這篇文章將為大家詳細(xì)講解有關(guān)ogg中extract如何拆分，小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，希望大家閱讀完這篇文章后可以有所收獲。

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ogg的extract的拆分方法
0.背景
OGG 在部署以后，隨著業(yè)務(wù)壓力的增大，可能需要增加多個(gè)group來處理數(shù)據(jù)同步，在這種情況下，就需要對(duì)原有的OGG 進(jìn)程拆分，同時(shí)也不能導(dǎo)致數(shù)據(jù)同步出現(xiàn)問題。
1. 停止extract進(jìn)程
GGSCI (ogg1) 2&get; stop ext1

2. 停止datapump進(jìn)程
這里要等到投遞進(jìn)程投遞完成才能停止，如果在沒有投遞完成的情況下停止會(huì)丟數(shù)據(jù)
GGSCI (ogg1) 4&get; info dpump
EXTRACT DPUMP Last Started 2014-03-27 20:00 Status RUNNING
Checkpoint Lag 00:00:00 (updated 00:00:02 ago)
Process ID 20746
Log Read Checkpoint File /u01/ggs/dirdat/lt000009
2014-03-27 20:01:36.000000 RBA 19719
多次執(zhí)行命令查看rba是否一致，如果一致說明投遞完成，那么就可以停止
GGSCI (ogg1) 7&get; stop dpump

3. 記錄extract檢查點(diǎn)
Extract檢查點(diǎn)包括：Recovery Checkpoint： Sequence 和RBA
                  Current Checkpoint ： Sequence 和RBA
Current Checkpoint Detail:
Read Checkpoint #1
  Oracle Redo Log
  Startup Checkpoint (starting position in the data source):
    Thread #: 1
    Sequence #: 53
    RBA: 25012752
    Timestamp: 2014-03-27 19:59:43.000000
    SCN: 0.2085381 (2085381)
    Redo File: /u01/app/oracle/oradata/dave/redo02.log
  Recovery Checkpoint (position of oldest unprocessed transaction in the data source):
    Thread #: 1
    Sequence #: 53
    RBA: 28138512
    Timestamp: 2014-03-27 20:10:52.000000
    SCN: 0.2086075 (2086075)
    Redo File: /u01/app/oracle/oradata/dave/redo02.log
  Current Checkpoint (position of last record read in the data source):
    Thread #: 1
    Sequence #: 53
    RBA: 28141568
    Timestamp: 2014-03-27 20:10:55.000000
    SCN: 0.2086077 (2086077)
    Redo File: /u01/app/oracle/oradata/dave/redo02.log
4. 修改原有相應(yīng)的參數(shù)文件，將拆分出的表從參數(shù)文件中刪除
ext1進(jìn)程
之前的
GGSCI (ogg1) 12&get; view param ext1
extract ext1
userid ggs@ogg1, password ggs
exttrail /u01/ggs/dirdat/lt
ddl include mapped objname sender.*;
table sender.*;
修改的
GGSCI (ogg1) 18&get; view param ext1
extract ext1
userid ggs@ogg1, password ggs
exttrail /u01/ggs/dirdat/lt
ddl include mapped objname sender.*;
table sender.dave1;
dpump進(jìn)程
之前的
GGSCI (ogg1) 13&get; view param dpump
extract dpump
userid ggs@ogg1, password ggs
rmthost 192.168.2.62, mgrport 7809
rmttrail /u01/ggs/dirdat/rt
passthru
table sender.*;
dynamicresolution
修改的
GGSCI (ogg1) 19&get; view param dpump
extract dpump
userid ggs@ogg1, password ggs
rmthost 192.168.2.62, mgrport 7809
rmttrail /u01/ggs/dirdat/rt
passthru
table sender.dave1;
dynamicresolution

5. 增加新的extract，datapump
5.1添加Extract 進(jìn)程
GGSCI (ogg1) 22&get; add extract ext3,tranlog, begin now
EXTRACT added.
GGSCI (ogg1) 23&get; add exttrail /u01/ggs/dirdat/E3, extract ext3
EXTTRAIL added.

5.2修改抽取進(jìn)程ext3參數(shù)：
GGSCI (ogg1) 26&get; view param ext3
extract ext3
userid ggs@ogg1, password ggs
exttrail /u01/ggs/dirdat/E3
ddl include mapped objname sender.*;
table sender.dave2;
5.3添加Pump 進(jìn)程
GGSCI (ogg1) 28&get; add extract pump3,exttrailsource /u01/ggs/dirdat/E3
EXTRACT added.
GGSCI (ogg1) 29&get; add rmttrail /u01/ggs/dirdat/E3, extract pump3,megabytes 10
RMTTRAIL added.
5.4配置Data Pump 參數(shù)：
GGSCI (gg1) 56&get; view params dpump
extract pump3
userid ggs@ogg1, password ggs
rmthost 192.168.2.62, mgrport 7809
rmttrail /u01/ggs/dirdat/E3
passthru
table sender.dave2;
dynamicresolution

6. 修改新增extract進(jìn)程的檢查點(diǎn)
檢查點(diǎn)為上面記錄的兩個(gè)檢查點(diǎn)：current read checkpoint 和 recovery checkpoint
6.1 修改current read checkpoint
GGSCI (ogg1) 34&get; alter ext3 extseqno 53, extrba 28141568[, thread n]  
這里是重點(diǎn) 
EXTRACT altered.  
6.2 修改recovery checkpoint
GGSCI (ogg1) 35&get; alter ext3 ioextseqno 53, ioextrba 28138512 [, thread n]

7. 確認(rèn)所有參數(shù)文件正確，啟動(dòng)進(jìn)程即可
GGSCI (ogg1) 37&get; start *   

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