RMAN 增量备份学习与实践

一、基础知识大家对RMAN我想都有不少的了解，此处只想对增量备份进行一下学习与实践，也是因为工作中确实有这样的需求存在。增量备份分为两种：Differential 差异，Cumulative 累积。如果不指明增量备份参数，默认的增量备份为Differential差异。常规备份方案：1周1次0级备份，其余为差异增量1级备份。或者1周1次0级备份，后两天为差异1级备份，第三天累积1级备份，后面0级备份前再次差异1级备份。总而言知，你了解了备份原理，后面策略就你自己定了。I believe you that you can choose correct policy.
（1）Differential Incremental Backups
差异增量备份，就是备份最近1次增量备份（差异或者累积）或者0级全备份后的所有变化的数据块。（2）Cumulative Incremental Backups
累积增量备份，就是备份最近0级备份后的所有变化的数据块，所以占用空间是比较多些。二、实验备份

（1）0级备份scripts：#！/bin/bashsource /home/Oracle/.bash_profile# Local variable
day=`date +%Y%m%d`
bk_dir=/rmanbackup/rman/TEST${day}# Create backup directory
mkdir -p $bk_dir# Incremental level 0 backup
rman target / log=$bk_dir/${day}.log <<EOF
RUN {
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO "$bk_dir/%F";
ALLOCATE CHANNEL ch01 TYPE DISK MAXPIECESIZE=10G;
ALLOCATE CHANNEL ch02 TYPE DISK MAXPIECESIZE=10G;
BACKUP AS COMPRESSED BACKUPSET INCREMENTAL LEVEL 0 DATABASE SKIP INACCESSIBLE FILESPERSET 10 FORMAT "$bk_dir/db_%T_%U.bak" PLUS ARCHIVELOG FILESPERSET 20 DELETE ALL INPUT FORMAT "$bk_dir/arch_%T_%U.bak";
RELEASE CHANNEL ch01;
RELEASE CHANNEL ch02;
}
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;
CROSSCHECK BACKUPSET;
DELETE NOPROMPT OBSOLETE;
EOF （2）1级差异增量备份scripst：
点击（此处）折叠或打开#！/bin/bashsource /home/oracle/.bash_profile# Local variable
day=`date +%Y%m%d`
bk_dir=/rmanbackup/rman/TEST${day}# Create backup directory
mkdir -p bk_dir# Differential Incremental level 1 backup
rman target / log=$bk_dir/${day}.log <<EOF
RUN {
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO "$bk_dir/%F";
ALLOCATE CHANNEL ch01 TYPE DISK MAXPIECESIZE=10G;
ALLOCATE CHANNEL ch02 TYPE DISK MAXPIECESIZE=10G;
BACKUP AS COMPRESSED BACKUPSET INCREMENTAL LEVEL 1 DATABASE SKIP INACCESSIBLE FILESPERSET 10 FORMAT "$bk_dir/db_%T_%U.bak" PLUS ARCHIVELOG FILESPERSET 20 FORMAT "$bk_dir/arch_%T_%U.bak" DELETE ALL INPUT;
RELEASE CHANNEL ch01;
RELEASE CHANNEL ch02;
}
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;
CROSSCHECK BACKUPSET;
DELETE NOPROMPT OBSOLETE;
EOF（3）1级累积增量备份scripst：#！/bin/bashsource /home/oracle/.bash_profile# Local variable
day=`date +%Y%m%d`
bk_dir=/rmanbackup/rman/TEST${day}# Create backup directory
mkdir -p bk_dir# Cumulative Incremental level 1 backup
rman target / log=$bk_dir/${day}.log <<EOF
RUN {
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO "$bk_dir/%F";
ALLOCATE CHANNEL ch01 TYPE DISK MAXPIECESIZE=10G;
ALLOCATE CHANNEL ch02 TYPE DISK MAXPIECESIZE=10G;
BACKUP AS COMPRESSED BACKUPSET INCREMENTAL LEVEL 1 CUMULATIVE DATABASE SKIP INACCESSIBLE FILESPERSET 10 FORMAT "$bk_dir/db_%T_%U.bak" PLUS ARCHIVELOG FILESPERSET 20 FORMAT "$bk_dir/arch_%T_%U.bak" DELETE ALL INPUT;
RELEASE CHANNEL ch01;
RELEASE CHANNEL ch02;
}
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;
CROSSCHECK BACKUPSET;
DELETE NOPROMPT OBSOLETE;
EOF三、总结
此次对增量备份进行了学习与实践，在实验过程中发现Differential Incremental 与 Cumulative Incremental的备份信息在rman中用list显示时都是1，无法分别。DBA们的看家本领，有备无患，所以每位DBA的小伙伴要学习好备份与恢复。Where there’s a will, there’s a way. Fighting Sam.更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx？tid=12本文永久更新链接地址