Oracle Internet Directory Replication (OID Replication)

(LESSON 26)

Note on the following important terms from Oracle:

-         Replica: The copy of a naming context contained within a server is called a replica.

-         Suppliers: The OID servers in the DRG (Directory Replication Group) that hold updatable replicas or naming contexts are called suppliers.

-         Consumers: The OID servers in the DRG to which the updates made on suppliers are propagated are called consumers.

-         Directory Replication Group: A set of OID servers that participate in the replication of a given naming context is called a Directory Replication Group (DRG).

-         Replication agreement: A special directory entry that represents the replication relationship among the OID servers in a DRG.

-         Change log purging: After the OID Replication server applies the changes to the consumer, the change entries are purged. Purging of the change log entries can be done by two different methods such as Change number based or Time based.

Setting Oracle Internet Directory Replication

To perform this configuration, you should have two different machines. Let us named them: The MASTER and REMOTE machines

Install complete OracleAS Infrastructure on the MASTER server with the following setting:

(For example)

ORACLE_HOME=/u01/oracle/inframaster

ORACLE_SID=inframaster

Oracle Database Global Name=inframaster.iselfschooling.com

Install OracleAS Infrastructure without any of the default component option on the REMOTE server with the following setting:

Notice that since you have not selected any component to install, the installer will prompt you to register this installation against an OID server. Enter the OID server host name and port number of the MASTER server.

(For example)

ORACLE_HOME=/u01/oracle/infraremote

ORACLE_SID=infraremote

Oracle Database Global Name=infraremote.iselfschooling.com

Stop the OID server LDAP instance on the MASTER server:

# $ORACLE_HOME/bin/oidctl connect=inframaster.iselfschooling.com

Instance=1 server=oidldapd flags=’-p 3060’ stop

On the REMOTE server, create a wallet

# $ORACLE_HOME/bin/oidpasswd connect=infraremote.iselfschooling.com

create_wallet=true

Notice that you should use the password of ODS schema in the metadata repository. The default password of the ODS schema is ods. You can also use the orcladmin’s password.

On the MASTER server, start the OIDMON and OIDLDAP processes

# $ORACLE_HOME/bin/oidmon connect=infraremote.iselfschooling.com start

# $ORACLE_HOME/bin/oidctl connect=inframaster.iselfschooling.com

instance=1 server=oidldapd flags=’-p 3060’ start

Stop the OIDMON process on the REMOTE server

# $ORACLE_HOME/bin/oidmon connect=infraremote.iselfschooling.com stop

Modify the tnsnames.ora file and include a net service name entry for the REMOTE repository database in the MASTER server and the MASTER repository database in the REMOTE server.

Assuming the service names are master and remote, try to tnsping them.

For example:

Go to the REMOTE server and execute the following command: # tnsping master

Go to the MASTER server and execute the following command: # tnsping remote

Set up the ASR-based replication.

Go to the MASTER server, execute the following command:

# $ORACLE_HOME/bin/remtool –asrsetup –v

Answer to all questions. After the setup is completed, remtool will display you the confirmation and the status of the replication setup.

Start the OID LDAP server instances on the MASTER and REMOTE servers.

On MASTER:

# $ORACLE_HOME/bin/oidctl connect=inframaster.iselfschooling.com instance=1 server=oidldapd flags=’-p 3060’ start

On REMOTE

# $ORACLE_HOME/bin/oidmon connect=infraremote.iselfschooling.com start

Start the OID Replication server instance on the MASTER and REMOTE servers.

On MASTER:

# $ORACLE_HOME/bin/oidctl connect=inframaster.iselfschooling.com instance=1 server=oidrepld flags=’-p 3060’ start

On REMOTE:

# $ORACLE_HOME/bin/oidctl connect=infraremote.iselfschooling.com instance=1 server=oidldapd flags=’-p 3060’ start

To verify whether the replication is working, start ODM form both the MASTER and REMOTE servers and wait for the entries to be replicated from them.