10.从历史会话中查看引起行锁竞争的语句
select ash.sample_time,
ash.instance_number,
ash.user_id,
u.username,
ash.session_id,
ash.session_serial#,
ash.current_obj#,
o.owner,
o.object_name,
o.object_type,
ash.sql_id,
ash.sql_opname,
ash.wait_class,
ash.program,
ash.module,
ash.blocking_session_status,
ash.blocking_session,
ash.blocking_session_serial#,
ash.blocking_inst_id,
st.inst_id,
st.sql_text
from dba_hist_active_sess_history ash,
dba_users u,
dba_objects o,
gv_$sql st
where to_char(ash.sample_time, 'YYYY-MM-DD hh24:mi:ss') between '2022-03-22 13:30:00' and '2022-03-22 15:30:00'
and ash.time_waited > 0
and ash.session_state = 'WAITING'
and ash.user_id = u.user_id
and ash.current_obj# = o.object_id
and st.sql_id = ash.sql_id
and ash.event = 'enq: TX - row lock contention';
11.查看RAC环境的会话阻塞
SELECT DISTINCT S1.USERNAME || '@' || S1.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S1.SID || ' ) IS BLOCKING ' ||
S2.USERNAME || '@' || S2.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S2.SID || ' ) ' AS BLOCKING_STATUS
FROM GV$LOCK L1, GV$SESSION S1, GV$LOCK L2, GV$SESSION S2
WHERE S1.SID = L1.SID
AND S2.SID = L2.SID
AND S1.INST_ID = L1.INST_ID
AND S2.INST_ID = L2.INST_ID
AND L1.BLOCK > 0
AND L2.REQUEST > 0
AND L1.ID1 = L2.ID1
AND L1.ID2 = L2.ID2;
–RAC环境的会话阻塞和对象信息
SELECT DISTINCT S1.USERNAME || '@' || S1.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S1.SID || ' ) IS BLOCKING ' ||
S2.USERNAME || '@' || S2.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S2.SID || ' ) OBJ_ID:' || L1.ID1 ||
' OBJ_NAME:' || O.OBJECT_NAME AS BLOCKING_STATUS
FROM GV$LOCK L1, GV$SESSION S1, GV$LOCK L2, GV$SESSION S2, DBA_OBJECTS O
WHERE S1.SID = L1.SID
AND S2.SID = L2.SID
AND S1.INST_ID = L1.INST_ID
AND S2.INST_ID = L2.INST_ID
AND L1.ID1 = OBJECT_ID
AND L1.ID1 = O.OBJECT_ID
AND L1.BLOCK > 0
AND L2.REQUEST > 0
AND L1.ID1 = L2.ID1
AND L1.ID2 = L2.ID2;
–查看RAC环境的会话阻塞，针对某个具体的对象
SELECT DISTINCT S1.USERNAME || '@' || S1.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S1.SID || ' ) IS BLOCKING ' ||
S2.USERNAME || '@' || S2.MACHINE || ' ( INST=' ||
S1.INST_ID || ' SID=' || S2.SID || ' ) OBJ_ID:' || L1.ID1 ||
' OBJ_NAME:' || O.OBJECT_NAME AS BLOCKING_STATUS
FROM GV$LOCK L1, GV$SESSION S1, GV$LOCK L2, GV$SESSION S2, DBA_OBJECTS O
WHERE S1.SID = L1.SID
AND S2.SID = L2.SID
AND S1.INST_ID = L1.INST_ID
AND S2.INST_ID = L2.INST_ID
AND L1.ID1 = OBJECT_ID
AND L1.ID1 = O.OBJECT_ID
AND L1.BLOCK > 0
AND L2.REQUEST > 0
AND L1.ID1 = L2.ID1
AND L1.ID2 = L2.ID2
AND object_id in (SELECT OBJECT_ID
FROM DBA_OBJECTS
WHERE OWNER = 'XXX'
AND OBJECT_NAME = 'XXX');
参考文章：
https://www.cnblogs.com/annez/p/15380150.html
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Oracle 锁（lock）详解