服务器之家

服务器之家 > 正文

详解Oracle dg 三种模式切换

时间:2019-12-24 13:59     来源/作者:mrr

oracle dg 三大模式切换

===================================
1  最大性能模式MAXIMUM PERFORMANCE   ------默认模式
===================================

一 最大性能模式特点

?
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
192.168.1.181
SQL> select database_role,protection_mode,protection_level from v$database;
DATABASE_ROLE  PROTECTION_MODE   PROTECTION_LEVEL
---------------- -------------------- --------------------
PRIMARY     MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_config          string   dg_config=(orcl,db01)
log_archive_dest_1          string   location=/home/oracle/arch_orc
                         l valid_for=(all_logfiles,all_
                         roles) db_unique_name=orcl
log_archive_dest_2          string   service=db_db01 LGWR ASYNC val
                         id_for=(online_logfiles,primar
                         y_roles) db_unique_name=db01
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   31
Next log sequence to archive  33
Current log sequence      33
192.168.1.183
SQL> select database_role,protection_mode,protection_level from v$database;
DATABASE_ROLE  PROTECTION_MODE   PROTECTION_LEVEL
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_config          string   dg_config=(db01,orcl)
log_archive_dest_1          string   location=/home/oracle/arch_db0
                         1 valid_for=(all_logfiles,all_
                         roles) db_unique_name=db01
log_archive_dest_2          string   service=db_orcl LGWR ASYNC val
                         id_for=(online_logfiles,primar
                         y_roles) db_unique_name=orcl
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   31
Next log sequence to archive  33
Current log sequence      33
192.168.1.181
SQL> alter system switch logfile;
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   32
Next log sequence to archive  34
Current log sequence      34
192.168.1.183
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_db01
Oldest online log sequence   32
Next log sequence to archive  0
Current log sequence      34

===================================
2 最大性能模式--切换到-->最大高可用  (默认是最大性能模式---MAXIMUM PERFORMANCE)
===================================

?
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
192.168.1.181
SQL> select DATABASE_ROLE,PROTECTION_MODE,PROTECTION_LEVEL from v$database;
DATABASE_ROLE  PROTECTION_MODE   PROTECTION_LEVEL
---------------- -------------------- --------------------
PRIMARY     MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
SQL> show parameter log_archive_dest_2
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2          string   service=db_db01 LGWR ASYNC val
                         id_for=(online_logfiles,primar
                         y_roles) db_unique_name=db01
192.168.1.181
SQL> shutdown immediate
192.168.1.183
SQL> alter database recover managed standby database cancel;
SQL> shutdown immediate
192.168.1.181
SQL> startup mount;
SQL> alter database set standby database to maximize availability;
SQL> alter system set log_archive_dest_2='service=db_db01 LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=db01' scope=spfile;
192.168.1.183
SQL> startup nomount
SQL> alter database mount standby database;
SQL> alter system set log_archive_dest_2='service=db_orcl LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=orcl' scope=spfile;
SQL> shutdown immediate
SQL> startup nomount
SQL> alter database mount standby database;
192.168.1.181
SQL> startup
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive_dest_2
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2          string   service=db_db01 LGWR SYNC vali
                         d_for=(online_logfiles,primary
                         _roles) db_unique_name=db01
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE  PROTECTION_LEVEL   PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY     MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   34
Next log sequence to archive  36
Current log sequence      36
192.168.1.183
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive_dest_2
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2          string   service=db_orcl LGWR SYNC vali
                         d_for=(online_logfiles,primary
                         _roles) db_unique_name=orcl
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE  PROTECTION_LEVEL   PROTECTION_MODE
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_db01
Oldest online log sequence   35
Next log sequence to archive  0
Current log sequence      36
192.168.1.181
SQL> alter system switch logfile;
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   35
Next log sequence to archive  37
Current log sequence      37
192.168.1.183
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_db01
Oldest online log sequence   36
Next log sequence to archive  0
Current log sequence      37

===================================
3 最大高可用--切换到-->最保护能模式
===================================

DG最大保护模式Maximum protection

?
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
192.168.1.181
SQL> shutdown immediate
192.168.1.183
SQL> shutdown immediate
192.168.1.181
SQL> alter database set standby database to maximize protection;
SQL> shutdown immediate
192.168.1.183
SQL> startup nomount
SQL> alter database mount standby database;
192.168.1.181
SQL> startup
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive_dest_2
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2          string   service=db_db01 LGWR SYNC vali
                         d_for=(online_logfiles,primary
                         _roles) db_unique_name=db01
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE  PROTECTION_LEVEL   PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY     MAXIMUM PROTECTION  MAXIMUM PROTECTION
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   37
Next log sequence to archive  39
Current log sequence      39
192.168.1.183
SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME         STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1    VALID
LOG_ARCHIVE_DEST_2    VALID
SQL> show parameter log_archive_dest_2
NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2          string   service=db_db01 LGWR SYNC vali
                         d_for=(online_logfiles,primary
                         _roles) db_unique_name=db01
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE  PROTECTION_LEVEL   PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY     MAXIMUM PROTECTION  MAXIMUM PROTECTION
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_db01
Oldest online log sequence   37
Next log sequence to archive  0
Current log sequence      39
192.168.1.181
SQL> alter system switch logfile;
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_orcl
Oldest online log sequence   38
Next log sequence to archive  40
Current log sequence      40
192.168.1.183
SQL> archive log list
Database log mode       Archive Mode
Automatic archival       Enabled
Archive destination      /home/oracle/arch_db01
Oldest online log sequence   37
Next log sequence to archive  0
Current log sequence      40

附:Oracle DG管理模式和只读模式相互切换

将standby数据库开启至只读模式(用于primary非常忙时,可以在standby跑一些报表)

?
1
2
3
4
$sqlplus “/as sysdba”
SQL>startup mount
SQL>alter database open read only;
[@more@]

将只读模式standby数据库切换至管理模式

?
1
2
$sqlplus “/as sysdba”
SQL>alter database recover managed standby database disconnect from session;

 将管理模式的standby数据库切换至只读模式

?
1
2
3
$sqlplus “/as sysdba”
SQL>alter database recover managed standby database cancel;
SQL>alter database open read only;

以上内容给大家介绍了Oracle dg 三种模式切换的相关知识,希望大家喜欢。

标签:

相关文章

热门资讯

玄元剑仙肉身有什么用 玄元剑仙肉身境界等级划分
玄元剑仙肉身有什么用 玄元剑仙肉身境界等级划分 2019-06-21
男生常说24816是什么意思?女生说13579是什么意思?
男生常说24816是什么意思?女生说13579是什么意思? 2019-09-17
配置IIS网站web服务器的安全策略配置解决方案
配置IIS网站web服务器的安全策略配置解决方案 2019-05-23
华为nova5pro和p30pro哪个好 华为nova5pro和华为p30pro对比详情
华为nova5pro和p30pro哪个好 华为nova5pro和华为p30pro对比详情 2019-06-22
Nginx服务器究竟是怎么执行PHP项目
Nginx服务器究竟是怎么执行PHP项目 2019-05-24
返回顶部