RMAN> backup current controlfile;
Starting backup at 06-MAR-25
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=2913 instance=csqdb1 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
waiting for snapshot control file enqueue
cannot make a snapshot control file
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 03/06/2025 15:47:01
ORA-00230: operation disallowed: snapshot control file enqueue unavailable
原因：备份任务时间窗口重叠，检查当时执行是否有多个任务同时备份
处理：调整备份时间窗口
此处的原因是：之前做了一个控制文件的备份但是卡死了，退出rman控制台后台还在跑
快照控制文件入队不可用：因为另一个进程当前持有快照控制文件入队
rman配置了stb_tape磁带备份，备份时磁带库相应超时导致。
1.查询rman备份情况，11点36发起的备份没有结束时间，状态备份失败。
select a.operation,a.object_type,a.status,a.start_time,a.end_time,recid,
a.output_bytes/1024/1024/1024 from v$rman_status a order by start_time desc;
2.查询备份job详细信息，同样没有结束日期
select * from v$rman_backup_job_details;
3.查找rman进程的会话信息，会列出rman进程和通道的会话
SELECT sid, spid, client_info
FROM v$process p, v$session s
WHERE p.addr = s.paddr
AND client_info LIKE '%rman%';
4.终止rman进程及通道，操作系统上执行
kill -9 86688
5.再次查询步骤3的sql已经没有信息了
执行备份正常
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