SQL> select * from v$locked_object where session_id='42';
回滚段号 槽号 事务序列号
XIDUSN XIDSLOT XIDSQN OBJECT_ID SESSION_ID ORACLE_USERNAME OS_USER_NAME PROCESS LOCKED_MODE
---------- ---------- ---------- ---------- ---------- ------------------------------ ------------------------------ ------------------------ -----------
2 4 1350 77289 42 SCOTT oracle 5114 3
SQL> select sid,type,id1,id2 from v$lock where sid=27;
SID TYPE ID1 ID2
---------- ---- ---------- ----------
27 TX 131076 1350
27 AE 100 0
27 TM 77289 0
SYS@PROD>select trunc(131076/65536) xidusn,mod(131076,65536) xidslot from dual;
XIDUSN XIDSLOT
---------- ----------
2 4
SQL> select * from v$lock where id2='1350';
ADDR KADDR SID TYPE ID1 ID2 LMODE REQUEST CTIME BLOCK
-------- -------- ---------- ---- ---------- ---------- ---------- ---------- ---------- ----------
51EF24E4 51EF2510 27 TX 131076 1350 0 6 1537 0
50BA4138 50BA4178 42 TX 131076 1350 6 0 1565 1
lmode:会话保持的锁的模式。
0=None;
1=Null ;
2=Row-S (SS,行级共享锁,其他对象只能查询这些数据行),sql操作有select for update、lock for update、lock row share;
3=Row-X (SX,行级排它锁,在提交前不允许做DML操作),sql操作有insert、update、delete、lock row share;
4=Share(共享锁),sql操作有create index、lock share;
5=S/Row-X (SSX,共享行级排它锁),sql操作有lock share row exclusive;
6=Exclusive(排它锁),alter table、drop table、drop index、truncate table、look exclusive等DDL
SQL> select * from v$transaction where XIDUSN=2 and XIDSLOT=4 and XIDSQN=1350;
ADDR XIDUSN XIDSLOT XIDSQN UBAFIL UBABLK UBASQN UBAREC STATUS START_TIME START_SCNB START_SCNW START_UEXT START_UBAFIL START_UBABLK START_UBASQN START_UBAREC SES_ADDR FLAG SPACE RECURSIVE NOUNDO PTX NAME PRV_XIDUSN PRV_XIDSLT PRV_XIDSQN PTX_XIDUSN PTX_XIDSLT PTX_XIDSQN DSCN-B DSCN-W USED_UBLK USED_UREC LOG_IO PHY_IO CR_GET CR_CHANGE START_DATE DSCN_BASE DSCN_WRAP START_SCN DEPENDENT_SCN XID PRV_XID PTX_XID
-------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------------- -------------------- ---------- ---------- ---------- ------------ ------------ ------------ ------------ -------- ---------- ----- --------- ------ --- -------------------------------------------------------------------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------- ---------- ---------- ---------- ------------- ---------------- ---------------- ----------------
50BA4138 2 4 1350 3 150 360 31 ACTIVE 09/20/18 11:30:44 1434925 0 0 3 150
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