RMAN L0 And L1 Backup taking long time with "ADR file lock" wait event

刘泽宇

在数据库alert日志中发现频繁出现了这样的报错：
ORA-48132:请求的文件锁正忙, [HM_RUN][...\diag\rdbms\...\lck\AM_1618_3044626670.lck]
且RMAN备份确实存在失败的情况，查询文档，发现这一问题的解决方法 DOC ID 2565120.1


APPLIES TO:Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

GOAL

Rman Level 0 takes long time and does not complete.

Even L1 Backups end up in the same state

At the  time when the rman backup seems to hang following error is reported in the database alert log.

Incremental checkpoint up to RBA [0x9c6e.11752.0], current log tail at RBA [0x9c6e.124dc.0]
Sun Jun 09 02:42:39 2019
Errors in file <path>/<SID>/trace/<SID>_ora_10225.trc:
ORA-48132: requested file lock is busy, [HM_RUN] [<path>/lck/AM_1618_3044626670.lck]
ORA-48170: unable to lock file - already in use
SVR4 Error: 11: Resource temporarily unavailable
Additional information: 8
Additional information: 10759
Sun Jun 09 02:56:30 2019
Incremental checkpoint up to RBA [0x9c6e.148ff.0], current log tail at RBA [0x9c6e.15967.0]

INST_ID SID CH SEQ# EVENT STATE SECONDS
---------- ---------- -------------------- ---------- ---------------------------------------- ------------------- ----------
2 4052 rman channel=ch06 20780 ADR file lock WAITING .43                                                                       >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

...

2 1649 rman channel=ch12 14041 ADR file lock WAITING 2.30

SOLUTION

RMAN backup was taking time due to ADR file lock wait event.

Similar issue was reported in Below bug but closed as not a Bug

Bug 10125939 - GSFBDRA: RMAN VALIDATE HANG WAITING FOR 'ADR FILE LOCK' Closed as could not reproduce

Currently we have the following workaround for the issue

RMAN does not write findings to ADR if we set this event.

Setting below event disables updates to the online dictionary .

On every instance of RAC database we need to set event then only it will work :

Krb tracing needs to enabled on all nodes.

alter system set event='logon trace name krb_options level 20' scope=spfile; <==== To set it.
alter system set event='logon trace name krb_options off' scope=spfile; <==== To set it off