收到 短信，发现ogg进程挂了，通过查看ogg进程的日志文件，可以看到如下报错
OCI Error ORA-30036: unable to extend segment by 4 in undo tablespace 'UNDOTBS1' (status = 30036). INSERT INTO "Acc_VS1"."PR_GOODS_D" ("ID","PR_GOODS_D","LINE_CODE","W_CODE","BARC
ODE","PACKAGE_TYPE","OPERATING_TIME","CREATE_SITE_CODE","PR_GOODS_D","CREATE_USER","CREAT","UPDA","UPDATE_TIME","YN","MODIFY_TIME") VALUES (:a0,:a1,:a2,:a3,:a4,:a5,:a6,:a7,:a8,
:a9,:a10,:a11,:a12,:a13,:a14)
Aborting transaction on /ggs/dirdat/tg beginning at seqno 13706 rba 133861918
error at seqno 13706 rba 133861918
Problem replicating Acc_VS1.PR_GOODS_Dto Acc_VS1.PR_GOODS_D
Mapping problem with insert record (target format)...
可以发现是undo表空间满了，无法实现扩展导致ogg进程同步数据出现问题，那么我们需要查看为什么undo表空间会使用完了，是谁导致的，通过下面语句查看事物，可以发现可疑的事物，导致undo表空间满了，通过和研发沟通，通过先杀掉任务
select a.sid,
a.serial#,
a.user#,
a.username,
b.addr,
b.USED_UBLK,
b.USED_UREC,
b.START_TIME
from v$transaction b, v$session a
where /*b.addr in (select a.taddr from v$session a where a.sid = '') and*/ b.addr=a.taddr order by start_time
杀了任务后，undo表空间并没有回立刻释放，而是需要回滚任务，通过查看回滚任务，发现回滚速度太慢，如何加快回滚速度呢？通过修改参数来加快回滚速度
SYS@rep1> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string LOW
SYS@report1> alter system set FAST_START_PARALLEL_ROLLBACK =HIGH;
[oracle@report1 dirrpt]$ ps -ef|grep ora_p0 |wc -l
2
[oracle@report1 dirrpt]$ ps -ef|grep ora_p0 |wc -l
2
[oracle@report1 dirrpt]$ ps -ef|grep ora_p0 |wc -l
2
FAST_START_PARALLEL_ROLLBACK 参数并不会在所有情况下都会加速回滚，需要看情况，需要在系统资源使用比较低的情况下，cpu使用率低，可以加快回滚速度，如果系统压力比较大，如果开启此参数，只会降低回滚速度，导致系统资源使用更为紧张
看看系统回滚速度如何
SQL> select undoblockstotal "Total", undoblocksdone "Done", undoblockstotal-undoblocksdone
2 "ToDo",decode(cputime,0,'unknown',to_char(sysdate+(((undoblockstotal-undoblocksdone)
3 / (undoblocksdone / cputime)) / 86400),'yyyy-mm-dd hh24:mi:ss'))
4 "Estimated time to complete"，to_char(sysdate,'yyyy-mm-dd hh24:mi:ss')
5 from v$fast_start_transactions;
Total Done ToDo Estimated time to complete TO_CHAR(SYSDATE,'YYYY-MM-DDHH2
---------- ---------- ---------- -------------------------- ------------------------------
3815289 1021 3814268 2018-01-04 14:47:43 2018-01-03 21:09:14
SQL> /
Total Done ToDo Estimated time to complete TO_CHAR(SYSDATE,'YYYY-MM-DDHH2
---------- ---------- ---------- -------------------------- ------------------------------
3815289 3354 3811935 2018-01-04 16:44:24 2018-01-03 21:09:59
SQL> /
Total Done ToDo Estimated time to complete TO_CHAR(SYSDATE,'YYYY-MM-DDHH2
---------- ---------- ---------- -------------------------- ------------------------------
3815289 5459 3809830 2018-01-04 20:50:03 2018-01-03 21:10:59
HIGH回滚速度相对于LOW来说确实加快了很多，但是 等了3个小时，似乎预估计回滚还需要更长的时间，OGG进程不能等待太长时间，只能通过先扩展undo表空间的方式来解决此问题，等待事物回滚完成