Oracle HA 之 RAC one node实战

--创建rac one node步骤

安装grid软件，配置grid集群；
安装oracle软件；
dbca创建rac one node。

>试验创建的rac one node数据库信息如下：

global db name:                 dbkdb
sid:                            dbkdb
service name:                   dbk
安装节点:                       node1、node2

--检查数据库信息

>环境信息检查：

[grid@node1 ~]$ crsctl status res -t
--------------------------------------------------------------------------------
NAME           TARGET  STATE        SERVER                   STATE_DETAILS      
--------------------------------------------------------------------------------

.........  
                  
ora.dbkdb.db
      1        ONLINE  ONLINE       node2                    Open               
ora.dbkdb.dbk.svc
      1        ONLINE  ONLINE       node2                                       
ora.dbking.db
      1        ONLINE  ONLINE       node1                    Open               
      2        ONLINE  ONLINE       node2                    Open     
         
.........  
                  
ora.orcl.db
      1        ONLINE  ONLINE       node1                    Open               
ora.orclasm.db
      1        ONLINE  ONLINE       node1                    Open    
          
.........
                  
[grid@node1 ~]$

可以看到，目前这个grid集群下包含节点node1和node2，有一套rac数据库dbking，两套单实例数据库orcl（普通存储），orclasm（asm存储），一套rac one node库dbkdb。

>确认dbkdb为rac one node数据库：

[grid@node1 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances:
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RACOneNode                                         --确实为rac one node类型
Online relocation timeout: 30
Instance name prefix: dbkdb
Candidate servers: node2,node1
Database is administrator managed

>rac one node库当前运行情况：

[grid@node1 ~]$ srvctl status database -d dbkdb
Instance dbkdb_1 is running on node node2
Online relocation: INACTIVE

>数据库信息检查如下：

C:\Users\Administrator>sqlplus sys/oracle@192.168.100.23/dbk as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on 星期四 8月 4 09:38:57 2016

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

连接到:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management,
OLAP,
Data Mining and Real Application Testing options

SQL> set line 200;
SQL> set pagesize 999;
SQL> select instance_name,status from gv$instance;

INSTANCE_NAME                     STATUS
------------------------------------------------ ------------------------------------
dbkdb_1                      OPEN

SQL> select name from v$datafile;

NAME
----------------------------------------------------------------------------------------------
+FLASH/dbkdb/datafile/system.261.918983553
+FLASH/dbkdb/datafile/sysaux.262.918983553
+FLASH/dbkdb/datafile/undotbs1.263.918983553
+FLASH/dbkdb/datafile/users.264.918983553
+FLASH/dbkdb/datafile/undotbs2.272.918983747

SQL> select member from v$logfile;

MEMBER
----------------------------------------------------------------------------------------------
+FLASH/dbkdb/onlinelog/group_2.269.918983647
+FLASH/dbkdb/onlinelog/group_2.270.918983649
+FLASH/dbkdb/onlinelog/group_1.267.918983645
+FLASH/dbkdb/onlinelog/group_1.268.918983645
+FLASH/dbkdb/onlinelog/group_3.273.918983845
+FLASH/dbkdb/onlinelog/group_3.274.918983847
+FLASH/dbkdb/onlinelog/group_4.275.918983847
+FLASH/dbkdb/onlinelog/group_4.276.918983849

8 rows selected.

SQL>

--rac one node在线飘移

>语法：srvctl relocate database -d <db_unique_name> {[-n <target node>] [-w <timeout>] | -a [-r]} [-v]

>将dbkdb从node2漂移到node1

检查当前dbkdb运行状态：

[oracle@node1 ~]$ srvctl status database -d dbkdb
Instance dbkdb_1 is running on node node2
Online relocation: INACTIVE

发起漂移命令（oracle用户执行）：

###########################如果在grid用户下执行会报“权限不足”的错误#################################################
[grid@node2 ~]$ srvctl relocate database -d dbkdb -n node1 -w 5  
PRCD-1222 : Online relocation of database "dbkdb" failed but database was restored to its original state
PRCR-1037 : Failed to update cardinality of the resource ora.dbkdb.db to 2
PRCR-1071 : Failed to register or update resource ora.dbkdb.db
CRS-0245:  User doesn't have enough privilege to perform the operation
####################################################################################################################

[oracle@node2 ~]$ srvctl relocate database -d dbkdb -n node1 -w 5

检查中间状态：

[oracle@node2 ~]$ srvctl status database -d dbkdb
Instance dbkdb_1 is running on node node2
Online relocation: ACTIVE
Source instance: dbkdb_1 on node2
Destination instance: dbkdb_2 on node1

漂移完成后检查实例运行状态：以经运行在node1上了

[oracle@node2 ~]$ srvctl status database -d dbkdb
Instance dbkdb_2 is running on node node1
Online relocation: INACTIVE

