A system includes generation of a query to retrieve, from a first database table, a result set conforming to query parameters for all entries of a second table stored in a volatile memory of a query client, serialization of the second table into the volatile memory, copying of the serialized second table into a second volatile memory of a data server, de-serialization of the serialized second table into the second volatile memory, determination of a plurality of entries of the first database table which are associated with the second table, and determination of the result set from the plurality of entries based on the query parameters.