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# Descriptor Query Manager

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Each relational and EIS descriptor provides an instance of `DescriptorQueryManager` that you can use to configure the following:

- named queries (see "Configuring Named Queries at the Descriptor Level")

- custom default queries for basic persistence operations (see "Configuring Default Query Implementations")

- additional join expressions (see "Configuring Additional Join Expressions")

For more information on using the query manager, see "Descriptor Query Manager Queries".