备份TB级别数据的一些技巧 1、 考虑使用增量备份， 不要老是想着用全量备份 2、 对于增量备份而言 开启block change tracking 能极大地减少物理读，提升速度 3、 11g以后对于bigfile tablespace可以启用section size 来提升速度 4、 考虑到负载更低的 Data Guard物理备库上去做备份 5、 启用备份并行 CONFIGURE DEVICE TYPE DISK PARALLELISM 16; 6、 对于多节点RAC 使用 service控制负载均衡 
srvctl add service –d  -s  -r  -a ,
srvctl add service –d  -s  -r  -a ,
For example
srvctl add service –d maclean –s bkup1 –r maclean1 –a maclean2,maclean3,maclean4,maclean5,maclean6,maclean7,maclean8
srvctl add service –d maclean –s bkup2 –r maclean2 –a maclean1,maclean3,maclean4,maclean5,maclean6,maclean7,maclean8
srvctl add service –d maclean –s bkup3 –r maclean3 –a maclean1,maclean2,maclean4,maclean5,maclean6,maclean7,maclean8
srvctl add service –d maclean –s bkup4 –r maclean4 –a maclean1,maclean2,maclean3,maclean5,maclean6,maclean7,maclean8
srvctl add service –d maclean –s bkup5 –r maclean5 –a maclean1,maclean2,maclean3,maclean4,maclean6,maclean7,maclean8
srvctl add service –d maclean –s bkup6 –r maclean6 –a maclean1,maclean2,maclean3,maclean4,maclean5,maclean7,maclean8
srvctl add service –d maclean –s bkup7 –r maclean7 –a maclean1,maclean2,maclean3,maclean4,maclean5,maclean6,maclean8
srvctl add service –d maclean –s bkup8 –r maclean8 –a maclean1,maclean2,maclean3,maclean4,maclean5,maclean6,maclean7

srvctl start service –d  -s <service_name #1>
Alternatively, to start all the services for a particular database
srvctl start service –d 

run {
allocate channel ch01 connect string ‘sys/@<scan_address>/<service_name>;
allocate channel ch02 connect string ‘sys/@<scan_address>/<service_name>;

allocate channel ch16 connect string ‘sys/@<scan_address>/<service_name>;
backup database …;
}

For example

run
{
allocate channel ch01 device type disk connect 'sys/welcome1@maclean-scan/bkup1';
allocate channel ch02 device type disk connect 'sys/welcome1@maclean-scan/bkup2';
allocate channel ch03 device type disk connect 'sys/welcome1@maclean-scan/bkup3';
allocate channel ch04 device type disk connect 'sys/welcome1@maclean-scan/bkup4';
allocate channel ch05 device type disk connect 'sys/welcome1@maclean-scan/bkup5';
allocate channel ch06 device type disk connect 'sys/welcome1@maclean-scan/bkup6';
allocate channel ch07 device type disk connect 'sys/welcome1@maclean-scan/bkup7';
allocate channel ch08 device type disk connect 'sys/welcome1@maclean-scan/bkup8';
allocate channel ch09 device type disk connect 'sys/welcome1@maclean-scan/bkup1';
allocate channel ch10 device type disk connect 'sys/welcome1@maclean-scan/bkup2';
allocate channel ch09 device type disk connect 'sys/welcome1@maclean-scan/bkup1';
allocate channel ch10 device type disk connect 'sys/welcome1@maclean-scan/bkup2';
allocate channel ch11 device type disk connect 'sys/welcome1@maclean-scan/bkup3';
allocate channel ch12 device type disk connect 'sys/welcome1@maclean-scan/bkup4';
allocate channel ch13 device type disk connect 'sys/welcome1@maclean-scan/bkup5';
allocate channel ch14 device type disk connect 'sys/welcome1@maclean-scan/bkup6';
allocate channel ch15 device type disk connect 'sys/welcome1@maclean-scan/bkup7';
allocate channel ch16 device type disk connect 'sys/welcome1@maclean-scan/bkup8';
backup
as backupset
incremental level 0
section size 128g
database;
}