RMAN遠程復制搭建物理DG過程小結

本文僅記錄搭建的過程，具體詳細的參數意義和配置原理請參考之前的總結 http://www.linuxidc.com/Linux/2015-07/119932.htm 搭建

本文僅記錄搭建的過程，具體詳細的參數意義和配置原理請參考之前的總結

搭建環境前配置主備庫的tns，確保兩數據庫能正常彼此通信

primary

確定數據庫開啟強制歸檔

startup mount;

alter database archivelog;

alter database force logging;

alter database open;

修改配置，并導出pfile，將pfile復制到目標備庫

alter system set db_unique_name=pri scope=spfile;

alter system set log_archive_config = 'DG_CONFIG=(pri,sty)' scope=spfile;

alter system set log_archive_dest_1 = 'LOCATION=/opt/app/Oracle/product/11.2.0/dbhome_1/dbs/arch VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=pri' scope=spfile;

alter system set log_archive_dest_2 = 'SERVICE=sty LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=sty' scope=spfile;

alter system set log_archive_dest_state_1 = ENABLE;

alter system set log_archive_dest_state_2 = ENABLE;

alter system set fal_server=sty scope=spfile;

alter system set fal_client=pri scope=spfile;

alter system set standby_file_management=AUTO scope=spfile;

create pfile='/home/oracle/pripfile.ora' from spfile;

standby

安裝數據庫軟件，無需安裝數據庫

復制元庫的sys密碼文件，確保兩庫的密碼一致

scp 192.168.20.46:$ORACLE_HOME/dbs/orapwxtttestdb $ORACLE_HOME/dbs/

復制目標庫導出的pfile，并添加 *.log_file_name_convert參數選項（10g之后必須添加，即使路徑沒有改變）

scp 192.168.20.46:/home/oracle/pripfile.ora /home/oracle/

*.log_file_name_convert='/opt/app/oracle/oradata/xtttestdb/','/opt/app/oracle/oradata/xtttestdb/'

創建要恢復備庫的必要目錄

mkdir -p /opt/app/oracle/admin/xtttestdb/adump
mkdir -p /opt/app/oracle/oradata/xtttestdb
mkdir -p /opt/app/oracle/product/11.2.0/dbhome_1/dbs/arch

設置SID登入數據庫

export $ORACLE_SID=xtttestdb

sqlplus / as sysdba

利用copy并修改后的pfile創建spfile，并啟動到nomount
SQL> create spfile from pfile='/home/oracle/pripfile.ora';
File created.

SQL> startup nomount;
ORACLE instance started.
Total System Global Area 1570009088 bytes
Fixed Size 2213696 bytes
Variable Size 1174407360 bytes
Database Buffers 385875968 bytes
Redo Buffers 7512064 bytes

修改備庫的參數配置

alter system set db_unique_name=sty scope=spfile;

alter system set log_archive_config='DG_CONFIG=(pri,dg)' scope=spfile;

alter system set log_archive_dest_1 ='LOCATION=/opt/app/oracle/product/11.2.0/dbhome_1/dbs/arch VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=sty' scope=spfile;

alter system set log_archive_dest_2 ='SERVICE=pri LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=pri' scope=spfile;

alter system set fal_server=pri scope=spfile;

alter system set fal_client=sty scope=spfile;

重啟數據庫到nomount，是配置生效（這些配置也可以在pfile中修改完成后再啟動數據庫庫）

SQL> shutdown immediate;

SQL> startup mount;

primary利用rman復制數據庫

rman target sys/oraclepwd@XTTTESTDB.46 auxiliary sys/oraclepwd@XTTTESTDB.54
RMAN> duplicate target database for standby from active database nofilenamecheck;

復制完成后在主備庫天劍standby redo（至少要三組）

alter database add standby logfile

group 4 ('/opt/app/oracle/oradata/xtttestdb/styredo04.log') size 50m,

group 5 ('/opt/app/oracle/oradata/xtttestdb/styredo05.log') size 50m,

group 6 ('/opt/app/oracle/oradata/xtttestdb/styredo06.log') size 50m,

group 7 ('/opt/app/oracle/oradata/xtttestdb/styredo07.log') size 50m;

啟動standby的redo應用的兩種方式

①、默認的物理DG啟動應用后，在主庫arch日志被完整寫入后才會開始應用該arch log

SQL> alter database recover managed standby database disconnect from session;

②、可以添加current logfile參數，使得應用當前正在讀寫，還沒有完成歸檔的日志

SQL> alter database recover managed standby database using current logfile disconnect from session;

關閉REDO應用

SQL> alter database recover managed standby database cancel;

查看standby log狀態

select group#,thread#,sequence#,archived,status from v$standby_log;

查看應用日志情況
select name,creator,sequence#,applied,completion_time from v$archived_log;

驗證：

primary端創建測試表，并添加數據

SQL> select count(*) from test;

COUNT(*)

----------

7

SQL> insert into test select * from test;

7 rows created.

SQL> commit;

Commit complete.

SQL> select count(*) from test;

COUNT(*)

----------

14

standby端驗證數據是否同步

SQL> select count(*) from test;

COUNT(*)

----------

14

搭建過程問題小結：

1、在備庫啟動到nomount后用tns測試連接時發現數無法連接
ORA-12528: TNS:listener: all appropriate instances are blocking new connections

原因是11g之后動態監聽不支持在nomount狀態下遠程的tns訪問，自己的服務器中配置的監聽一直是動態的

添加listener.ora 文件，為standby設置靜態監聽

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = PLSExtProc)

(ORACLE_HOME = /opt/app/oracle/product/11.2.0/dbhome_1)

(PROGRAM = extproc)

)

(SID_DESC =

(GLOBAL_DBNAME = xtttestdb)

(ORACLE_HOME = /opt/app/oracle/product/11.2.0/dbhome_1)

(SID_NAME = xtttestdb)

)

)

之后再測試連接正常

2、RMAN遠程復制數據庫完成后有redo的報錯

ORACLE error from auxiliary database: ORA-19527: physical standby redo log must be renamed

ORA-00312: online log 1 thread 1: '/opt/app/oracle/oradata/xtttestdb/redo01.log'

根據錯誤提示，加上網上搜索一下，原來10g之后的DG即使日志的原備庫路徑一樣，為了區分開來，，還是要設置log_file_name_convert參數，創建備庫的pfile文件，并添加該參數進去，利用pfile啟動數據庫，問題解決

create pfile='/home/oracle/stypfile.ora' from spfile;

添加

*.log_file_name_convert='/opt/app/oracle/oradata/xtttestdb/','/opt/app/oracle/oradata/xtttestdb/'

creaet spfile from pfile='/home/oracle/stypfile.ora'

startup

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