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# Query Sequencing

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With query sequencing, you can access a sequence resource using custom read (`ValueReadQuery`) and update (`DataModifyQuery`) queries and a preallocation size that you specify. This allows you to perform sequencing using stored procedures and allows you to access sequence resources that are not supported by the other sequencing types that TopLink provides.

Currently, you can only configure query sequencing in Java using the `QuerySequence` class (for more information, see "Configuring Query Sequencing").