如何解决Oracle GoldenGate 没有主键的问题？

本站文章除注明转载外，均为本站原创： 转载自love wife love life —Roger 的Oracle技术博客 本文链接地址: 如何解决Oracle GoldenGate 没有主键的问题？ 针对没有主键的情况，GoldenGate大概提供了3种方案，大致如下： 1、默认使用所有列当主键，通过keyco

本站文章除注明转载外，均为本站原创： 转载自love wife & love life —Roger 的Oracle技术博客

本文链接地址: 如何解决Oracle GoldenGate 没有主键的问题？

针对没有主键的情况，GoldenGate大概提供了3种方案，大致如下：

1、默认使用所有列当主键，通过keycols来实现，这种其实存在一定的问题，在这次的项目中直接否定。
2、通过在源端表中添加ogg_key_id列的方式来实现，这可能会影响应用，因此也直接否定。
3、通过在目标端的表中添加rowid类型的伪列，来实现。通过测试，发现这种相对靠谱，如下是我的测试过程.

我这里测试的ogg抽取9208 Dataguard standby,同步到10205的例子。另外，我们这里9i的环境和10g环境均在同一个主机.

1、源端

说明：这里我模拟的是9i环境超过32列的情况.

—创建测试表

SQL> conn roger/rogerConnected.SQL> create table t_ALL_TABLES as select * from sys.ALL_TABLES where 1=2;Table created.

—源端OGG配置

GGSCI (killdb.com) 2> view param ext_stdextract ext_std userid ggs@killdb,password ggs tranlogoptions archivedlogonly tranlogoptions altarchivelogdest /home/ora9/arch_s exttrail /home/ora9/ggs/dirdat/ra discardfile ./dirrpt/exta.dsc,append, megabytes 500 fetchoptions USEROWID table roger.t_all_tables, tokens (TKN-ROWID = @GETENV ("RECORD", "rowid")) keycols (owner) ; table roger.t_buffer;GGSCI (killdb.com) 3> view param dp1EXTRACT dp1RMTHOST 192.168.109.12, MGRPORT 7809 TCPBUFSIZE 5000000PASSTHRURMTTRAIL  ./dirdat/r1NUMFILES 3000TABLE roger.*;GGSCI (killdb.com) 5> dblogin userid ggs@killdb,password ggsSuccessfully logged into database.GGSCI (killdb.com) 6> add trandata roger.t_all_Tables cols(owner) nokey2014-12-17 01:49:59  WARNING OGG-00869  No unique key is defined for table T_ALL_TABLES. All viable columns will be used to represent the key, but may not guarantee uniqueness.  KEYCOLS may be used to define the key.Logging of supplemental redo data enabled for table ROGER.T_ALL_TABLES.

2. 目标端

—创建测试表

www.killdb.com>create table t_all_tables as select * from sys.all_tables where 1=2;Table created.www.killdb.com>alter table t_all_Tables drop column STATUS ;Table altered.www.killdb.com>alter table t_all_Tables drop column DROPPED;Table altered.www.killdb.com>alter table t_all_tables add (row_id rowid);Table altered.www.killdb.com> alter table roger.t_all_Tables add constraint t_all_tables_pk unique (row_id) enable;Table altered.

—目标端OGG配置

GGSCI (killdb.com) 2> view param rep6replicat rep6userid  ggs@Roger,password AADAAAAAAAAAAADAKHEJYIFGVAKDPFZBGDFJNEQBBJRISJAAOCHHZEWCEFTCRIRCJDSHUHAJZBFDZEWC,encryptkey kasaur_keyreperror default, discarddiscardfile ./dirrpt/rep6.dsc, append, megabytes 50handlecollisionsassumetargetdefs----allownoopupdatesnumfiles 3000map roger.t_buffer, target roger.t_buffer;map roger.t_all_tables , target roger.t_all_tables colmap (usedefaults, row_id = @token ("TKN-ROWID")) keycols (row_id);

3. 启动进程

–源端

GGSCI (killdb.com) 5> info allProgram     Status      Group       Lag           Time Since ChkptMANAGER     RUNNINGEXTRACT     RUNNING     DP1         00:00:00      00:00:07EXTRACT     RUNNING     EXT_STD     00:00:00      00:00:07

