Alipay (hangzhou) Information Technology Co., Ltd.

Shunde Cao

Lei Wang

Yang Yang

Yang Zhao

Qunshan Huang

Qingkai Mao

Jian Du

Pu Duan

Benyu Zhang

Jun Qi

Kefeng Yu

Implementations of this specification provide query optimization methods, apparatuses, and systems for secure multi-party databases. In an implementation, a method includes: receiving a current query associated with a plurality of target database of a multi-party database system, generating a plurality of execution plans for the current query, determining, for each execution plan, a respective cost computation formula of a plurality of cost computation values for computing an execution cost of jointly executing the execution plan by the plurality of target databases, receiving a secure computation result from each of a plurality of query engines corresponding to the plurality of target databases, and determining an optimal execution plan having a lowest cost value in the plurality of cost computation formulas based on the secure computation result.

Query optimization methods, apparatuses, and systems for secure multi-party database

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Hangzhou, China

Shunde Cao