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GoldenGate复制单表开并行

发表于:2024-09-24 作者:千家信息网编辑
千家信息网最后更新 2024年09月24日,最近有几项业务下线,需要从一张表中删除6.8亿多条数据。想办法把数据删除掉了,但对应的ogg灾备端复制时有了的延迟,而且延迟的时间起来越长。对于表太多造成的延迟可以把所有表分为多个组来做复制,于是想复
千家信息网最后更新 2024年09月24日GoldenGate复制单表开并行

最近有几项业务下线,需要从一张表中删除6.8亿多条数据。想办法把数据删除掉了,但对应的ogg灾备端复制时有了的延迟,而且延迟的时间起来越长。

对于表太多造成的延迟可以把所有表分为多个组来做复制,于是想复制进程是否可以对单表复制开并行。上网查到了相关的资料,可以使用@RANGE函数对单表作表内的拆分,通过对表上主键列作hash算法将该表上发生的变更均分到多个replicat上来降低单个replicat组件的负载。

动手实验一下:

ogg搭建过程不再重复,从网上就可以查到。

实验过程:模拟在源端对表scott.emp1做大量的dml操作,复制进程出现延迟,在目标端对复制表scott.emp1开并行3个进程。

源端插入数据:

SQL> insert into scott.emp1 select * from scott.emp;14 rows created.SQL> commit;Commit complete.SQL> insert into scott.emp1 select * from scott.emp1;14 rows created.SQL> /28 rows created.SQL> /.......SQL> /1835008 rows created.SQL> commit;Commit complete.SQL> select count(*) from scott.emp1;  COUNT(*)----------   3670016

目标端有延迟

GGSCI (rhel5) 15> info allProgram     Status      Group       Lag           Time Since ChkptMANAGER     RUNNING                                           REPLICAT    RUNNING     REPTAB      00:09:08      00:00:04

停掉复制进程

拆分复制进程,对表scott.emp1分三个进程复制

#源复制进程

GGSCI (rhel5) 23> view params reptabreplicat reptabSETENV (NLS_LANG="AMERICAN_AMERICA.ZHS16GBK")SETENV (ORACLE_SID="orcl")userid ogg,password 123456reperror default,discardassumetargetdefsdiscardfile /goldengate/dirrpt/reptab.dsc,append,megabytes 1024gettruncatesdynamicresolutionmap scott.emp1, target scott.emp1 ;map scott.emp, target scott.emp ;

源进程修改为

map scott.emp1, target scott.emp1 ,FILTER(@RANGE(1,3));

多复制出两个参数文件:

GGSCI (rhel5) 1> view params reptab02replicat reptab02SETENV (NLS_LANG="AMERICAN_AMERICA.ZHS16GBK")SETENV (ORACLE_SID="orcl")userid ogg,password 123456reperror default,discardassumetargetdefsdiscardfile /goldengate/dirrpt/reptab.dsc,append,megabytes 1024gettruncatesdynamicresolutionmap scott.emp1, target scott.emp1 ,FILTER (@RANGE(2,3));GGSCI (rhel5) 2> view params reptab03replicat reptab03SETENV (NLS_LANG="AMERICAN_AMERICA.ZHS16GBK")SETENV (ORACLE_SID="orcl")userid ogg,password 123456reperror default,discardassumetargetdefsdiscardfile /goldengate/dirrpt/reptab.dsc,append,megabytes 1024gettruncatesdynamicresolutionmap scott.emp1, target scott.emp1 ,FILTER (@RANGE(3,3));

添加两个复制进程,extseqno和extrba与源进程一致

GGSCI (rhel5) 9> info reptabREPLICAT   REPTAB    Last Started 2017-05-05 16:18   Status ABENDEDCheckpoint Lag       00:09:08 (updated 00:09:38 ago)Log Read Checkpoint  File ./dirdat/tl000003                     2017-05-05 16:09:11.000187  RBA 194186157                     GGSCI (rhel5) 10> add replicat reptab02, exttrail ./dirdat/tl,extseqno 3 extrba 194186157,checkpointtable ogg.checkpointREPLICAT added.GGSCI (rhel5) 11> add replicat reptab03, exttrail ./dirdat/tl,extseqno 3 extrba 194186157,checkpointtable ogg.checkpointREPLICAT added.

启动复制进程

GGSCI (rhel5) 12> start reptab*Sending START request to MANAGER ...REPLICAT REPTAB startingSending START request to MANAGER ...REPLICAT REPTAB02 startingSending START request to MANAGER ...REPLICAT REPTAB03 starting

查看数据库里ogg对应的会话

SQL> select module,sql_id from v$session where username='OGG';MODULE                                                                                                                                           SQL_ID------------------------------------------------------------------------------------------------------------------------------------------------ ---------------------------------------OGG-REPTAB03-OPEN_DATA_SOURCE                                                                                                                    1cxrusnmn01hzOGG-REPTAB-OPEN_DATA_SOURCE                                                                                                                      1cxrusnmn01hzOGG-REPTAB02-OPEN_DATA_SOURCE                                                                                                                    1cxrusnmn01hzSQL> select sql_text from v$sqlarea where sql_id='1cxrusnmn01hz';SQL_TEXT--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------INSERT INTO "SCOTT"."EMP1" ("EMPNO","ENAME","JOB","MGR","HIREDATE","SAL","COMM","DEPTNO") VALUES (:a0,:a1,:a2,:a3,:a4,:a5,:a6,:a7)

可以看到出现了三个会话,都是对应的对表scott.emp1的插入语句。也就是说实现了对scott.emp1表的并行复制。


MOS上也有相关的文档介绍相应的功能,文档:1320133.1和1512633.1

参考:blog.itpub.net/15187685/viewspace-1219731/


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