How to install two installing Oracle database on a host

Hi Team,

Here i am sharing the experience of installing two oracle database on same host.

After installing new database my first database won't come up.there are some problems with listener.ora and tnsnames.ora so you have to follow this approach...

dbsid1 existing Database
dbsid2 New Database

Changes in listener.ora
################
# 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= dbsid1.WORLD)
)
(ADDRESS=
(PROTOCOL=IPC)
(KEY= dbsid1)
)
(ADDRESS=
(PROTOCOL=IPC)
(KEY= dbsid2.WORLD)
)
(ADDRESS=
(PROTOCOL=IPC)
(KEY= dbsid2)
)
(ADDRESS =
(COMMUNITY = SAP.WORLD)
(PROTOCOL = TCP)
(HOST = DBHOSTNAME)
(PORT = 1527)
)
)
STARTUP_WAIT_TIME_LISTENER = 0
CONNECT_TIMEOUT_LISTENER = 10
TRACE_LEVEL_LISTENER = OFF
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SDU = 32768)
(SID_NAME = dbsid1)
(ORACLE_HOME = ORACLE_HOME_dbsid1)
(PRESPAWN_MAX = 10)
)
(SID_DESC =
(SDU = 32768)
(SID_NAME = dbsid2)
(ORACLE_HOME = ORACLE_HOME_dbsid2)
(PRESPAWN_MAX = 10)
)
)


and tnsnames.ora should be like this:
################
# Filename......: tnsnames.ora
# Name..........: LOCAL_REGION.world
# Date..........:
################
dbsid1.world =
(DESCRIPTION =
(SDU = 4096)
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = sap.world)
(PROTOCOL = TCP)
(HOST = DBHOSTNAME)
(PORT = 1527)
)
)
(CONNECT_DATA =
(SID = dbsid1)
(GLOBAL_NAME = dbsid1.world)
)
)
dbsid2.world =
(DESCRIPTION =
(SDU = 4096)
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = sap.world)
(PROTOCOL = TCP)
(HOST = DBHOSTNAME)
(PORT = 1527)
)
)
(CONNECT_DATA =
(SID = dbsid2)
(GLOBAL_NAME = dbsid2.world)
)
)


I think it will help you.

For more clarity follow SAP Note 98252