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12c特性解读:RAC MGMTDB资料库的转移与维护

戴明明 2016-06-30
445


戴明明(Dave)

Oracle ACE-A,ACOUG核心成员,宝存科技数据库方案架构师

Dave也是CSDN 认证专家,超过7年的DBA经验,擅长Oracle数据库诊断、性能调优,热衷于Oracle 技术的研究与分享。从14年开始研究基于PCIe闪存卡的数据库高可用,高性能解决方案。 


编辑手记:感谢Dave授权我们转载其技术文章,他在博客时代书写的大量文章影响了DBA领域的很多朋友,现在我们精选他的文章,让更多读者受益。


MGMTDB 的数据文件是存放在OCR voting disk的磁盘组里的,为了节省OCR 磁盘组空间,我们也可以把MGMTDB 转移走。而有时候如果不了解12c的这一特性,可能会遇到OCR空间紧张的情况。当然,这里的移动位置,也是从一个共享位置移动到另一个共享位置。


相关阅读:

12c特性解读:RAC MGMTDB资料库新特性说明及初相识

监控工具:Oracle 12c Cluster Health Monitor 详解


以下测试说明这个转移的过程和步骤。

1  停止并禁用ora.crf 资源

这里的ora.crf就是CHM。在所有节点使用root用户执行如下命令:

[root@rac1 ~]# crsctlstop res ora.crf -init

CRS-2673: Attempting to stop 'ora.crf' on'rac1'

CRS-2677: Stop of 'ora.crf' on 'rac1'succeeded

 

[root@rac1 ~]# crsctlmodify res ora.crf -attr ENABLED=0 -init

[root@rac1 ~]#

[root@rac2 ~]# crsctl stop res ora.crf-init

CRS-2673: Attempting to stop 'ora.crf' on'rac2'

CRS-2677: Stop of 'ora.crf' on 'rac2'succeeded

 

[root@rac2 ~]# crsctl modify res ora.crf-attr ENABLED=0 -init

[root@rac2 ~]#

注意:ora.mgmtlsnr 和 ora.mgmtdb资源不能停,否则DBCA 时会报错。


2   执行DBCA 删除management database

--查看MGMTDB的运行节点:

[root@rac1 ~]# srvctl status mgmtdb

Database is enabled

Instance -MGMTDB is running on node rac2

这里显示在节点2上运行,那么在节点2上,用grid用户,执行dbca 命令,删除MGMTDB。

[grid@rac2 ~]$ dbca -silent-deleteDatabase -sourceDB -MGMTDB

Connecting to database

4% complete

9% complete

14% complete

19% complete

23% complete

28% complete

47% complete

Updating networkconfiguration files

48% complete

52% complete

Deleting instance anddatafiles

76% complete

100% complete

Look at the log file"/u01/gridbase/cfgtoollogs/dbca/_mgmtdb.log" for further details.

[grid@rac2 ~]$

注意:如果是使用DBCA 手工创建的MGMTDB,则可能出现不能删除的情况,具体处理过程可以参考MOS: 1631336.1。


3   重建MGMTDB的CDB

12.1.0.1 执行如下命令

用grid用户,在任意节点,执行如下命令,重建CDB。

$ <GI_HOME>/bin/dbca -silent-createDatabase -templateName MGMTSeed_Database.dbc -sid -MGMTDB -gdbName_mgmtdb -storageType ASM -diskGroupName <+NEW_DG> -datafileJarLocation<GI_HOME>/assistants/dbca/templates -characterset AL32UTF8-autoGeneratePasswords -oui_internal

 注意:这里新的磁盘组,建议compatible.asm和 compatible.rdbms 属性都设置为12.1。

上面的命令使用的是磁盘组,如果是使用共享的NFS/CFS, 则使用如下命令:

