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RMAN channel是指RMAN和數(shù)據(jù)庫(kù)server session的連接。RMAN本身不會(huì)做備份還原操作，當(dāng)我們連接RMAN的時(shí)候，RMAN會(huì)在目標(biāo)數(shù)據(jù)庫(kù)上分配server sessions。channel把數(shù)據(jù)讀取到PGA，經(jīng)過(guò)處理后寫到設(shè)備中。大多數(shù)RMAN命令都是channels在執(zhí)行。
在配置channel的時(shí)候，如果在次配置channel，那么以前的channel配置會(huì)被覆蓋
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 2G;


new RMAN configuration parameters:
CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 2 G;
new RMAN configuration parameters are successfully stored
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/home/oracle/%U';


old RMAN configuration parameters:
CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 2 G;
new RMAN configuration parameters:
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT   '/home/oracle/%U';
new RMAN configuration parameters are successfully stored


在默認(rèn)情況下，RMAN只會(huì)為一個(gè)磁盤分配一個(gè)channel處理所有操作。
也可以使用allocate channel指定channel
比如運(yùn)行腳本
RUN 
[oracle@lzl ~]$ cat rman.script 
RUN 
{
  ALLOCATE CHANNEL c1 DEVICE TYPE DISK format '/home/oracle/c1.bakset';
  BACKUP TABLESPACE users;
  ALLOCATE CHANNEL c2 DEVICE TYPE DISK format '/home/oracle/c2.bakset';
  BACKUP spfile;
}
指定了兩channel處理兩個(gè)任務(wù)

RMAN> @/home/oracle/rman.script


RMAN> RUN 
2> {
3>   ALLOCATE CHANNEL c1 DEVICE TYPE DISK format '/home/oracle/c1.bakset';
4>   BACKUP TABLESPACE users;
5>   ALLOCATE CHANNEL c2 DEVICE TYPE DISK format '/home/oracle/c2.bakset';
6>   BACKUP spfile;
7> }
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=1 device type=DISK


Starting backup at 2017-07-23 23:49:58
channel c1: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/test/users01.dbf
output file name=/home/oracle/c1.bakset tag=TAG20170723T234958 RECID=2 STAMP=950140201
channel c1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2017-07-23 23:50:01


allocated channel: c2
channel c2: SID=42 device type=DISK


Starting backup at 2017-07-23 23:50:02
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
including current SPFILE in backup set
channel c1: starting piece 1 at 2017-07-23 23:50:02
RMAN-03009: failure of backup command on c1 channel at 07/23/2017 23:50:02
ORA-19504: failed to create file "/home/oracle/c1.bakset"
ORA-27038: created file already exists
Additional information: 1
channel c1 disabled, job failed on it will be run on another channel
channel c2: starting full datafile backup set
channel c2: specifying datafile(s) in backup set
including current SPFILE in backup set
channel c2: starting piece 1 at 2017-07-23 23:50:02
channel c2: finished piece 1 at 2017-07-23 23:50:03
piece handle=/home/oracle/c2.bakset tag=TAG20170723T235002 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:01
Finished backup at 2017-07-23 23:50:03
released channel: c1
released channel: c2


RMAN> **end-of-file**




[oracle@lzl ~]$ ls -lrth *.bakset
-rw-r----- 1 oracle oinstall 409M Jul 23 23:50 c1.bakset
-rw-r----- 1 oracle oinstall  96K Jul 23 23:50 c2.bakset

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