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繼上次在PVE環境上搭建了oracle12C RAC環境(請參考博文“ProxmoxVE 之 安裝oracle12C rac集群”)并且安裝使用CDB和PDB(請參考博文“ProxmoxVE 之 安裝oracle12C 數據庫(CDB和PDB)”)之后，繼續往下深入，在這個RAC環境中安裝第二個CDB，驗證一個RAC環境下面使用多個CDB和PDB的復雜應用情況。

使用oracle賬號登錄系統，然后執行dbca進行安裝：

這里選擇中文字符集：

登錄grid賬號運行 crsctl stat res -t? 檢查rac狀態，看看新建的cdb2 數據庫是否成功啟動并open：

grid@oraclenode2?~]$?crsctl?stat?res?-t

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

Name???????????Target??State????????Server???????????????????State?details

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

Local?Resources

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

ora.ASMNET1LSNR_ASM.lsnr

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.DATA.dg

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.GRID.dg

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.LISTENER.lsnr

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.RECOVERY.dg

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.SYSTEM.dg

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.chad

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.net1.network

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.ons

ONLINE??ONLINE???????oraclenode1??????????????STABLE

ONLINE??ONLINE???????oraclenode2??????????????STABLE

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

Cluster?Resources

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

ora.LISTENER_SCAN1.lsnr

1????????ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.MGMTLSNR

1????????ONLINE??ONLINE???????oraclenode2??????????????169.254.210.79?192.1

68.170.33,STABLE

ora.asm

1????????ONLINE??ONLINE???????oraclenode2??????????????Started,STABLE

2????????ONLINE??OFFLINE???????????????????????????????STABLE

3????????ONLINE??ONLINE???????oraclenode1??????????????Started,STABLE

ora.cdb2.db

1????????ONLINE??ONLINE???????oraclenode1??????????????Open,HOME=/data/orac

le/app/oracle/produc

t/12.2.0.1/db_1,STAB

LE

2????????ONLINE??ONLINE???????oraclenode2??????????????Open,HOME=/data/orac

le/app/oracle/produc

t/12.2.0.1/db_1,STAB

LE

ora.cvu

1????????ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.mgmtdb

1????????ONLINE??ONLINE???????oraclenode2??????????????Open,STABLE

ora.oraclenode1.vip

1????????ONLINE??ONLINE???????oraclenode1??????????????STABLE

ora.oraclenode2.vip

1????????ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.orcl.db

1????????ONLINE??ONLINE???????oraclenode1??????????????Open,HOME=/data/orac

le/app/oracle/produc

t/12.2.0.1/db_1,STAB

LE

2????????ONLINE??ONLINE???????oraclenode2??????????????Open,HOME=/data/orac

le/app/oracle/produc

t/12.2.0.1/db_1,STAB

LE

ora.qosmserver

1????????ONLINE??ONLINE???????oraclenode2??????????????STABLE

ora.scan1.vip

1????????ONLINE??ONLINE???????oraclenode2??????????????STABLE

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

上面可以看到cdb2數據庫也已經起來了。也就是說這個RAC集群上面同時運行了2個CDB數據庫，一個是orcl數據庫，一個是cdb2數據庫，實現了同時運行多個CDB數據庫，每個CDB內又可以運行多個PDB數據庫，這樣可以實現比較復雜的業務場景。

多個CDB數據庫切換：

有了多個CDB，如何在多個CDB中進行切換？是通過切換環境變量ORACLE_UNQNAME和ORACLE_SID來實現：#現在環境變量指向是orcl數據庫CDB：

[oracle@oraclenode1?~]$

[oracle@oraclenode1?~]$?env|grep?ORA

ORACLE_UNQNAME=orcl

ORACLE_SID=orcldb11

ORACLE_BASE=/data/oracle/app/oracle

ORACLE_HOSTNAME=oraclenode1

ORACLE_TERM=xterm

ORACLE_HOME=/data/oracle/app/oracle/product/12.2.0.1/db_1

[oracle@oraclenode1?~]$?sqlplus?/?as?sysdba

SQL*Plus:?Release?12.2.0.1.0?Production?on?Thu?Jan?17?09:48:24?2019

Copyright?(c)?1982,?2016,?Oracle.??All?rights?reserved.

Connected?to:

Oracle?Database?12c?Enterprise?Edition?Release?12.2.0.1.0?-?64bit?Production

SQL>?show?con_name;

CON_NAME

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

CDB$ROOT

SQL>?quit

Disconnected?from?Oracle?Database?12c?Enterprise?Edition?Release?12.2.0.1.0?-?64bit?Production

[oracle@oraclenode1?~]$

#現在改變環境變量ORACLE_UNQNAME和ORACLE_SID，改為指向cdb2。

#注意ORACLE_SID需要指向你所在的rac數據庫實例，我這里的SID有2個，一個是CDB21，一個是CDB22，需要根據實際環境進行設定：

[oracle@oraclenode1?~]$?export?ORACLE_UNQNAME=cdb2

[oracle@oraclenode1?~]$?ORACLE_SID=cdb21

[oracle@oraclenode1?~]$?sqlplus?/?as?sysdba

SQL*Plus:?Release?12.2.0.1.0?Production?on?Thu?Jan?17?09:49:17?2019

Copyright?(c)?1982,?2016,?Oracle.??All?rights?reserved.

Connected?to:

Oracle?Database?12c?Enterprise?Edition?Release?12.2.0.1.0?-?64bit?Production

SQL>?show?con_name;

CON_NAME

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

CDB$ROOT

SQL>?select?con_id,?dbid,?guid,?name?,?open_mode?from?v$pdbs;

CON_ID?DBID?GUID

----------?----------?--------------------------------

NAME

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

OPEN_MODE

----------

2?1189951802?7F93FC28620574A8E0532001A8C0A08A

PDB$SEED

READ?ONLY

3?3521891460?7F9433F3F69A1333E0532101A8C089D8

CDB2_PDB1

READ?WRITE

CON_ID?DBID?GUID

----------?----------?--------------------------------

NAME

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

OPEN_MODE

----------

SQL>?quit

Disconnected?from?Oracle?Database?12c?Enterprise?Edition?Release?12.2.0.1.0?-?64bit?Production

[oracle@oraclenode1?~]$

總結：

oracle12C數據庫上可以創建多個CDB，每個CDB內可以創建多個PDB，管理多個CDB可以通過切換不同的SID環境變量進行切換。如果是RAC環境，數據庫實例會同時運行在所有RAC節點上。

多個CDB可以靈活使用asm磁盤組，多個CDB可以共用asm磁盤組，也可以單獨使用磁盤組，非常靈活。

總結

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