Environment Variables (Windows NT) 
Example:
SAPSID
or sapsid refers to the name of the R/3 System (SAP System ID).DBSID
or dbsid refers to the name of the database instance (database instance system ID).When a single instance is installed,
SAPSID and DBSID are the same.Standard:<drive>:
Example:
D:\orantStandard: <drive>:\
Example:
E:\oracle\C11
The variables
ORACLE_SID , ORACLE_HOME and SAPDATA_HOME must always be set during installation. There is no default.
The following environment variables must only be set if the corresponding paths deviate from the defaults specified here:
Default value: %SAPDATA_HOME%\saparch
Default value: %SAPDATA_HOME%\sapbackup
Default value: %SAPDATA_HOME%\sapcheck
Default value: %SAPDATA_HOME%\sapreorg
Default value: %SAPDATA_HOME%\saptrace
Default value: %SAPDATA_HOME%\sapdata1
(Analog for
SAPDATA<n>, n=1,...99).Note
: You can distribute the SAPDATA directories across several different drives, without defining the environment variables SAPDATA<n>. The environment variables only have to be defined individually if directories are used that deviate from the default. The drive is automatically recognized by SAPDBA.
Other environment variables that can be set:
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See Note 29324 for setting options.