Tmaxtibero Co., Ltd.

Tmaxdata Co., Ltd.

Dongyun Yang

Sangyoung Park

Jaemin Oh

Hakju Kim

Sang Young Park

Ingyu Kang

Jooho Lee

Jeonghyuk Park

Sehyeon Oh

Disclosed is a method for implementing re-instantiation for a database, which is performed by a computing device, which may include: acquiring at least one redo log; acquiring an address of a data block based on the at least one redo log; acquiring information on changed matters included in a control file based on the at least one redo log; and modifying a first database based on the address of the data block and the information on the changed matters.

Method for implementing re-instantiation for database

Disclosed is a method for managing a database, which is performed by a first database server including at least one processor constituting a cluster jointly with at least one second database server. The method for managing a database may include loading, on a buffer cache, a first data block based on a first transaction for modifying the first data block located in a sharing storage shared jointly with the at least one second database server. The method may include modifying the first data block loaded on the buffer cache. The method may include determining flushing a first log generated by the modification of the first data block to the sharing storage.

Method for managing database

Disclosed is a method including setting an exclusive modification authority of a first instance for a first data block (FDB) corresponding to a first transaction of the first instance. The FDB is related to a first index node group which participates in an index structure change which occurs by the first transaction. The method includes verifying the exclusive modification authority of a second data block (SDB) corresponding to a second transaction of a second instance. The SDB is related to a second index node group which participates in the index structure change which occurs by the second transaction. When the exclusive modification authority of the first instance for at least a part of the SDB is identified, the method includes making an access of the second transaction of modifying a data block in which the exclusive modification authority of the first instance is set in the SDB be waited.

Method and device for managing the index performed in active-active database cluster environment

Disclosed is a non-transitory computer readable medium storing computer program which is executable by one or more processors. The computer program allows the one or more processors to execute the following operations for performing a pivot query when the computer program is executed by one or more processors and the operations may include: identifying one or more classification factors from a query when receiving the query from a client; generating a search table for filtering records corresponding to at least one row of a table corresponding to the query based on the one or more classification factors; and generating a result table by performing an aggregation of a plurality of records included in the table based on the search table.

Computer program for processing a pivot query

Provided is a method for managing a shared memory in a database server. The database server includes a shared memory manager which divides a shared memory into a plurality of memory chunks to manage the memory chunks and allocates at least one memory chunk to a cache memory manager based on a request of the cache memory manager; a cache memory manager which requests at least one of the plurality of memory chunks to the shared memory manager, wherein the database server includes a plurality of cache memory managers and the database server uses the memory chunk which is allocated to the cache memory manager as a cache memory having a predetermined purpose, and the predetermined purposes of the plurality of cache memory managers are different from each other; and a main processor which performs a database operation using the cache memory.

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Seoul, South Korea

Dongyun Yang