Beijing Volcano Engine Technology Co., Ltd.

China Petroleum Chemical Corporation

Leilei Hu

Zhaowei Huang

Kejian Ju

Junling Du

Xuan Luo

Yuanpu Ding

Hongjun E

Heju Zhu

Xiuhua Sui

Pengfei Liao

A data reading and writing method, apparatus and electronic device are provided. In one embodiment, the method includes: receiving a data reading and writing request for a first database, wherein the first database stores data in a column-oriented storage format, the data reading and writing request is used for reading/writing data from/into a row storage table, the first database includes a front-end node and a back-end node, the front-end node is used for receiving the data reading and writing request and the back-end node is used for storing data; parsing the data reading and writing request in the front-end node and sending a parsing result to the back-end node; and reading/writing data from/into a second database by using the parsing result in the back-end node, wherein the first database calls data from the second database, and the second database stores data in a row-oriented storage format.

Data reading and writing method, electronic device and medium

A method and an apparatus for executing a data processing task in a cluster mixed deployment scenario and a device are provided. A first electronic device is provided with computing nodes of at least two data engines. A specific implementation of the method includes: in response to a first data engine node receiving a first data processing task, determining a first memory occupancy corresponding to the first data processing task, where the first data engine node is deployed on the first electronic device and belongs to a first data engine; and determining whether to execute the first data processing task based on a second memory occupancy corresponding to another data engine node, where the another data engine node is deployed on the first electronic device and belongs to another data engine other than the first data engine in the at least two data engines.

Method for executing data processing task in cluster mixed deployment scenario, electronic device and storage medium

A data query method based on Doris includes: acquiring history data in a bottom operator in a storage engine architecture of the Doris, and performing an aggregation calculation on the history data to obtain an aggregation result of the history data; caching, by a preset cache system, the aggregation result of the history data; performing an aggregation calculation on real-time data in a newly inserted bottom operator in the Doris, in response to a data query request, to obtain an aggregate result of the real-time data; acquiring the aggregation result of the history data from the preset cache system, and merging the aggregation result of the history data with the aggregation result of the real-time data to obtain merged data; and sending, by a data sending operator in the Doris, the merged data to an upper layer of an execution engine, to output a final data query result.

Data query method and apparatus based on Doris, storage medium and device

Embodiments of the present disclosure provide a data query method based on on-line analytical processing, an electronic device and a storage medium. The method includes: receiving a first query request, and determining a request type of the first query request; executing a query in a row-based storage portion of an event table of a database in response to the request type being a preset type; and generating a query result based on retrieved target data, wherein the event table includes a column-based storage portion and the row-based storage portion, and the column-based storage portion includes a plurality of data rows; and the row-based storage portion includes a coding column, and each piece of coded information in the coding column includes row data belonging to a same data row in the column-based storage portion.

Data query method based on on-line analytical processing, electronic device and storage medium

Disclosed is a magnetic dendrimer compound and a method for preparing the magnetic dendrimer compound, the molecular formula of which is shown in formula (I): &#x393;(CH)NRR(I). In this formula, &#x393; indicates magnetic particles coated with SiOon a surface thereof, the magnetic particles having been modified by a silane coupling agent; (CH)NRis a dendritic group, and Ris a lipophilic group, with 0&#x2266;n&#x2266;100. Further disclosed is a lubricant comprising the magnetic dendrimer compound.

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Beijing, China

Leilei Hu