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Installation Options 
During the installation of NetWeaver, you have various options for how to set up User Management Engine (UME):
· Combined AS for ABAP + Java installation
If you install an AS for ABAP + Java, UME is automatically set up to use the ABAP user management of the same Web AS installation. This option uses the configuration file dataSourceConfiguration_abap.xml. For more information, see SAP NetWeaver AS ABAP User Management as Data Source.
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· AS for Java installation
If you install SAP NetWeaver ASfor Java only, you have the following options:
¡ Use Java System Database
Use this option either if you want to run a standalone SAP Web AS Java with users and groups in the Java system database, or if you want to subsequently connect an LDAP directory to the UME. This option uses the configuration file dataSourceConfiguration_database_only.xml. For more information, see Database Only as Data Source.
¡ Use ABAP System for Users and Groups
Use this option to use the ABAP user management of your preexisting ABAP system. This option uses the configuration file dataSourceConfiguration_abap.xml. For more information, see SAP NetWeaver AS ABAP User Management as Data Source.
SAP Note 718383