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。
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。
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]#
