Coupang, Corporation

Beijing Const Instruments Technology Inc.

Zhiyong Huang

Bin Dong

Zhan Chen

Chuanchuan Han

Junzhao Zhang

Gang Wang

Xin Peng Liu

Rui Li

Xin Liu

Chunhui Wan

Wei Ji

Hongjun Gao

Xilei Tian

Fengshan Dong

Licheng Li

Methods and systems for database query efficiency improvement are disclosed. In one embodiment, a method includes mirroring a primary database to a secondary database; creating a testing database comprising the schema; receiving a query; running the query on the testing database; and evaluating the query by: identifying predicates in the query; determining most common values for each column name by querying the secondary database; creating, for each column name, a list comprising at least one of the most common values; creating a test predicate comprising one of the column names and an entry for the list corresponding to the column name; creating a test query comprising one or more test predicates; determining a resource utilization of the query by running each of the test queries on the secondary database; and providing, to a user interface for display, an efficiency improvement recommendation when the resource utilization exceeds a threshold.

Systems and methods for database query efficiency improvement

Systems and methods for managing a highly available distributed hybrid database comprising: a memory storing instructions; and one or more processors configured to execute the instructions to: receive a query from a user device to retrieve data from a distributed database comprising a source node, a first plurality of replica nodes, and a second plurality of replica nodes, wherein the source node and the first plurality of replica nodes form a transactional cluster, and wherein the second plurality of replica nodes forms an analytical cluster; determine whether to process the query using the transactional cluster or the analytical cluster based on one or more rules; translate the query into a first protocol that the determined cluster comprehends; select a replica node corresponding to the determined cluster; process the query using the selected replica node; and send data associated with results from processing the query to the user device.

Systems and methods for managing a highly available distributed hybrid transactional and analytical database

Systems and methods for managing a highly available distributed database comprising: a memory storing instructions; and one or more processors configured to execute the instructions to: determine that a source node, in a distributed database comprising the source node and one or more replica nodes, is not available; select a most-updated replica node from the one or more replica nodes; switch a role of the most-updated replica node to source; update a data store to label the source node as unavailable and the selected replica node as being a promoted source node; send a notification to a user device to update a database topology based on the updated data store; determine whether the user device has updated the database topology; and upon determining the user device has not updated the database topology, continue to send the notification to the user device until the user device has updated the database topology.

Systems and methods for managing a highly available and scalable distributed database in a cloud computing environment

A fully-automated handheld pressure calibrator, comprising a housing, and gas circuit and electrical circuit components installed in the housing. The gas circuit components comprise a pressure source capable of supplying a pressurized gas. The gas circuit and electrical circuit components are integrated and installed in the housing in a modular manner, and the shape of the housing is suitable to be held in a hand. The pressure calibrator of the present invention enables all kinds of functions including pressure generation, pressure control, pressure instrument connection, and recording, result calculation, and report output of a pressure calibration process, and is suitable for on-site an on-line calibration of a pressure instrument.

Fully-automated handheld pressure calibrator

Growing community of inventors

Beijing, China

Zhiyong Huang