注:本文謝絕轉載。
1 MGMTDB 說明
在Oracle 12.1.0.1的Grid Infrastructure 的安裝中,可以選擇是否安裝Grid Infrastructure Management Repository (GIMR) 數據庫:MGMTDB. 如下圖:
在Grid Infrastructure 12.1.0.2 中,已經沒有改選項,MIMR 數據庫已經變成了強制選項。
在Oracle 12c 中Management Database 用來存儲Cluster HealthMonitor(CHM/OS,ora.crf) ,Oracle Database QoS Management,Rapid Home Provisioning和其他的數據。
ManagementRepository 是受12c Clusterware 管理的一個單實例,在Cluster 啓動的時會啓動MGMTDG並在其中一個節點上運行,並受GI 管理,如果運行MGMTDG的節點宕機了,GI 會自動把MGMTDB 轉移到其他的節點上。
默認情況,MGMTDB 數據庫的數據文件存放在共享的設備,如OCR/Voting 的磁盤組中,但後期可以移動位置。
在12.1.0.1 中,GIMR 是可選的,如果在安裝GI的時候,沒有選擇Management Database 數據庫,那麼所有依賴的特性,如ClusterHealth Monitor (CHM/OS) 就會被禁用。
當然,在12.1.0.2 中,可以忽略這個問題,因爲是強制安裝GIMR了。
另外,對於MGMT 數據庫,在目前的版本中,也不需要手工對其進行備份。
2 MGMTDB 基本操作
2.1 查看Management DB 相關的資源:
[root@rac1 ~]# crsctl stat res -t
--------------------------------------------------------------------------------
Name Target State Server Statedetails
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
……
ora.MGMTLSNR
1 ONLINE ONLINE rac2 169.254.142.79 192.1
68.57.6,STABLE
ora.mgmtdb
1 ONLINE ONLINE rac2 Open,STABLE
……
[root@rac1 ~]#
使用crsctl 命令可以看到ora.mgmtdb和ora.MGMTLSNR。
在操作系統層面,也可以查看到有2個對應的進程:
[root@rac2 ~]# ps -ef| grep pmon_-MGMTDB
grid 7452 1 0 14:59 ? 00:00:00 mdb_pmon_-MGMTDB
root 7756 7727 0 15:02 pts/4 00:00:00 grep pmon_-MGMTDB
[root@rac2 ~]# ps -ef| grep MGMTLSNR
grid 7411 1 014:58 ? 00:00:00/u01/gridsoft/12.1.0/bin/tnslsnr MGMTLSNR -no_crs_notify -inherit
root 7758 7727 0 15:02 pts/4 00:00:00 grep MGMTLSNR
[root@rac2 ~]#
2.2 啓動和關閉MGMT
正常情況下,MGMTDB 會在GI 啓動的時候,會自動啓動,但也可以手工管理,直接使用srvctl 操作即可:
Usage: srvctl start mgmtdb[-startoption <start_option>] [-node <node_name>]
Usage: srvctl start mgmtlsnr [-node <node_name>]
2.3 查看Management Database 的log 和trace 文件
一般情況下,是不需要查看MGMT DB的trace的,如果要查看,用如下命令:
[grid@rac2 _mgmtdb]$ pwd
/u01/gridbase/diag/rdbms/_mgmtdb
[grid@rac2 _mgmtdb]$ ls
i_1.mif -MGMTDB
[grid@rac2 _mgmtdb]$
進入$ORACLE_BASE下的trace目錄。但是進入-MGMTDB時,要注意,不能直接cd:
[grid@rac2 _mgmtdb]$ cd -MGMTDB
-bash: cd: -M: invalid option
cd: usage: cd [-L|-P] [dir]
[grid@rac2 _mgmtdb]$
必須使用./-MGMTDB,如:
[grid@rac2 _mgmtdb]$ cd ./-MGMTDB
[grid@rac2 -MGMTDB]$ ls
alert hm incpkg lck metadata metadata_pv sweep
cdump incident ir log metadata_dgif stage trace
[grid@rac2 -MGMTDB]$
[grid@rac2 trace]$ pwd
/u01/gridbase/diag/rdbms/_mgmtdb/-MGMTDB/trace
[grid@rac2 trace]$ ls
alert_-MGMTDB.log -MGMTDB_ckpt_4772.trm -MGMTDB_lgwr_7475.trc -MGMTDB_m001_10288.trm -MGMTDB_ora_10486.trc -MGMTDB_p001_5645.trm
cdmp_20140807064254 -MGMTDB_ckpt_7477.trc -MGMTDB_lgwr_7475.trm -MGMTDB_m001_10330.trc -MGMTDB_ora_10486.trm -MGMTDB_p001_7523.trc
