RMAN中MAXSETSIZE和MAXPIECESIZE的用法

MAXSETSIZE跟MAXPIECESIZE用法

区别：maxpiecesize设置的是备份完成后的备份片大小，对备份整体的大小没有影响，比如一个G的备份完成文件，maxpiecesize设置为100M，最后就会变成10个100M的备份文件。Maxsetsize设置限定的是整体大小，个人认为这个功能比较鸡肋，一般只要没人动，就用不到的。

Maxsetsize的写法：

1.

RMAN> configure maxsetsize to 2G;

RMAN> run{

2> allocate channel c1 device type disk;

3> backup database format='/u01/app/oracle/oradata/Backup/oradb_%d_%s.bak';

4> release channel c1;

5> }

2.

run{

allocate channel c1 device type disk ;

backup database maxsetsize 1000M format='/u01/app/oracle/oradata/Backup/oradb_%d_%s_%p.bak';

release channel c1;

}

清除maxsetsize的语句：RMAN> CONFIGURE MAXSETSIZE clear;

Maxpiecesize的写法：

run{

allocate channel c1 device type disk MAXPIECESIZE 100M;

backup database format='/u01/app/oracle/oradata/Backup/oradb_%d_%s_%p.bak';

release channel c1;

}

然后每个文件都是100M

[oracle@orcl Backup]$ ls -lh

total 1.2G

-rw-r----- 1 oracle oinstall 100M Dec 24 03:01 oradb_ORCL_117_10.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:01 oradb_ORCL_117_11.bak

-rw-r----- 1 oracle oinstall  71M Dec 24 03:01 oradb_ORCL_117_12.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 02:59 oradb_ORCL_117_1.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 02:59 oradb_ORCL_117_2.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 02:59 oradb_ORCL_117_3.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_4.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_5.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_6.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_7.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_8.bak

-rw-r----- 1 oracle oinstall 100M Dec 24 03:00 oradb_ORCL_117_9.bak

-rw-r----- 1 oracle oinstall 9.7M Dec 24 03:01 oradb_ORCL_118_1.bak