数据库|mysql教程
如何,使用,RMAN,增量,备份,恢复,dataguardl
数据库-mysql教程
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主库查询最小scn 信息： SQL col current_scn for 999999999999999SQL SELECT CURRENT_SCN FROM V$DATABASE;select min(fhscn) from x$kcvfh;select min(f.fhscn) from x$kcvfh f, v$datafile dwhere f.hxfil =d.file#and d.enabled != READ ONLY ;CURRENT_S
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主库查询最小scn 信息：
SQL> col current_scn for 999999999999999SQL> SELECT CURRENT_SCN FROM V$DATABASE;select min(fhscn) from x$kcvfh;select min(f.fhscn) from x$kcvfh f, v$datafile dwhere f.hxfil =d.file#and d.enabled != READ ONLY ;CURRENT_SCN----------------12614205226673MIN(FHSCN)----------------12614205076072MIN(F.FHSCN)----------------12614205076072+++++++++++++++++++++++++++++++++++++++++++++++=
1.—-备库取消归档应用
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
2.—-备库确定 lowest scn
col current_scn for 99999999999999SELECT CURRENT_SCN FROM V$DATABASE;select min(fhscn) from x$kcvfh;select min(f.fhscn) from x$kcvfh f, v$datafile dwhere f.hxfil =d.file#and d.enabled != READ ONLY ;
取上述查询中的最小值
SQL> col current_scn for 999999999999999999SQL> SELECT CURRENT_SCN FROM V$DATABASE;CURRENT_SCN-------------------12611050666604SQL> select min(fhscn) from x$kcvfh;MIN(FHSCN)----------------12611050666605SQL> select min(f.fhscn) from x$kcvfh f, v$datafile dwhere f.hxfil =d.file#and d.enabled != READ ONLY ; 2 3MIN(F.FHSCN)----------------12611050666605
3.—–on primary db 端根据第2步中获取的最小scn 来进行增量备份
BACKUP INCREMENTAL FROM SCN 12611050666604 DATABASE FORMAT ‘/lixora/ForStandby_%U’ tag ‘FORSTANDBY’;
4.—–拷贝备份到 备库
$scp ForStandby_07pqprm4_1_1 192.168.0.10:/tmp
5.—-on standby db 在备库端注册备份片，注意用户属主，权限
RMAN> CATALOG START WITH ‘/lixora/ForStandby’;
6.—-执行恢复
RMAN> RECOVER DATABASE NOREDO;
7.—–on primary db 生成新的standby 控制文件
RMAN> BACKUP CURRENT CONTROLFILE FOR STANDBY FORMAT ‘/lixora/ForStandbyCTRL.bck’;
8.—-把主库端生成的standby 控制文件拷贝到备库，注意用户属主，权限
RMAN> BACKUP CURRENT CONTROLFILE FOR STANDBY FORMAT ‘/lixora/ForStandbyCTRL.bck’;
scp /lixora/ForStandbyCTRL.bck 192.168.0.10:/tmp
9.——备份备库数据文件信息，用于在恢复新的standby 控制文件后比对
spool datafile_names_step8.txtset lines 200col name format a60select file#, name from v$datafile order by file# ;spool off
10.——on standby Db 恢复新的standby 控制文件
RMAN> SHUTDOWN IMMEDIATE ;RMAN> STARTUP NOMOUNT;RMAN> RESTORE STANDBY CONTROLFILE FROM /tmp/ForStandbyCTRL.bck;
11.—–更新控制文件中的数据文件信息
使新的standby 控制文件生效
RMAN> SHUTDOWN;RMAN> STARTUP MOUNT;CATALOG START WITH +DATA/zhglptdg/datafile/;
12.——on primary db。确保在备库发生日志gap 后，主库没有添加过新的数据文件。
SELECT FILE#, NAME FROM V$DATAFILE WHERE CREATION_CHANGE# > 12611050666604；
如果有记录，则不能进行witch 操作，可以参考一下文档来恢复：
Note 1531031.1 Steps to perform for Rolling forward a standby database using RMAN incremental backup when datafile is added to primary
13.—–重命名数据文件
RMAN> SWITCH DATABASE TO COPY;
14.—–再次确认在恢复增量备份片后主库和备库scn 差距没有太大
SQL> col current_scn for 99999999999999SELECT CURRENT_SCN FROM V$DATABASE;select min(fhscn) from x$kcvfh;select min(f.fhscn) from x$kcvfh f, v$datafile dwhere f.hxfil =d.file#and d.enabled != READ ONLY ;CURRENT_SCN---------------12614205662375MIN(FHSCN)----------------12614205076072MIN(F.FHSCN)----------------12614205076072
15.—— On standby database, 清理standby 日志组
select * from v$standby_log;SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;SQL> ALTER DATABASE CLEAR LOGFILE GROUP 2;SQL> ALTER DATABASE CLEAR LOGFILE GROUP 3;
16.——启动redo data apply
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT;
如果遇到一些由于设置 nologgling 而导致部分数据丢失，可以安装下述方法来进行恢复
To resolve NOLOGGING operations only, see Note 958181.1.
