Exadata 中 RMAN 的使用与优化
1. RMAN 备份通道分配与备份位置选择
1.1 通道分配
RMAN 命令执行时,会分配多个通道连接到不同实例,确保备份分散到各个计算节点。示例命令输出如下:
connected to target database: PROPRD (DBID=1716317401)
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=2316 instance=PROPRD1 device type=DISK
allocated channel: c2
channel c2: SID=2832 instance=PROPRD1 device type=DISK
allocated channel: c3
channel c3: SID=2316 instance=PROPRD6 device type=DISK
allocated channel: c4
channel c4: SID=2832 instance=PROPRD6 device type=DISK
allocated channel: c5
channel c5: SID=2574 instance=PROPRD2 device type=DISK
allocated channel: c6
channel c6: SID=2832 instance=PROPRD4 device type=DISK
... output truncated ...
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