DBA Hub

📋Steps in this guide1/3

Rolling Forward Standby Database When Archives Missing In Primary In 12c

Till 11g , we can make standby database sync with primary by taking an incremental backup from primary and apply the same in standby  .

oracle configurationintermediate
by OracleDba
11 views
1

Overview

Till 11g , we can make standby database sync with primary by taking an incremental backup from primary and apply the same in standby  . But with 12c , a new feature has been introduced ( RECOVER DATBASE USING SERVICE) , which simplifies this method.

Code/Command (click line numbers to comment):

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
@ PRIMARY
SQL> select db_unique_name,OPEN_MODE,DATABASE_ROLE from v$database;

DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE
------------------------------ -------------------- ----------------
PRIM READ WRITE PRIMARY

@STANDBY

SQL> select db_unique_name,OPEN_MODE,DATABASE_ROLE from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE
------------------------------ -------------------- ----------------
STANDBY READ ONLY WITH APPLY PHYSICAL STANDBY

@PRIMARY
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /archive/PRIM/arch
Oldest online log sequence 88
Next log sequence to archive 90
Current log sequence 90

@STANDBY

SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /archive/PRIM/arch
Oldest online log sequence 72
Next log sequence to archive 0
Current log sequence 74

SQL> select db_unique_name,OPEN_MODE,DATABASE_ROLE from v$database;

DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE
------------------------------ -------------------- ----------------
STANDBY READ ONLY PHYSICAL STANDBY

SQL> recover managed standby database cancel;
Media recovery complete.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 1.3935E+10 bytes
Fixed Size 6002112 bytes
Variable Size 4630514240 bytes
Database Buffers 9193914368 bytes
Redo Buffers 104153088 bytes
Database mounted.
2

Section 2

Code/Command (click line numbers to comment):

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
$ rman target /

Recovery Manager: Release 12.1.0.1.0 - Production on Tue Oct 18 18:32:15 2016

Copyright (c) 1982, 2013, Oracle and/or its affiliates. All rights reserved.

connected to target database: STANDBY (DBID=599956155, not open)

RMAN> recover database from service PRIM noredo using compressed backupset;

Starting recover at 18-OCT-16
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=689 device type=DISK
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: using compressed network backup set from service PRIM
destination for restore of datafile 00001: /archive/PRIM/PRIM/system01.dbf
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: using compressed network backup set from service PRIM
destination for restore of datafile 00002: /archive/PRIM/PRIM/sysaux01.dbf
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: using compressed network backup set from service PRIM
destination for restore of datafile 00003: /archive/PRIM/PRIM/undotbs01.dbf
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: using compressed network backup set from service PRIM
destination for restore of datafile 00004: /archive/PRIM/PRIM/users01.dbf
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01

Finished recover at 18-OCT-16

RMAN> shutdown immediate;

database dismounted
Oracle instance shut down

RMAN> startup nomount;

connected to target database (not started)
Oracle instance started

Total System Global Area 13934583808 bytes

Fixed Size 6002112 bytes
Variable Size 4630514240 bytes
Database Buffers 9193914368 bytes
Redo Buffers 104153088 bytes

RMAN> restore standby controlfile from service PRIM;

Starting restore at 18-OCT-16
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=593 device type=DISK

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: using network backup set from service PRIM
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/archive/PRIM/PRIM/control01.ctl
output file name=/archive/PRIM/PRIM/control02.ctl
Finished restore at 18-OCT-16

RMAN> report schema;

Starting implicit crosscheck backup at 18-OCT-16
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=593 device type=DISK
Finished implicit crosscheck backup at 18-OCT-16

Starting implicit crosscheck copy at 18-OCT-16
using channel ORA_DISK_1
Crosschecked 2 objects
Finished implicit crosscheck copy at 18-OCT-16

searching for all files in the recovery area
cataloging files...
no files cataloged

RMAN-06139: WARNING: control file is not current for REPORT SCHEMA
Report of database schema for database with db_unique_name PRIM

List of Permanent Datafiles
===========================
File Size(MB) Tablespace RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1 700 SYSTEM *** /archive/PRIM/PRIM/system01.dbf
2 550 SYSAUX *** /archive/PRIM/PRIM/sysaux01.dbf
3 335 UNDOTBS1 *** /archive/PRIM/PRIM/undotbs01.dbf
4 5 USERS *** /archive/PRIM/PRIM/users01.dbf

List of Temporary Files
=======================
File Size(MB) Tablespace Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1 20 TEMP 32767 /archive/PRIM/PRIM/temp01.dbf
RMAN> catalog start with 'c';

searching for all files that match the pattern c
no files found to be unknown to the database

RMAN> RECOVER DATABASE;

Starting recover at 18-OCT-16
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=673 device type=DISK

starting media recovery

media recovery complete, elapsed time: 00:00:00
Finished recover at 18-OCT-16

SQL> recover managed standby database cancel;
Media recovery complete.
SQL> alter database open;

Database altered.

SQL> recover managed standby database using current logfile disconnect from session;
Media recovery complete.
Now  standby database is in sync with primary . Do few log switch in primary and check whether archives are shipping to standby or not.
But if we check the alert log of stand by , we can see warning  like No standby redo . 
Archived Log entry 4 added for thread 1 sequence 93 rlc 925475123 ID 0x23c3441f dest 2:
RFS[4]: No standby redo logfiles available for thread 1
RFS[4]: Opened log for thread 1 sequence 94 dbid 599956155 branch 925475123
Tue Oct 18 19:10:59 2016
To fix it, we need to drop and recreate the standby redo logs

SQL> recover managed standby database cancel;
Media recovery complete.
SQL> alter database drop logfile group 4;

Database altered.

SQL> alter database drop logfile group 5;

Database altered.

SQL> alter database drop logfile group 6;

Database altered.

SQL> select thread#, group#, sequence#, status from v$standby_log;
no rows selected

SQL> SQL> alter database add standby logfile '/archive/PRIM/PRIM/stdby_redo04.log' size 52428800;
Database altered.

SQL> SQL> alter database add standby logfile '/archive/PRIM/PRIM/stdby_redo05.log' size 52428800;
Database altered.

SQL> SQL> alter database add standby logfile '/archive/PRIM/PRIM/stdby_redo06.log' size 52428800;
Database altered.

SQL> SQL> alter database add standby logfile '/archive/PRIM/PRIM/stdby_redo07.log' size 52428800;
Database altered.
3

Section 3

Code/Command (click line numbers to comment):

1
2
SQL> recover managed standby database using current logfile disconnect from session;
Media recovery complete.

Comments (0)

Please to add comments

No comments yet. Be the first to comment!