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# Configuring a Data Source Login

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This chapter describes how to configure TopLink data source logins.

Table: Configuring TopLink Data Source Logins lists the types of TopLink data source logins that you can configure and provides a cross-reference to the type-specific chapter that lists the configurable options supported by that type.

Configuring TopLink Data Source Logins

If you are configuring a... | See...
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DatabaseLogin | Configuring a Database Login
EISLogin | Configuring an EIS Login

Table: Common Data Source Login Options lists the configurable options shared by two or more TopLink data source login types.

When using the `sessions.xml` file to configure login information, TopLink will override any login information in the `project.xml` and instead use the information from the `sessions.xml` configuration. For more information, see "Understanding Data Access".