戴明明(Dave)
Oracle ACE-A,ACOUG核心成员,宝存科技数据库方案架构师
在Grid Infrastructure 12.1.0.2 中,已经没有该选项,GIMR 数据库已经变成了强制选项。在Oracle 12c 中Management Database 用来存储Cluster HealthMonitor (CHM/OS,ora.crf) ,Oracle Database QoS Management,Rapid Home Provisioning和其他的数据。
Management Repository 是受12c Clusterware 管理的一个单实例,在Cluster 启动的时会启动MGMTDG并在其中一个节点上运行,并受GI 管理,如果运行MGMTDG的节点宕机了,GI 会自动把MGMTDB 转移到其他的节点上。
默认情况,MGMTDB 数据库的数据文件存放在共享的设备,如OCR/Voting 的磁盘组中,但后期可以移动位置。
查看Management DB 相关的资源:
[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 ……
使用crsctl 命令可以看到ora.mgmtdb和ora.MGMTLSNR。
在操作系统层面,也可以查看到有2个对应的进程:
[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
正常情况下,MGMTDB 会在GI 启动的时候,会自动启动,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>]
一般情况下,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]$
进入$ORACLE_BASE下的trace目录。但是进入-MGMTDB时,要注意由于特殊字符的存在,不能直接cd:
[grid@rac2 _mgmtdb]$ cd -MGMTDB -bash: cd: -M: invalid option cd: usage: cd [-L|-P] [dir] [grid@rac2 _mgmtdb]$
必须使用./-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 的日志和trace 都在这个里。
MGMTDB是带一个PDB的CDB数据库
前面说了,MGMTDB 是一个实例,实际上,MGMTDB是带一个PDB的CDB库,我们可以使用GI的命令直接去操作MGMTDB 对应的PDB。
--查看MGMTDB当前节点: [grid@rac2 /]$ oclumon manage -get master Master = rac1 --查看状态: [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 --连接MGMTDB实例 [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$logfile; FILE_NAME -------------------------------------------------------------------------------- +OCR_VOTING/_MGMTDB/DATAFILE/sysaux.258.854939615 +OCR_VOTING/_MGMTDB/DATAFILE/sysgridhomedata.261.854939891 +OCR_VOTING/_MGMTDB/DATAFILE/sysmgmtdata.260.854939737 +OCR_VOTING/_MGMTDB/DATAFILE/system.259.854939661 +OCR_VOTING/_MGMTDB/DATAFILE/undotbs1.257.854939605 +OCR_VOTING/_MGMTDB/ONLINELOG/group_1.263.854940051 +OCR_VOTING/_MGMTDB/ONLINELOG/group_2.264.854940053 +OCR_VOTING/_MGMTDB/ONLINELOG/group_3.265.854940057
这里查询的是MGMTDB的路径,也可以直接用如下命令查询:
[grid@rac2 /]$ oclumon manage -get reppath CHM Repository Path =+OCR_VOTING/_MGMTDB/DATAFILE/sysmgmtdata.260.854939737 [grid@rac2 /]$ --查询MGMTDB用户: SQL> select username,account_status fromdba_users where username like 'CH%'; USERNAME ACCOUNT_STATUS ------------- ---------------- CHM OPEN CHA OPEN