—目标端

GGSCI (killdb.com) 3> info allProgram     Status      Group       Lag at Chkpt  Time Since ChkptMANAGER     RUNNINGJAGENT      STOPPEDEXTRACT     ABENDED     DP1         00:00:00      568:19:49EXTRACT     ABENDED     EXT1        00:00:00      309:16:06REPLICAT    STOPPED     REP5        00:00:00      596:25:54REPLICAT    RUNNING     REP6        00:00:00      00:00:02

4. 源端插入测试数据

模拟insert：
–源端

SQL> insert into t_all_Tables select * from sys.all_Tables where rownum  commit;Commit complete.SQL> alter system switch logfile;System altered.SQL>

—-目标端

www.killdb.com>select count(1) from t_all_Tables;COUNT(1)---------- 10www.killdb.com>select owner,table_name,row_id from t_all_Tables;OWNER                          TABLE_NAME                     ROW_ID------------------------------ ------------------------------ ------------------SYS                            SEG$                           AAAH3QAABAAAV0yAAASYS                            CLU$                           AAAH3QAABAAAV0yAABSYS                            OBJ$                           AAAH3QAABAAAV0yAACSYS                            FILE$                          AAAH3QAABAAAV0yAADSYS                            COL$                           AAAH3QAABAAAV0yAAESYS                            CON$                           AAAH3QAABAAAV0yA<mark style="color:transparent">本文来源gaodaimacom搞#^代%!码网@</mark>AFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ10 rows selected.

模式delete：

–源端

SQL> delete from t_all_tables where rownum  commit;Commit complete.SQL> alter system switch logfile;System altered.SQL> select count(1) from t_all_tables;COUNT(1)---------- 6SQL> select owner,table_name,rowid from t_all_tables;OWNER                          TABLE_NAME                     ROWID------------------------------ ------------------------------ ------------------SYS                            COL$                           AAAH3QAABAAAV0yAAESYS                            CON$                           AAAH3QAABAAAV0yAAFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ6 rows selected.

—目标端：

www.killdb.com>select count(1) from t_all_Tables;COUNT(1)---------- 6www.killdb.com>select owner,table_name,row_id from t_all_Tables;OWNER                          TABLE_NAME                     ROW_ID------------------------------ ------------------------------ ------------------SYS                            COL$                           AAAH3QAABAAAV0yAAESYS                            CON$                           AAAH3QAABAAAV0yAAFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ6 rows selected.www.killdb.com>

模拟update：

—源端：

SQL> select owner,table_name,rowid from t_all_tables;OWNER                          TABLE_NAME                     ROWID------------------------------ ------------------------------ ------------------SYS                            COL$                           AAAH3QAABAAAV0yAAESYS                            CON$                           AAAH3QAABAAAV0yAAFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ6 rows selected.SQL> update t_all_tables set owner='killdb.com' where table_name='COL$';1 row updated.SQL> update t_all_tables set owner='killdb.com' where rowid='AAAH3QAABAAAV0yAAF';1 row updated.SQL> commit;Commit complete.SQL> alter system switch logfile;System altered.SQL> select owner,table_name,rowid from t_all_tables;OWNER                          TABLE_NAME                     ROWID------------------------------ ------------------------------ ------------------killdb.com                     COL$                           AAAH3QAABAAAV0yAAEkilldb.com                     CON$                           AAAH3QAABAAAV0yAAFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ6 rows selected.

–目标端：

www.killdb.com> select owner,table_name,row_id from t_all_Tables;OWNER                          TABLE_NAME                     ROW_ID------------------------------ ------------------------------ ------------------killdb.com                     COL$                           AAAH3QAABAAAV0yAAEkilldb.com                     CON$                           AAAH3QAABAAAV0yAAFSYS                            PROXY_DATA$                    AAAH3QAABAAAV0yAAGSYS                            USER$                          AAAH3QAABAAAV0yAAHSYS                            IND$                           AAAH3QAABAAAV0yAAISYS                            FET$                           AAAH3QAABAAAV0yAAJ6 rows selected.www.killdb.com>

我们可以看到ogg完全是可以支持利用构造rowid伪列的方式来解决没有主键的问题。 然而这种方法
也有一个很大的问题：迁移之后，新环境中的row_id 伪列需要进行drop，这个drop的动作是非常坑爹的。

例如我们客户这里的系统，均为2.5TB以上的，最大12TB的库，那么drop column就疯掉了。

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