cdmp_20141208110548 -MGMTDB_ckpt_7477.trm -MGMTDB_m000_10101.trc -MGMTDB_m001_10330.trm -MGMTDB_ora_10830.trc -MGMTDB_p001_7523.trm
cdmp_20141208110550 -MGMTDB_dbrm_4764.trc -MGMTDB_m000_10101.trm -MGMTDB_m001_8055.trc -MGMTDB_ora_10830.trm -MGMTDB_rbal_10460.trc
cdmp_20141208110553 -MGMTDB_dbrm_4764.trm -MGMTDB_m000_10202.trc -MGMTDB_m001_8055.trm -MGMTDB_ora_3770.trc -MGMTDB_rbal_10460.trm
cdmp_20141208110555 -MGMTDB_dbrm_7469.trc -MGMTDB_m000_10202.trm -MGMTDB_mark_10484.trc -MGMTDB_ora_3770.trm -MGMTDB_rbal_4782.trc
MGMT DB 的日誌和trace 都在這個裏。
3 MGMTDB是帶一個PDB的CDB數據庫
前面說了,MGMTDB 是一個實例,實際上,MGMTDB是帶一個PDB的CDB庫,我們可以使用GI的命令直接去操作MGMTDB 對應的PDB。
--查看MGMTDB當前節點:
[grid@rac2 /]$ oclumon manage -get master
Master = rac1
--查看狀態:
[grid@rac2 /]$ srvctl status mgmtdb
Database is enabled
Instance -MGMTDB is running on node rac2
--查看配置信息:
[grid@rac2 /]$ srvctl config mgmtdb
Database unique name: _mgmtdb
Database name:
Oracle home: /u01/gridsoft/12.1.0
Oracle user: grid
Spfile:+OCR_VOTING/_mgmtdb/spfile-MGMTDB.ora
Password file:
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Database instance: -MGMTDB
Type: Management
--連接MGMTDB實例
[grid@rac2 /]$ export ORACLE_SID=-MGMTDB
[grid@rac2 /]$ sqlplus / as sysdba
SQL*Plus: Release 12.1.0.1.0 Production onMon Dec 8 15:24:37 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise EditionRelease 12.1.0.1.0 - 64bit Production
With the Partitioning, Automatic StorageManagement and Advanced Analytics options
SQL> select file_name fromdba_data_files union select member file_name from V$logfile;
FILE_NAME
--------------------------------------------------------------------------------
+OCR_VOTING/_MGMTDB/DATAFILE/sysaux.258.854939615
+OCR_VOTING/_MGMTDB/DATAFILE/sysgridhomedata.261.854939891
+OCR_VOTING/_MGMTDB/DATAFILE/sysmgmtdata.260.854939737
+OCR_VOTING/_MGMTDB/DATAFILE/system.259.854939661
+OCR_VOTING/_MGMTDB/DATAFILE/undotbs1.257.854939605
+OCR_VOTING/_MGMTDB/ONLINELOG/group_1.263.854940051
+OCR_VOTING/_MGMTDB/ONLINELOG/group_2.264.854940053
+OCR_VOTING/_MGMTDB/ONLINELOG/group_3.265.854940057
8 rows selected.
這裏查詢的是MGMTDB的路徑,也可以直接用如下命令查詢:
[grid@rac2 /]$ oclumon manage -get reppath
CHM Repository Path =+OCR_VOTING/_MGMTDB/DATAFILE/sysmgmtdata.260.854939737
[grid@rac2 /]$
--查詢MGMTDB用戶:
SQL> select username,account_status fromdba_users where username like 'CH%';
USERNAME ACCOUNT_STATUS
------------- ----------------
CHM OPEN
CHA OPEN
--------------------------------------------------------------------------------------------
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