<GI_HOME>/bin/dbca -silent-createDatabase -templateName MGMTSeed_Database.dbc -sid -MGMTDB -gdbName_mgmtdb -storageType FS -datafileDestination <NFS_Location>-datafileJarLocation <GI_HOME>/assistants/dbca/templates-characterset AL32UTF8 -autoGeneratePasswords -oui_internal

 

这里数据库版本是12.1.0.1,并且使用的是磁盘组,所以执行第一个命令:

[grid@rac1 ]$ dbca -silent -createDatabase-templateName MGMTSeed_Database.dbc -sid -MGMTDB -gdbName _mgmtdb -storageTypeASM -diskGroupName OCR -datafileJarLocation/u01/gridsoft/12.1.0/assistants/dbca/templates -characterset AL32UTF8-autoGeneratePasswords -oui_internal

Copying database files

1% complete

3% complete

10% complete

17% complete

24% complete

31% complete

35% complete

Creating and starting Oracle instance

37% complete

42% complete

47% complete

52% complete

53% complete

56% complete

58% complete

Registering database with Oracle GridInfrastructure

64% complete

Completing Database Creation

68% complete

78% complete

89% complete

100% complete

Look at the log file"/u01/gridbase/cfgtoollogs/dbca/_mgmtdb/_mgmtdb0.log" for furtherdetails.

[grid@rac1 ]$


12.1.0.2 执行如下命令

在任意节点,用grid用户执行如下命令:

--ASM 磁盘组:

$ <GI_HOME>/bin/dbca -silent-createDatabase -sid -MGMTDB -createAsContainerDatabasetrue -templateName MGMTSeed_Database.dbc -gdbName _mgmtdb -storageType ASM-diskGroupName <+NEW_DG> -datafileJarLocation$GRID_HOME/assistants/dbca/templates-characterset AL32UTF8 -autoGeneratePasswords -skipUserTemplateCheck

 

 

--共享的NFS/CFS 

$<GI_HOME>/bin/dbca -silent-createDatabase -templateName MGMTSeed_Database.dbc -sid -MGMTDB -gdbName_mgmtdb -storageType FS -datafileDestination <NFS_Location>-datafileJarLocation <GI_HOME>/assistants/dbca/templates -charactersetAL32UTF8 -autoGeneratePasswords -oui_internal

 

--示例:

[grid@rac1 templates]$ dbca -silent-createDatabase -sid -MGMTDB -createAsContainerDatabase true -templateNameMGMTSeed_Database.dbc -gdbName _mgmtdb -storageType ASM -diskGroupName +OCR-datafileJarLocation u01/gridsoft/12.1.0.2/assistants/dbca/templates-characterset AL32UTF8 -autoGeneratePasswords -skipUserTemplateCheck

Registering database with Oracle GridInfrastructure

5% complete

Copying database files

7% complete

9% complete

16% complete

23% complete

30% complete

41% complete

Creating and starting Oracle instance

43% complete

48% complete

49% complete

50% complete

55% complete

60% complete

61% complete

64% complete

Completing Database Creation

68% complete

79% complete

89% complete

100% complete

Look at the log file"/u01/gridbase/cfgtoollogs/dbca/_mgmtdb/_mgmtdb0.log" for furtherdetails.

[grid@rac1 templates]$ 

使用DBCA 创建PDB

[grid@rac1 templates]$ srvctl status mgmtdb

Database is enabled

Instance -MGMTDB is running on node rac1

[grid@rac1 templates]$

 

在任意节点,用grid用户执行dbca创建PDB,命令如下:

$ <GI_HOME>/bin/dbca -silent-createPluggableDatabase -sourceDB -MGMTDB -pdbName <CLUSTER_NAME>-createPDBFrom RMANBACKUP -PDBBackUpfile<GI_HOME>/assistants/dbca/templates/mgmtseed_pdb.dfb -PDBMetadataFile<GI_HOME>/assistants/dbca/templates/mgmtseed_pdb.xml -createAsClone true–internalSkipGIHomeCheck

 

--查询集群的名称:

