Abstract: A fusion query method and a multi-model database (MMDB) framework are provided, to add a capability of extending a foreign engine in a relational database engine and manage metadata of the foreign extensible engine by using a user table. This minimizes intrusion to the relational database engine, and implements dynamic loading and unloading of the foreign engine during runtime. Therefore, a maintenance interface and uniform data access to a multi-model database such as a relational database, a graph database, or a time series database are provided for a user, so that learning and use costs of operation and maintenance personnel and application development personnel are reduced, and security of data use is improved.

Abstract: A time series data injection method is provided, including: receiving time series data, where the time series data includes at least one parameter identifying a data source that generates the time series data, an indicator indicating at least one attribute of the data source, and a timestamp indicating a time point when the indicator is generated; storing a first parameter group in a row storage format, where the first parameter group includes the at least one parameter identifying the data source that generates the time series data; and storing a second parameter group in a columnar storage format, where the second parameter group includes the indicator indicating the at least one attribute of the data source and the timestamp. In the method, the time series data is injected in a hybrid row-column storage manner.

Abstract: A method and an apparatus for accessing a critical resource, a computer device, and a readable storage medium are provided, to help reduce a quantity of operations for contending for a lock by a thread, and computing resources, and improve performance of an ARM processor. The method for accessing a critical resource includes: selecting a first thread from the first thread and a second thread to contend for a target lock (201), where a first task to be executed by the first thread and a second task to be executed by the second thread correspond to the target lock; and if the first thread obtains the target lock through contention, enabling the first thread to execute the first task, and replace the second thread to execute the second task (202).

Abstract: A fusion query method and a multi-model database (MMDB) framework are provided, to add a capability of extending a foreign engine in a relational database engine and manage metadata of the foreign extensible engine by using a user table. This minimizes intrusion to the relational database engine, and implements dynamic loading and unloading of the foreign engine during runtime. Therefore, a maintenance interface and uniform data access to a multi-model database such as a relational database, a graph database, or a time series database are provided for a user, so that learning and use costs of operation and maintenance personnel and application development personnel are reduced, and security of data use is improved.

Abstract: Embodiments of the present invention disclose a data index query method including: after performing Gray encoding on an index attribute, shuffling and encoding, by a server side, a Gray code corresponding to the index attribute to generate at least one index key value and storing the index key value; generating, by the server side according to query condition information carried in a query request, an index key value set or interval corresponding to the query condition information; obtaining an indicator set or interval used for indicating data and corresponding to the index key value set or interval according to the index key value set or interval; generating an intermediate data set corresponding to the indicator set or interval; and finally obtaining, from the intermediate data set, a target data set corresponding to the query condition information according to the query condition information carried in the query request.