Oracle八大性能视图之v$transaction
1、表结构SQL> desc v$transaction;
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
ADDR RAW(8)
XIDUSN NUMBER
XIDSLOT NUMBER
XIDSQN NUMBER
UBAFIL NUMBER
UBABLK NUMBER
UBASQN NUMBER
UBAREC NUMBER
STATUS VARCHAR2(16)
START_TIME VARCHAR2(20)
START_SCNB NUMBER
START_SCNW NUMBER
START_UEXT NUMBER
START_UBAFIL NUMBER
START_UBABLK NUMBER
START_UBASQN NUMBER
START_UBAREC NUMBER
SES_ADDR RAW(8)
FLAG NUMBER
SPACE VARCHAR2(3)
RECURSIVE VARCHAR2(3)
NOUNDO VARCHAR2(3)
PTX VARCHAR2(3)
NAME VARCHAR2(256)
PRV_XIDUSN NUMBER
PRV_XIDSLT NUMBER
PRV_XIDSQN NUMBER
PTX_XIDUSN NUMBER
PTX_XIDSLT NUMBER
PTX_XIDSQN NUMBER
DSCN-B NUMBER
DSCN-W NUMBER
USED_UBLK NUMBER
USED_UREC NUMBER
LOG_IO NUMBER
PHY_IO NUMBER
CR_GET NUMBER
CR_CHANGE NUMBER
START_DATE DATE
DSCN_BASE NUMBER
DSCN_WRAP NUMBER
START_SCN NUMBER
DEPENDENT_SCN NUMBER
XID RAW(8)
PRV_XID RAW(8)
PTX_XID RAW(8)
2、根据session> select * from v$transaction where addr in (select taddr from v$session where sid=&sid );
看下面这两个字段可以看到事务进行到什么程度了：
USED_UBLK
NUMBER
Number of undo blocks used
USED_UREC
NUMBER
Number of undo records used
重复查询这两个值，可以看到变化，可以估计事务的进度，尤其是长时间的回滚操作，当这两个值为0，回滚也就完成了。
如SQL语句如下：
select a.sid,
a.serial#,
a.user#,
a.username,
b.addr,
b.USED_UBLK,
b.USED_UREC
from v$transaction b, v$session a
where b.addr in (select a.taddr from v$session a where a.sid = &sid)
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