Tmaxtibero Co., Ltd.

Joohyun Lee

Sangyoung Park

Kunwoo Park

Jaemin Oh

Seunghoon Park

Sangchul Kim

Yonghwa Kim

Kwangwon Park

Seonggyu Choi

Taeseop Kim

Yongkwon Kim

Seunghwan Yoo

Sangmin Kang

Geonhyoung Joe

Disclosed are methods for updating data for multiple users in a database management system performed by a computing device, comprising: determining whether there is an already modified target row during a modification task for at least one target row; generating at least one reselected target row by reselecting a modification target in the at least one target row when there is the already modified target row; determining whether there is an already modified reselected target row during a modification task for the at least one reselected target row; and omitting the modification task for the at least one reselected target row, performing the modification task for the at least one reselected target row, or performing a rollback for the modification task for the at least one reselected target row according to the type of instruction statement included in the modification query when there is the already modified reselected target row.

Method and apparatus for updating data about multiple user in database management system

A method for managing a virtual database example includes acquiring a first query related to a first object of a first virtual database, issuing an ownership of the first object through a first master front end node corresponding to the first virtual database, and altering first meta information of the first object according to the first query, through a first process which acquires the ownership of the first object. The method also includes requesting an invalidation of a first data dictionary cache about the first meta information of the first object through the first master front end node, receiving a first completion signal indicating that the invalidation of the first data dictionary cache is completed, performing first commit for an alteration of the first meta information of the first object, and collecting the issued ownership of the first object.

Apparatus and method for managing virtual database

Disclosed is a method for processing a query related to a plurality of partitions included in a plurality of tables having different partition information, which is performed by a computing device including one or more processors. The method includes acquiring the plurality of partitions for processing the query. The method includes acquiring global partition indexes for encompassing the acquired partitions and acquiring local partition indexes corresponding to the acquired partitions, respectively. The method includes processing the query at least partially based on the global partition indexes and the local partition indexes.

Method for querying tables with different partition information

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Namyangju-si, South Korea

Joohyun Lee