Patents by Inventor Kyu Hwan Kim

Kyu Hwan Kim has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160371319
    Abstract: Technologies are described for performing synchronization within a database environment. A source host stores multiple database tables and a replica host stores copies of the multiple database tables. During synchronization, replication log replay is blocked at the replica node, and a multithreaded process locks the multiple database tables of the source hosts, reactivates replication log generation for each of the multiple database tables, and then unlocks the database tables. A synchronization timestamp is acquired and used to synchronize the multiple database tables with the copies of the multiple database tables. After synchronization, replication log replay is reactivated at the replica host for the copies of the multiple database tables.
    Type: Application
    Filed: September 30, 2015
    Publication date: December 22, 2016
    Applicant: SAP SE
    Inventors: Chang Gyoo Park, Deok Koo Kim, Kyu Hwan Kim, Juchang Lee
  • Publication number: 20160371357
    Abstract: Technologies are described for performing replication within a database environment. Where a database transaction is replicated at multiple replica nodes, a replica node is selected as a coordinator replica node for the transaction. The other replica node or nodes are designated as follower replica nodes for the transaction. A follower replica node sends the coordinator replica node a precommit notification when the follower replica node has precommitted the transaction. The coordinator replica node sends the follower replica node a postcommit notification to commit the transaction when the transaction has been precommitted by all of the replica nodes to which the transaction is to be replicated.
    Type: Application
    Filed: September 30, 2015
    Publication date: December 22, 2016
    Applicant: SAP SE
    Inventors: Chang Gyoo Park, Juchang Lee, Kyu Hwan Kim, Hyoung Jun Na, Hyejeong Lee
  • Publication number: 20160147859
    Abstract: Disclosed herein are system, method, and computer program product embodiments for replicating a database transaction to a replica table. An embodiment operates by receiving a replication log entry and an associated transaction commit log entry for a database transaction to be replayed to a row at a replica table. A row-ID value of the replication log entry is compared to a row-ID column value of the row at the replica table. The replication log entry is then replayed at a parallel log replayer based on the comparison. The database transaction is then committed to the replica table by replaying the associated transaction commit log entry at a transaction log replayer.
    Type: Application
    Filed: March 13, 2015
    Publication date: May 26, 2016
    Inventors: Juchang Lee, Chang-Gyoo Park, Hyoung-Jun Na, Kyu-Hwan Kim
  • Publication number: 20160147617
    Abstract: Disclosed herein are system, method, and computer program product embodiments for minimizing table lock duration during lost change resynchronization between a source table and a replica table. An embodiment operates by detecting a restart at a source node or a replica node. A source table at the source node is then locked based on the detection. A database transaction is then created for a lost change resynchronization operation and the source table is unlocked. The database transaction is then compared to another database transaction based on its timestamp. Based on the comparison, either the database transaction for the lost change resynchronization operation or the other database transaction is executed.
    Type: Application
    Filed: March 13, 2015
    Publication date: May 26, 2016
    Inventors: Juchang Lee, Joo-Yeon Lee, Kyu-Hwan Kim, Deck-Hoe Kim, Kyungyul Park
  • Publication number: 20160147618
    Abstract: Disclosed herein are system, method, and computer program product embodiments for synchronizing lost change between a source table and a replica table. An embodiment operates by detecting a restart at a source node or a replica node. Row-ID values of replication log entries are then compared to row-ID column values of rows at a replica table of the replica node. Replication errors at a source table or the replica table are then determined based on the row-ID comparison. The rows of the source table and the replica table are then updated based on the determination.
    Type: Application
    Filed: March 13, 2015
    Publication date: May 26, 2016
    Inventors: Juchang LEE, Kyu-Hwan Kim, Hyoung-Jun Ne, Chang-Gyoo Park, Hyejeong Lee
  • Publication number: 20150149704
    Abstract: For each data change occurring transaction created as part of a write operation initiated for one or more tables in a main-memory-based DBMS, a transaction log entry can be written to a private log buffer corresponding to the transaction. All transaction log entries in the private log buffer can be flushed to a global log buffer upon completion of the transaction to which the private log buffer corresponds.
    Type: Application
    Filed: April 3, 2014
    Publication date: May 28, 2015
    Inventors: Juchang Lee, Beomsoo Kim, Kyu Hwan Kim, Jaeyun Noh, Sang Kyun Cha
  • Publication number: 20150149426
    Abstract: Innovations in the area of server-side processing when committing transactions to disk in a distributed database system can improve computational efficiency at database nodes and/or reduce network bandwidth utilization. For example, when transactions are committed in a database system, at a master node of the database system, a server uses different threads for certain processor-intensive operations and certain I/O-intensive operations. Or, as another example, when transactions are committed in a database system, at a master node of the database system, a server groups jobs for I/O requests.
    Type: Application
    Filed: April 17, 2014
    Publication date: May 28, 2015
    Inventors: Kyu Hwan Kim, Juchang Lee
  • Publication number: 20150149409
    Abstract: Technologies are described for performing replication within a database environment. For example, replication of database data can be performed using data manipulation language (DML) statements and logical logs. A database node can execute a DML statement, create a logical log comprising the DML statement, and insert the logical log into a logical log queue. The logical log can be sent to one or more other database nodes for execution of the DML statement stored within the logical log. Logical logs can be grouped for sending to other nodes. Logical logs can be executed on a first node and one or more other nodes within the same transaction boundary. Execution of DML statements can be decoupled from sending, receiving, grouping, and/or processing of logical logs.
    Type: Application
    Filed: June 11, 2014
    Publication date: May 28, 2015
    Inventors: Joo Yeon Lee, Juchang Lee, Kyu Hwan Kim, Chul Won Lee, Yong Sik Kwon, Sang Kyun Cha
  • Publication number: 20020015829
    Abstract: Disclosed is heat transfer paper for a label made of a thermosetting material and a method of manufacturing the same, and more particularly, to heat transfer paper for a label made of a thermosetting material and a method of manufacturing the same which is capable of providing a substantially complete three-dimensional effect to the label that is attached on various kinds of articles such as clothing and adopting heat adhesion manner on a material to which the label adheres. Generally, in case where a thermal bond is applied on the silicone rubber, however, there occurs a problem that the adhesive force is remarkably weakened due to the oil contained in the silicone rubber. Therefore, the heat transfer paper according to the present invention can be provided with a silicone rubber layer formed by a depressed mold and a color layer on the surface of the silicone rubber layer, thereby achieving a high quality of label having various colors and a sophisticated outer appearance line.
    Type: Application
    Filed: July 18, 2001
    Publication date: February 7, 2002
    Inventor: Kyu Hwan Kim