rman DRA(data recovery advisor)数据恢复顾问

DRA: data recovery advisor ,数据恢复顾问,可主动和被动分析故障

制造故障

 mv users01.dbf users01.dbf.bak

检测

SQL> alter system checkpoint;
alter system checkpoint
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 130432
Session ID: 21 Serial number: 38991

发现数据崩溃了,尝试打开数据库

SQL> startup;
ORACLE instance started.

Total System Global Area 4999610368 bytes
Fixed Size            8803024 bytes
Variable Size         1040190768 bytes
Database Buffers     3942645760 bytes
Redo Buffers            7970816 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 7 - see DBWR trace file
ORA-01110: data file 7: '/oracle/lu8db/oradata/lu8db/users01.dbf'

RMAN 尝试DRA

[oralu8@mylu8 lu8db]$ rman target /

Recovery Manager: Release 12.2.0.1.0 - Production on Fri Jun 19 20:52:08 2020

Copyright (c) 1982, 2017, Oracle and/or its affiliates.  All rights reserved.

connected to target database: LU8DB (DBID=601284688, not open)

RMAN> list failure detail;

using target database control file instead of recovery catalog
Database Role: PRIMARY

List of Database Failures
=========================

Failure ID Priority Status    Time Detected       Summary
---------- -------- --------- ------------------- -------
942        HIGH     OPEN      2020-06-19 19:10:25 One or more non-system datafiles are missing
  Impact: See impact for individual child failures
  List of child failures for parent failure ID 942
  Failure ID Priority Status    Time Detected       Summary
  ---------- -------- --------- ------------------- -------
  1150       HIGH     OPEN      2020-06-19 20:48:12 Datafile 7: '/oracle/lu8db/oradata/lu8db/users01.dbf' is missing
    Impact: Some objects in tablespace USERS might be unavailable

RMAN> advise failure 1150 ;

Database Role: PRIMARY

List of Database Failures
=========================

Failure ID Priority Status    Time Detected       Summary
---------- -------- --------- ------------------- -------
1150       HIGH     OPEN      2020-06-19 20:48:12 Datafile 7: '/oracle/lu8db/oradata/lu8db/users01.dbf' is missing
  Impact: Some objects in tablespace USERS might be unavailable

analyzing automatic repair options; this may take some time
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=12 device type=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: SID=138 device type=DISK
allocated channel: ORA_DISK_3
channel ORA_DISK_3: SID=263 device type=DISK
allocated channel: ORA_DISK_4
channel ORA_DISK_4: SID=390 device type=DISK
analyzing automatic repair options complete

Mandatory Manual Actions
========================
no manual actions available

Optional Manual Actions
=======================
1. If file /oracle/lu8db/oradata/lu8db/users01.dbf was unintentionally renamed or moved, restore it

Automated Repair Options
========================
Option Repair Description
------ ------------------
1      Restore and recover datafile 7  
  Strategy: The repair includes complete media recovery with no data loss
  Repair script: /oracle/lu8db/diag/rdbms/lu8db/lu8db/hm/reco_742794723.hm

尝试自动修复

RMAN> @/oracle/lu8db/diag/rdbms/lu8db/lu8db/hm/reco_742794723.hm

RMAN>    # restore and recover datafile
2>    restore ( datafile 7 );
Starting restore at 2020-06-19 20:53:22
using channel ORA_DISK_1
using channel ORA_DISK_2
using channel ORA_DISK_3
using channel ORA_DISK_4

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00007 to /oracle/lu8db/oradata/lu8db/users01.dbf
channel ORA_DISK_1: reading from backup piece /oracle/lu8db/12c/dbs/0pv35bqb_1_1
channel ORA_DISK_1: piece handle=/oracle/lu8db/12c/dbs/0pv35bqb_1_1 tag=TAG20200619T153746
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 2020-06-19 20:53:23

RMAN>    recover datafile 7;
Starting recover at 2020-06-19 20:53:23
using channel ORA_DISK_1
using channel ORA_DISK_2
using channel ORA_DISK_3
using channel ORA_DISK_4

starting media recovery

archived log for thread 1 with sequence 4 is already on disk as file /oracle/lu8db/12c/dbs/arch1_4_1043341011.dbf
archived log file name=/oracle/lu8db/12c/dbs/arch1_4_1043341011.dbf thread=1 sequence=4
media recovery complete, elapsed time: 00:00:00
Finished recover at 2020-06-19 20:53:23

RMAN>    sql 'alter database datafile 7 online';
sql statement: alter database datafile 7 online

RMAN> **end-of-file**

确认结果

QL> alter database open; 

Database altered.

SQL> show pdbs;

    CON_ID CON_NAME              OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
     2 PDB$SEED              READ ONLY  NO
     3 ZTZPDB              READ WRITE NO
     4 ZTZ3               READ WRITE NO
     6 ZTZ2               READ WRITE NO

故障清除了

RMAN> list failure detail;

Database Role: PRIMARY

no failures found that match specification

总结,DRA,比较智能但是,还是要人的参与.