全库级 stream复制：maintain_global方法

 rhel6.3,oracle 11203,全库级 stream复制：maintain_global方法,downstream capture

1.     准备工作

使用maintain_global来配置一个单向的downstream capture的全库复制,目标库已经在。

	源端（source database）	目标端(destination database)
Hostname	Rhel63db	Tan63rep
Db_name	Strmtan	Strmdest
Gblobal_name	Strmtan	Strmdest
Instance_name	Strmtan	Strmdest
Db_unique_name	Strmtan	Strmdest

 

1.1. 在所有的database上部署管理用户

应当创建一个新用户和表空间，不应用sys,system用户，system系统表空间。

表空间

SQL> create tablespace streamtbs datafile

    '/data01/apps/oracle/oradata/strmtan/streamtbs01.dbf' size 50m

    autoextend on maxsize unlimited segment space management auto;

将logminer的数据字典从system分离，防止撑满system表空间

SQL> execute dbms_logmnr_d.set_tablespace('streamtbs');

用户

SQL> create user strmadmin identified by strmadmin default tablespace streamtbs;

相关权限

SQL> grant dba to strmadmin;

1.   The DBA role is required for a user to create or altercapture processes, synchronous captures, and apply processes. When the user does not need to perform these tasks,DBA role can be revoked from the user.

用GRANT_ADMIN_PRIVILEGE给一些特有权限

BEGIN

  DBMS_STREAMS_AUTH.GRANT_ADMIN_PRIVILEGE(

    grantee          => 'strmadmin',   

    grant_privileges => TRUE);

END;

/

1.2. 配置网络连接和database links

网络配置已经做好，而且简单，不再做说明，只做database link部分

 

每个dblink必须用 streams administrator’s chema (就是前面创建的strmadmin)

 

源端（source database）:

SQL> conn strmadmin/strmadmin

create database link strmdest connect to strmadmin

identified by strmadmin using 'strmdest';

 

Database link created.

目标端（destination database）

SQL> conn strmadmin/strmadmin

create database link strmtan connect to strmadmin

identified by strmadmin using 'strmtan';

1.3. 保证两端archivelog模式

检查

SQL> conn /as sysdba

Connected.

SQL> archive log list

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            /u01/strmtan/arch1

Oldest online log sequence     1

Next log sequence to archive   2

1.4. 检查密码文件是否存在

源端和目标端都需要密码文件，目标端需要从源端拷贝。有了密码文件以及相应参数（remote_login_passwordfile）正确，就可以远程以sys用户登陆，此过程没有完成会影响日志文件的传输。

1.5. 设置初始化参数

所有库都需要改的

alter system set aq_tm_processes=2 scope=both;

alter system set global_names=true scope=both;

alter system set undo_retention=3600 scope=both;

alter system set job_queue_processes=10 scope=both;

alter system set parallel_max_servers=20 scope=both;

alter system set nls_date_format='YYYY-MM-DD HH24:MI:SS' scope=spfile;

alter system set streams_pool_size=100M scope=spfile;

alter system set shared_pool_size=100m scope=both;

alter system set open_links=4 scope=spfile;

alter system set LOG_ARCHIVE_DEST_STATE_2=enable scope=both;

alter system set timed_statistics= TRUE scope=spfile;

alter system set LOG_ARCHIVE_CONFIG='DG_CONFIG=(strmtan,strmdest)'  scope=both;

log_archive_dest_n

源端：

--real time log方式

Alter system set LOG_ARCHIVE_DEST_2='SERVICE=STRMDEST LGWR ASYNC OPTIONAL NOREGISTER VALID_FOR=(ONLINE_LOGFILE,PRIMARY_ROLE) DB_UNIQUE_NAME=STRMDEST'  scope=both;

 

目标端

alter system set log_archive_dest_1='LOCATION=/u01/strmdest/arch1/ MANDATORY VALID_FOR=(ONLINE_LOGFILE,PRIMARY_ROLE)' scope=both;

 

 

Alter system set LOG_ARCHIVE_DEST_2='LOCATION=/u01/strmdest/arch2 MANDATORY VALID_FOR=(STANDBY_LOGFILE,PRIMARY_ROLE)' scope=both;

 

1.6. 启用追加日志supplemental log

可以在Database级或table级启用supplemental log 。在table级别，确认schema下所有table都有合理的主键（Primary key）,则不再需要启用追加日志

 

源端

 

database级

SQL> alter database add supplemental log data ;

 

1.7. 增加standby redo log

源端:

SQL> select bytes from V$log;

52428800

察看redo log大小，设置的standby redo log 大小不能小于redo log 大小。

 

SQL> SELECT COUNT(GROUP#) FROM V$LOG;

            3

确定downstream database的log file groups的id，至少为source database的n+1。downstream日志组的数量可以是一个或多个。

目标端：

SQL>ALTER DATABASE ADD STANDBY LOGFILE GROUP 4

   ('/data01/apps/oracle/oradata/strmdest/slog4.rdo',

 '/data01/apps/oracle/oradata/strmdest/slog4b.rdo') SIZE 500M;

 

SQL> SELECT GROUP#, THREAD#, SEQUENCE#, ARCHIVED, STATUS

   FROM V$STANDBY_LOG;

    GROUP#    THREAD#  SEQUENCE# ARC STATUS

---------- ---------- ---------- --- ----------

         4          0          0 YES UNASSIGNED

1.8. 测试：

源端

alter system archive log current;

然后在目标端dest_2找相应的log文件，表明以上配置成功。

 

2.     Stream配置

1.1. 配置directory

源端

conn strmadmin/strmadmin

create directory dir_source as '/u01/admin';

目标端：

conn strmadmin/strmadmin

create directory dir_dest as '/u01/admin';

 

1.2. 执行maintain_global

conn strmadmin/strmadmin@strmdest

begin

DBMS_STREAMS_ADM.MAINTAIN_GLOBAL(

source_directory_object => 'dir_source ',

destination_directory_object => 'dir_dest ',

source_database => 'strmtan',

destination_database => 'strmdest',

perform_actions => true,

dump_file_name => 'streams_rep.dmp',

bi_directional => false,

include_ddl => true,

instantiation => DBMS_STREAMS_ADM.INSTANTIATION_FULL);

end;

/

 

等了将30分钟后出结果

PL/SQL procedure successfully completed.

3.测试

SQL> create table test1(id  number(10));

SQL> insert into test1 values(111);

SQL> commit;

Conn /as sysdba

SQL> alter system archive log current;

 

在源库的scott用户上执行了以上操作后，等待5分钟左右后，在目标库上找到了结果，说明目标库应用源库的DDL操作和DML操作。