Query method for a distributed database system and query apparatus

摘要

A method, system, and/or computer program product queries a distributed database system. In one embodiment, the query method comprises: parsing a query request; generating an access plan for the query request, wherein the access plan specifies therein a database table related to the query request, and the database table has a plurality of copies stored in different database devices respectively; selecting, based on status information of each of the plurality of copies of the specified database table, one copy from the plurality of copies as a target database table; and executing a query operation in the target database table according to the access plan.