GGSCI (cndba) 65> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING EXTRACT RUNNING EXT1 00:00:00 00:00:09 EXTRACT RUNNING PUMP1 00:00:00 00:00:08 GGSCI (cndba) 66> stop ext1Sending STOP request to EXTRACT EXT1 ...Request processed.GGSCI (cndba) 67> stop pump1Sending STOP request to EXTRACT PUMP1 ...Request processed.GGSCI (cndba) 68> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING EXTRACT STOPPED EXT1 00:00:00 00:00:04 EXTRACT STOPPED PUMP1 00:00:00 00:00:01
GGSCI (cndba) 55> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING REPLICAT RUNNING REP1 00:00:00 00:00:08 GGSCI (cndba) 56> stop rep1Sending STOP request to REPLICAT REP1 ...Request processed.GGSCI (cndba) 57> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING REPLICAT STOPPED REP1 00:00:00 00:00:01
--源端SQL> select * from test1;no rows selected--目标端SQL> select * from test1;no rows selected
记住插入之前的时间2018-06-07 16:15:24,这个时间点很重要,extract 进程要从这个时间开始抽取SQL> insert into test1 select level,level||'t' from dual connect by level <= 100000;100000 rows created.SQL> commit;Commit complete.SQL> select count(*) from test1; COUNT(*)---------- 100000如果此时开启源端extract进程,目标端replicat,数据同步不会出现问题,现在的操作就是:1)结束当前的本地日志,重新开始一个日志2)从当前新生成的序列重新抓取
[root@www.cndba.cn dirdat]# lltotal 12drwxr-xr-x 2 root root 4096 Jun 7 15:47 backup-rw-rw-rw- 1 oracle oinstall 1405 Jun 7 16:11 et000000-rw-rw-rw- 1 oracle oinstall 1016 Jun 7 16:19 et000001可以看到当前tail文件是1号文件,重启的时候会自动变成2号文件。
GGSCI (cndba) 70> alter extract ext1 etrollover2018-06-07 16:33:40 INFO OGG-01520 Rollover performed. For each affected output trail of Version 10 or higher format, after starting the source extract, issue ALTER EXTSEQNO for that trail's reader (either pump EXTRACT or REPLICAT) to move the reader's scan to the new trail file; it will not happen automatically.EXTRACT altered.GGSCI (cndba) 71> alter extract ext1,thread 1,extseqno 2,extrba 0EXTRACT altered.GGSCI (cndba) 72> alter extract pump1 etrollover2018-06-07 16:34:26 INFO OGG-01520 Rollover performed. For each affected output trail of Version 10 or higher format, after starting the source extract, issue ALTER EXTSEQNO for that trail's reader (either pump EXTRACT or REPLICAT) to move the reader's scan to the new trail file; it will not happen automatically.EXTRACT altered.GGSCI (cndba) 73> alter extract pump1,thread 1,extseqno 2,extrba 0EXTRACT altered.
GGSCI (cndba) 74> ALTER EXTRACT ext1, TRANLOG, BEGIN 2018-06-07 16:15:24EXTRACT altered.
GGSCI (cndba) 58> start ext1Sending START request to MANAGER ...EXTRACT EXT1 startingGGSCI (cndba) 59> start pump1Sending START request to MANAGER ...EXTRACT PUMP1 startingGGSCI (cndba) 64> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING EXTRACT RUNNING EXT1 00:00:00 00:00:06 EXTRACT RUNNING PUMP1 00:00:00 00:00:01
可以看到目标端也生成了新的tail文件号,目标端从这个文件应用数据[root@www.cndba.cn dirdat]# lltotal 21484drwxr-xr-x 2 root root 4096 Jun 7 15:48 backup-rw-rw-rw- 1 oracle oinstall 1444 Jun 7 16:11 et000000-rw-rw-rw- 1 oracle oinstall 0 Jun 7 16:19 et000001-rw-rw-rw- 1 oracle oinstall 21989995 Jun 7 16:35 et000002
GGSCI (cndba) 74> alter REPLICAT rep1 extseqno 2, extrba 0REPLICAT altered.GGSCI (cndba) 75> start rep1Sending START request to MANAGER ...REPLICAT REP1 startingGGSCI (cndba) 76> info allProgram Status Group Lag at Chkpt Time Since ChkptMANAGER RUNNING REPLICAT RUNNING REP1 00:00:00 00:00:04
SQL> select count(1) from test1; COUNT(1)---------- 100000
--前滚重新生成一个新的队列文件alter extract xxx etrollover--从指定时间重新抓取(重新抓取数据前提:归档文件没有删除)ALTER EXTRACT xxx, TRANLOG, BEGIN 2010-12-31 08:00--重置抽取进程,本地文件序列号从0开始生成。alter extract ext1,extseqno 0,extrba 0--重置读取进程,重新从0号trial文件开始读取。alter replicat rep1,extseqno 0,extrba 0
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