Implementation method and implementation device for data duplication elimination query

Abstract

The invention discloses an implementation method and an implementation device for data duplication elimination query. The implementation method comprises the following steps: querying all database nodes in a plurality of database nodes to obtain query results, wherein for all the database nodes querying the query results, the query results queried by the database nodes are subjected to the duplication elimination operation, and the query results subjected to the duplication elimination operation are taken as the query results of the database nodes; merging the query results of the database nodes. The implementation method and the implementation device achieve the duplication elimination query operation of large-scale data in a database cluster, avoid the condition that duplication elimination query operation is confined to the duplication elimination division column, achieve the duplication elimination query to any data columns, and in addition, avoid the problem of repeated calculation in duplication elimination query, and improve the duplication elimination query efficiency.

Description

technical field [0001] The invention relates to the field of database storage, in particular to a method and device for implementing data deduplication query. Background technique [0002] Eliminating duplicate records is a common query operation type in current database systems, and this type of query is usually also called deduplicated query. For example, a database application system usually needs to list all different records, or count different records, or count the number of different records. [0003] In a single database system, currently mature methods for eliminating duplication mainly include sorting and merging methods and hash merging methods. However, in a database cluster composed of multiple independent database systems, duplicate records may be distributed on different database servers, and due to the overhead of network transmission and communication between database nodes, the cross-node data deduplication query is increased. Due to the difficulty of pro...

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Problems solved by technology

[0005] Aiming at the problems in the related technologies that the elimination of repeated queries of arbitrary data columns cannot be solved, and that there is double calculation when the query results are summarized, resulting in the unsatisfactory efficiency of eliminating repeated queries, the present invention proposes a method and realization of data deduplication query The device can solve the problem that existing related technologies cannot perform de-duplication query on large-scale data on the database cluster, and realize de-duplication query of any data column

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