--rac one node数据库的伸缩能力

>伸：将dbkdb扩展成为rac数据库：转换、add实例、启动实例

当前dbkdb信息：

[oracle@node2 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances:
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RACOneNode
Online relocation timeout: 30
Instance name prefix: dbkdb
Candidate servers: node2,node1
Database is administrator managed

发起转换命令：srvctl convert database

[oracle@node2 ~]$ srvctl convert database -d dbkdb -c rac

再次查看dbkdb信息：

[oracle@node2 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances: dbkdb_1
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RAC
Database is administrator managed

已经成功从rac one node转换为rac数据库，但是目前实例只有一个。

[oracle@node2 ~]$ srvctl status database -d dbkdb
Instance dbkdb_1 is running on node node2

添加实例：

[oracle@node2 ~]$ srvctl add instance -d dbkdb -i dbkdb_2 -n node1

查看dbkdb的配置信息：

[oracle@node2 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances: dbkdb_2,dbkdb_1
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RAC
Database is administrator managed

[oracle@node2 ~]$ srvctl status database -d dbkdb
Instance dbkdb_2 is not running on node node1
Instance dbkdb_1 is running on node node2

实例添加成功，但是实例目前处于关闭状态：

启动新实例：

[oracle@node2 ~]$ srvctl start instance -d dbkdb -i dbkdb_2

[oracle@node2 ~]$ srvctl status database -d dbkdb
Instance dbkdb_2 is running on node node1
Instance dbkdb_1 is running on node node2

可以看到目前，rac one node数据库已经成功转换为rac数据库了。

检查dbkdb这个rac数据库信息：回滚段和日志线程组

SQL> select tablespace_name,status from dba_tablespaces;

TABLESPACE_NAME                STATUS
------------------------------ ---------
SYSTEM                         ONLINE
SYSAUX                         ONLINE
UNDOTBS1                       ONLINE
TEMP                           ONLINE
USERS                          ONLINE
UNDOTBS2                       ONLINE

已选择6行。

SQL> select group#,thread#,status,members from v$log;

GROUP#    THREAD# STATUS              MEMBERS
---------- ---------- ---------------- ----------
         1          1 CURRENT                   2
         2          1 INACTIVE                  2
         3          2 CURRENT                   2
         4          2 UNUSED                    2

SQL>

>缩：将dbkdb转换为rac one node数据库：删除实例、转换

注意：
    必须要有service；
    删除rac数据库多余实例。

查看dbkdb的配置信息：

[grid@node1 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances: dbkdb_2,dbkdb_1
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RAC
Database is administrator managed

[grid@node1 ~]$ srvctl status database -d dbkdb
Instance dbkdb_2 is running on node node1
Instance dbkdb_1 is running on node node2

可以看到，这是一个包含2个实例的rac数据库。

dbca删除实例：图形化界面删除-略。silent模式如下：

dbca -silent -deleteinstance -gdbname dbkdb -instancename dbkdb_2 -sysdbausername sys -sysdbapassword oracle

删除实例后，检查配置信息：

[grid@node1 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances: dbkdb_1
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RAC
Database is administrator managed
[grid@node1 ~]$ srvctl status database -d dbkdb
Instance dbkdb_1 is running on node node2

检查数据库信息：

SQL> select group#,thread#,status,members from v$log;

GROUP#    THREAD# STATUS              MEMBERS
---------- ---------- ---------------- ----------
         1          1 CURRENT                   2
         2          1 INACTIVE                  2

SQL> select tablespace_name,status from dba_tablespaces;

TABLESPACE_NAME                STATUS
------------------------------ ---------
SYSTEM                         ONLINE
SYSAUX                         ONLINE
UNDOTBS1                       ONLINE
TEMP                           ONLINE
USERS                          ONLINE
UNDOTBS2                       ONLINE

已选择6行。

dbkdb_2实例相应的日志线程也同时被删除了，但是其对应的undo表空间还是处于online状态的。

现在dbkdb只剩下一个isntance，可以进行rac数据库向rac one node的转换了：执行转换之前必须保证数据库有service以及仅剩下一个instance

[oracle@node2 ~]$ srvctl convert database -d dbkdb -c raconenode -i dbkdb_1 -w 5

检查dbkdb状态：

[grid@node1 ~]$ srvctl config database -d dbkdb
Database unique name: dbkdb
Database name: dbkdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +FLASH/dbkdb/spfiledbkdb.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: dbkdb
Database instances:
Disk Groups: FLASH
Mount point paths:
Services: dbk
Type: RACOneNode
Online relocation timeout: 2
Instance name prefix: dbkdb
Candidate servers: node2
Database is administrator managed