Two versions of oracle are installed on one host.

   Install BW and ERP on a server, while BW uses the oracle9 environment, while ERP uses the oracle10 environment. to install two versions of oracle, you need to make some minor changes, two services on the other side cannot be started at the same time. The procedure is as follows:

1. Changes in listener. ora
In order that both ORACLE users (Limit 11 and limit 12) can start the listener process, the two databases must be entered in both listener. ora files. edit the following file as shown below: Oracle 8.0.x:/oracle/C11/network/admin/listener. oraOracle 8.1.x or higher:/oracle/C11/<ORACLE_VERSION >_< BIT>/network/admin/listener. ora (<ORACLE_VERSION is the 3-digit version and '64' for a 64-bit database, e.g. /oracle/C11/920_64/network/admin/listener. ora for 64-bit Oracle 9.2.0)                           Replace these placeholders with the actual values: C11, C12, DBHOSTNAME, ORACLE_HOME_C11, ORACLE_HOME_C12.                           Ensure that lines which begin with a keyword and not a bracket do not contain any leading blank characters.
Make sure that the file belongs to the user limit 11 and has at least permissions 0644.

################# Filename......: listener.ora for more than one database# Created.......: created by SAP AG, R/3 Rel. >= 4.0A# Name..........:# Date..........:################LISTENER =  (ADDRESS_LIST =        (ADDRESS=          (PROTOCOL=IPC)          (KEY= C11.WORLD)        )        (ADDRESS=          (PROTOCOL=IPC)          (KEY= C11)        )        (ADDRESS=          (PROTOCOL=IPC)          (KEY= C12.WORLD)        )        (ADDRESS=          (PROTOCOL=IPC)          (KEY= C12)        )        (ADDRESS =          (COMMUNITY = SAP.WORLD)          (PROTOCOL = TCP)          (HOST = DBHOSTNAME)          (PORT = 1527)        )  )STARTUP_WAIT_TIME_LISTENER = 0CONNECT_TIMEOUT_LISTENER = 10TRACE_LEVEL_LISTENER = OFFSID_LIST_LISTENER =  (SID_LIST =    (SID_DESC =      (SDU = 32768)      (SID_NAME = C11)      (ORACLE_HOME = ORACLE_HOME_C11)      (PRESPAWN_MAX = 10)    )    (SID_DESC =      (SDU = 32768)      (SID_NAME = C12)      (ORACLE_HOME = ORACLE_HOME_C12)      (PRESPAWN_MAX = 10)    )  )

 

 

Copy this file toIf C12 has Release 3.0/3.1:/etc/listener. oraIf C12 has Release 4.x or higher with Oracle 8.0.x:/oracle/C12/network/admin/listener. oraIf C12 has Release 4.x or higher with Oracle 8.1.x or higher:/oracle/C12/<ORACLE_VERSION >_< BIT>/network/admin/listener. ora                           Make sure that the file there belonges to the user created 12 and has at least permissions 0644.2. Changes in tnsnames. ora
Edit the following file as shown below:

 

Oracle 8.0.x:/oracle/C11/network/admin/tnsnames. oraOracle 8.1.x or higher:/oracle/C11/<ORACLE_VERSION >_< BIT>/network/admin/tnsnames. ora                           Replace the placeholders with the actual values: C11, C12, DBHOSTNAME.                           Ensure that lines which begin with a keyword and not a bracket do not contain any leading blank characters.                           Make sure that the file belongs to the user limit 11 and has at least permissions 0644.
 

################# Filename......: tnsnames.ora# Name..........: LOCAL_REGION.world# Date..........:################C11.world =  (DESCRIPTION =    (SDU = 4096)    (ADDRESS_LIST =        (ADDRESS =          (COMMUNITY = sap.world)          (PROTOCOL = TCP)          (HOST = DBHOSTNAME)          (PORT = 1527)        )    )    (CONNECT_DATA =       (SID = C11)       (GLOBAL_NAME = C11.world)    )  )C12.world =  (DESCRIPTION =    (SDU = 4096)    (ADDRESS_LIST =        (ADDRESS =          (COMMUNITY = sap.world)          (PROTOCOL = TCP)          (HOST = DBHOSTNAME)          (PORT = 1527)        )    )    (CONNECT_DATA =       (SID = C12)       (GLOBAL_NAME = C12.world)    )  )

 

    Copy the file toIf C12 has Release 3.0/3.1:/usr/sap/trans/tnsnames. oraIf C12 has Release 4.x or higher with Oracle 8.0.x:/oracle/C12/network/admin/tnsnames. oraIf C12 has Release 4.x or higher with Oracle 8.1.x or higher:/oracle/C12/<ORACLE_VERSION >_< BIT>/network/admin/tnsnames. ora                           Make sure that the file there belongs to the user created 12 and has at least permissions 0644.3. Changes in sqlnet. ora
No changes are necessary in sqlnet. ora.
4. Restart the Listener
After editing the files, restart the listener to make the changes valid tive.