In addition to this information, see the online documentation:
10.2: /docs/cd/B19306_01/server.102/b14239/scenarios.htm#CIHIAADC
11.1: /docs/cd/B28359_01/server.111/b28294/rman.htm#SBYDB00759
11.2: /docs/cd/E11882_01/server.112/e17022/rman.htm#CIHIAADC
后记
如果要启用实时应用，需要在备库添加standby redo log，大小应和主库一样，且比主库多一组；
ALTER DATABASE add standby LOGFILE GROUP 6 size 500M;
ALTER DATABASE add standby LOGFILE GROUP 7 size 500M;
ALTER DATABASE add standby LOGFILE GROUP 8 size 500M;
ALTER DATABASE add standby LOGFILE GROUP 9 size 500M;
启用命令：
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE;
oracle 10g standby database 实时应用 redo 数据
如何确保dg 已经正常，后台日志类似如下：
Mon Dec 22 10:03:04 CST
RFS[1]: Archived Log: ‘+DATA/lixora/archivelog/1_23094_790186477.dbf’
Mon Dec 22 10:03:25 CST
Media Recovery Log +DATA/lixora/archivelog/1_23094_790186477.dbf
Media Recovery Waiting for thread 1 sequence 23095 (in transit)
Mon Dec 22 10:05:53 CST
RFS[2]: Archived Log: ‘+DATA/lixora/archivelog/1_23095_790186477.dbf’
Primary database is in MAXIMUM PERFORMANCE mode
RFS[2]: No standby redo logfiles of size 1024000 blocks exist
Mon Dec 22 10:05:55 CST
Media Recovery Log +DATA/zhglptdg/archivelog/1_23095_790186477.dbf
Media Recovery Waiting for thread 1 sequence 23096 (in transit)
Mon Dec 22 10:05:57 CST
RFS[2]: Archived Log: ‘+DATA/lixora/archivelog/1_23096_790186477.dbf’
Primary database is in MAXIMUM PERFORMANCE mode
RFS[2]: No standby redo logfiles of size 1024000 blocks exist
Mon Dec 22 10:06:00 CST
Media Recovery Log +DATA/lixora/archivelog/1_23096_790186477.dbf
Media Recovery Waiting for thread 1 sequence 23097 (in transit)
类似一下日志，表明日志只是传过来，但是没有应用：
Tue Dec 16 17:28:48 CST
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: Successfully opened standby log 7: ‘+DATA/lixora/onlinelog/group_7.360.857131345’
Tue Dec 16 18:57:12 CST
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: Successfully opened standby log 8: ‘+DATA/lixora/onlinelog/group_8.361.857131375’
Tue Dec 16 20:12:13 CST
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: Successfully opened standby log 7: ‘+DATA/lixora/onlinelog/group_7.360.857131345’
Tue Dec 16 21:40:39 CST
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: Successfully opened standby log 8: ‘+DATA/lixora/onlinelog/group_8.361.857131375’
如何可以确保dg 正常：
1）v$archive_log.applied 是否为yes
2）主库切换日志：ALTER system swtich logfile；
看备库v$database.CURRENT_SCN 是否有增长？
