Mount a database on 2 servers

Question

Hello,
I need to know if the below scenario is applicable.
I installed Oracle Software on 2 servers.
I created an Oracle database on Server A where all the it is data (redo logs, control file, spfile ....) is under /Oracle/oradata.
My question if I created an Oracle service on Server B (with the same name as the db on Server A), then I shutdown the db on Server A, I dismounted /Oracle/oradata from Server A and mounted on Server B.
Can i start the database on Server B? and it will be the same as the db that it was on Server A??
Regards,

Answer 1

Hi,
If it is a tempory solution umonting filesystem and database on node A and mounting filesystem and starting database on Node B, have no problem, since OS version and patch level is the same on both nodes, will work.... all task must be done manually.
If you want a solution to ACTIVE/PASSIVE :
If you have ORACLE SE or EE you can use ORACLE CLUSTERWARE, to make database active/passive... I'm creating a post on my blog explaing how do it. (I have not had time to finish)
Oracle Clusterware can be used to protect any application (restarting or failing over the application in the event of a failure), free of charge, if one or more of the following conditions are met:
<li> The server OS is supported by a valid Oracle Unbreakable Linux support contract.
The product to be protected is either:
<li> Any Oracle product (e.g. Oracle Applications, Siebel, Hyperion, Oracle Database EE, Oracle Database XE)
<li> Any third-party product that directly or indirectly stores data in an Oracle database
<li> At least one of the servers in the cluster is licensed for Oracle Database (SE or EE)
So if you meet one of the above conditions you can use Oracle Clusterware to make your database ACTIVE/PASSIVE
I've built this structure in some customers.
Basically it is very simple.
Install Clusterware
* Use SCAN FEATURE (It's highly recommend, because after database failover it will be transparent to your clients)
* Use ASM and ACFS
You must configure the filesystem of ORACLE_HOME and ORACLE_BASE of Database on ACFS.
Install Oracle Database without RAC Option (i.e single) in one Node. When Installation finish run root.sh in all nodes of cluster with OH of Database mounted (of course).
Create a Database with DBCA in one NODE using ASM filesystem and configure remote listener to SCAN.
You can reconfigure your database using "crsctl" to restart automatically on another nodes when node current is down:
See it:
srvctl config database -d db11g
Database unique name: db11g
Database name: db11g
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +DATA/db11g/spfiledb11g.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: db11g
Database instances: db11g
Disk Groups: DATA,FRA
Mount point paths: /u01/app/oracle/product/11.2.0/dbhome_1
Services:
Type: SINGLE
Database is administrator managed
$ crsctl status resource ora.db11g.db -f
NAME=ora.db11g.db
TYPE=ora.database.type
STATE=OFFLINE
TARGET=OFFLINE
ACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r--
ACTION_FAILURE_TEMPLATE=
ACTION_SCRIPT=
ACTIVE_PLACEMENT=1
AGENT_FILENAME=%CRS_HOME%/bin/oraagent%CRS_EXE_SUFFIX%
AUTO_START=restore
CARDINALITY=1
CARDINALITY_ID=0
CHECK_INTERVAL=1
CHECK_TIMEOUT=30
CLUSTER_DATABASE=false
CREATION_SEED=41
DATABASE_TYPE=SINGLE
DB_UNIQUE_NAME=db11g
DEFAULT_TEMPLATE=PROPERTY(RESOURCE_CLASS=database) PROPERTY(DB_UNIQUE_NAME= CONCAT(PARSE(%NAME%, ., 2), %USR_ORA_DOMAIN%, .)) ELEMENT(INSTANCE_NAME= %GEN_USR_ORA_INST_NAME%) ELEMENT(DATABASE_TYPE= %DATABASE_TYPE%)
DEGREE=1
DESCRIPTION=Oracle Database resource
ENABLED=1
FAILOVER_DELAY=0
FAILURE_INTERVAL=60
FAILURE_THRESHOLD=1
GEN_AUDIT_FILE_DEST=/u01/app/oracle/product/11.2.0/dbhome_1/admin/db11g/adump
GEN_START_OPTIONS=
GEN_START_OPTIONS@SERVERNAME(lnxora01)=open
GEN_START_OPTIONS@SERVERNAME(lnxora02)=open
GEN_USR_ORA_INST_NAME=
GEN_USR_ORA_INST_NAME@SERVERNAME(lnxora01)=db11g
GEN_USR_ORA_INST_NAME@SERVERNAME(lnxora02)=db11g
HOSTING_MEMBERS=
ID=ora.db11g.db
INSTANCE_FAILOVER=1
LOAD=1
LOGGING_LEVEL=1
MANAGEMENT_POLICY=AUTOMATIC
NLS_LANG=
NOT_RESTARTING_TEMPLATE=
OFFLINE_CHECK_INTERVAL=0
ONLINE_RELOCATION_TIMEOUT=0
ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1
PLACEMENT=restricted
PROFILE_CHANGE_TEMPLATE=
RESTART_ATTEMPTS=2
ROLE=PRIMARY
SCRIPT_TIMEOUT=60
SERVER_POOLS=ora.db11g
SPFILE=+DATA/db11g/spfiledb11g.ora
START_DEPENDENCIES=hard(ora.DATA.dg,ora.FRA.dg,ora.ohome_112.ohome_112.acfs) weak(type:ora.listener.type,uniform:ora.ons) pullup(ora.DATA.dg,ora.FRA.dg)
START_TIMEOUT=600
STATE_CHANGE_TEMPLATE=
STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DATA.dg,shutdown:ora.FRA.dg,shutdown:ora.ohome_112.ohome_112.acfs)
STOP_TIMEOUT=600
TYPE_VERSION=2.2
UPTIME_THRESHOLD=1h
USR_ORA_DB_NAME=db11g
USR_ORA_DOMAIN=
USR_ORA_ENV=
USR_ORA_FLAGS=
USR_ORA_INST_NAME=db11g
USR_ORA_OPEN_MODE=open
USR_ORA_OPI=false
USR_ORA_STOP_MODE=immediate
VERSION=11.2.0.2.0
srvctl status database -d db11g
Instance db11g is running on node lnxora01
srvctl start database -d db11g -n lnxora02
PRCC-1014 : db11g was already running
PRCR-1004 : Resource ora.db11g.db is already running
PRCR-1079 : Failed to start resource ora.db11g.db
CRS-5702: Resource 'ora.db11g.db' is already running on 'lnxora01'Force Shutdown (halt) node lnxora01, database is automatically started on node lnxora02
$ crsctl status res ora.db11g.db -t
NAME           TARGET  STATE        SERVER                   STATE_DETAILS
Cluster Resources
ora.db11g.db
      1        ONLINE  ONLINE       lnxora02                  OpenStarting node lnxora01 database db11g will be on lnxora02, if you want start on node lnxora01 you must manually stop on lnxora02 and start on lnxora01.
Above is only a example, I'm not sure that I will work as you want, so you should perform their own testing and configuration.
This is completely possible. We just need to make sure and certain that it will not cause any problem in databases.
Important: This solution is not approved by Oracle. The risk is at your own.
Also you can create your own scripts to stop, start and relocate your database, it's approved by Oracle.
Making Applications Highly Available Using Oracle Clusterware
http://docs.oracle.com/cd/E11882_01/rac.112/e16794/crschp.htm
The solution certified for active/passive is to use RAC One Node.
Regards,
Levi Pereira
Edited by: Levi Pereira on Feb 9, 2012 3:36 PM
Edited by: Levi Pereira on Feb 9, 2012 3:44 PM