[grid@rac1 ]$ cemutlo -n

rac-scan

[grid@rac1 ]$

注意:默认情况CLUSTER_NAME 都是-,这里比如换成_ ,我们这里就要换成rac_scan

[grid@rac1 templates]$ dbca -silent-createPluggableDatabase -sourceDB -MGMTDB -pdbName rac_scan -createPDBFromRMANBACKUP -PDBBackUpfile u01/gridsoft/12.1.0.2/assistants/dbca/templates/mgmtseed_pdb.dfb-PDBMetadataFile/u01/gridsoft/12.1.0.2/assistants/dbca/templates/mgmtseed_pdb.xml-createAsClone true -internalSkipGIHomeCheck

Creating Pluggable Database

4% complete

12% complete

21% complete

38% complete

55% complete

85% complete

Completing Pluggable Database Creation

100% complete

Look at the log file"/u01/gridbase/cfgtoollogs/dbca/_mgmtdb/rac_scan/_mgmtdb0.log" forfurther details.


验证MGMTDB

用grid用户执行如下命令,验证MGMTDB运行情况:

[grid@rac1 ~]$ srvctl status MGMTDB

Database is enabled

Instance -MGMTDB is running on node rac1

 

这里显示的是节点1,那么在节点1上在执行:

[grid@rac1 ~]$ mgmtca

[grid@rac1 ~]$ crsctl stat res -t

……

ora.MGMTLSNR

     1        ONLINE  ONLINE      rac1                    169.254.193.105 192.

                                                            168.57.5,STABLE

ora.mgmtdb

     1        ONLINE  ONLINE      rac1                     Open,STABLE

……

[grid@rac1 ~]$

 

[grid@rac1templates]$ srvctl config mgmtdb

Database unique name:_mgmtdb

Database name:

Oracle home: <CRShome>

Oracle user: grid

Spfile:+OCR/_MGMTDB/PARAMETERFILE/spfile.268.865977817

Password file:

Domain:

Start options: open

Stop options:immediate

Database role:PRIMARY

Management policy:AUTOMATIC

Type: Management

PDB name: rac_scan

PDB service: rac_scan

Cluster name:rac-scan

Database instance:-MGMTDB

[grid@rac1templates]$

 

 

[grid@rac1 templates]$ exportORACLE_SID=-MGMTDB

[grid@rac1 templates]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production onWed Dec 10 21:39:13 2014 

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to:

Oracle Database 12c Enterprise EditionRelease 12.1.0.2.0 - 64bit Production

With the Partitioning, Automatic Storage Managementand Advanced Analytics options

SQL> select file_name fromdba_data_files union select member file_name from V$logfile;

FILE_NAME

--------------------------------------------------------------------------------

+OCR/_MGMTDB/DATAFILE/sysaux.257.865977463

+OCR/_MGMTDB/DATAFILE/system.258.865977473

+OCR/_MGMTDB/DATAFILE/undotbs1.259.865977489

+OCR/_MGMTDB/ONLINELOG/group_1.261.865977635

+OCR/_MGMTDB/ONLINELOG/group_2.262.865977635

+OCR/_MGMTDB/ONLINELOG/group_3.263.865977635

 

6 rows selected.

数据文件已经转移到OCR 磁盘组了。


启用并启动ora.crf 资源

在所有节点,用root用户执行:

[root@rac1 u01]# crsctl modify res ora.crf-attr ENABLED=1 -init

 

[root@rac1 u01]# crsctl start res ora.crf-init

CRS-2672: Attempting to start 'ora.crf' on'rac1'

CRS-2676: Start of 'ora.crf' on 'rac1'succeeded

 

[root@rac1 u01]# oclumon manage -get master

 

Master = rac1

[root@rac1 u01]#

 

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最后修改时间:2020-05-08 00:00:28
文章转载自戴明明,如果涉嫌侵权,请发送邮件至:contact@modb.pro进行举报,并提供相关证据,一经查实,墨天轮将立刻删除相关内容。

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