channel如何解析和配置
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RMAN channel是指RMAN和数据库server session的连接。RMAN本身不会做备份还原操作，当我们连接RMAN的时候，RMAN会在目标数据库上分配server sessions。channel把数据读取到PGA，经过处理后写到设备中。大多数RMAN命令都是channels在执行。
在配置channel的时候，如果在次配置channel，那么以前的channel配置会被覆盖
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
在默认情况下，RMAN只会为一个磁盘分配一个channel处理所有操作。
也可以使用allocate channel指定channel
比如运行脚本
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;
}
指定了两channel处理两个任务
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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文章题目：channel如何解析和配置
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