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os: centos 7.4
postgresql: 9.6.9
pg_rman: REL9_6_STABLE
pg_rman delete
若果提示不能删除，请执行查看输出信息。一般情况下是因为有依赖关系。除非dba再三确认，可以指定 -f 参数。
$ pg_rman show detail
======================================================================================================================
StartTime EndTime Mode Data ArcLog SrvLog Total Compressed CurTLI ParentTLI Status
======================================================================================================================
2018-12-03 15:45:06 2018-12-03 15:45:12 ARCH ---- 234MB ---- 26MB true 1 0 OK
2018-12-03 13:07:24 2018-12-03 13:07:29 INCR 3186kB 67MB ---- 8138kB true 1 0 OK
2018-12-03 13:04:57 2018-12-03 13:05:18 FULL 406MB 67MB 28kB 443MB false 1 0 OK
2018-12-03 13:01:14 2018-12-03 13:01:20 INCR 2932kB 100MB ---- 11MB true 1 0 OK
2018-12-03 12:16:05 2018-12-03 12:16:10 INCR 3203kB 67MB ---- 8083kB true 1 0 OK
2018-12-03 11:53:39 2018-12-03 11:54:00 FULL 405MB 83MB 2231kB 461MB false 1 0 OK
$ pg_rman delete '2018-12-03 11:53:39'
WARNING: cannot delete backup with start time "2018-12-03 11:53:39"
DETAIL: This is the latest full backup necessary for successful recovery.
另外 pg_rman delete 其实是删除 可以恢复到指定时间的备份之外的无用备份。描述有点绕
$ pg_rman delete '2018-12-03 13:06:39'
WARNING: cannot delete backup with start time "2018-12-03 13:04:57"
DETAIL: This is the latest full backup necessary for successful recovery.
INFO: delete the backup with start time: "2018-12-03 13:01:14"
INFO: delete the backup with start time: "2018-12-03 12:16:05"
INFO: delete the backup with start time: "2018-12-03 11:53:39"
$ pg_rman show detail
======================================================================================================================
StartTime EndTime Mode Data ArcLog SrvLog Total Compressed CurTLI ParentTLI Status
======================================================================================================================
2018-12-03 15:45:06 2018-12-03 15:45:12 ARCH ---- 234MB ---- 26MB true 1 0 OK
2018-12-03 13:07:24 2018-12-03 13:07:29 INCR 3186kB 67MB ---- 8138kB true 1 0 OK
2018-12-03 13:04:57 2018-12-03 13:05:18 FULL 406MB 67MB 28kB 443MB false 1 0 OK
对应的物理文件也已经被删除，只留下一些参数文件
$ tree 115339
115339
├── backup.ini
├── file_arclog.txt
├── file_database.txt
├── file_srvlog.txt
└── mkdirs.sh
0 directories, 5 files
-bash-4.2$ tree 121605
121605
├── backup.ini
├── file_arclog.txt
├── file_database.txt
└── mkdirs.sh
0 directories, 4 files
-bash-4.2$ tree 130114
130114
├── backup.ini
├── file_arclog.txt
├── file_database.txt
└── mkdirs.sh
0 directories, 4 files
pg_rman purge
$ pg_rman purge
INFO: DELETED backup "2018-12-03 13:01:14" is purged
INFO: DELETED backup "2018-12-03 12:16:05" is purged
INFO: DELETED backup "2018-12-03 11:53:39" is purged
$ ls -l
total 0
drwx------ 5 postgres postgres 156 Dec 3 13:05 130457
drwx------ 5 postgres postgres 133 Dec 3 13:07 130724
drwx------ 5 postgres postgres 91 Dec 3 15:45 154506
drwx------ 5 postgres postgres 156 Dec 3 16:05 160519
对应备份的所有信息都被清楚了。
参考：
https://github.com/ossc-db/pg_rman/tree/master
http://ossc-db.github.io/pg_rman/index.html
https://travis-ci.org/ossc-db/pg_rman