Abstract: Disclosed herein are system, method, and computer program product embodiments for performing fair prefetching. An embodiment operates by splitting a data vector into a first subrange and a second subrange. The embodiment performs a first chance prefetch operation on the first subrange based on a fixed number of pages, thereby loading a set of pages of the first subrange into a main memory. The embodiment performs the first chance prefetch operation on the second subrange based on the fixed number of pages, thereby loading a first set of pages of the second subrange into the main memory. The embodiment performs a second chance prefetch operation on the second subrange based on the performing the first chance prefetch operation on the second subrange, thereby loading a second set of pages of the second subrange into the main memory. The embodiment then executes the query.

Abstract: System, method, and various embodiments for providing a data access and recommendation system are described herein. An embodiment operates by identifying a column access of one or more data values of a first column of a plurality of columns of a table of a database during a sampling period. A count of how many of the one or more data values are accessed during the column access are recorded. A first counter is incremented by the count. The sampling period is determined to have expired. A load recommendation on how to load data values into the first column based on the first counter is computed. The load recommendation for implementation into the database for one or more subsequent column accesses is provided.

Abstract: System, method, and various embodiments for providing a data access and recommendation system are described herein. An embodiment operates by identifying a column access of one or more data values of a first column of a plurality of columns of a table of a database during a sampling period. A count of how many of the one or more data values are accessed during the column access are recorded. A first counter, corresponding to the first column and stored in a distributed hash table, is incremented by the count. The sampling period is determined to have expired. A load recommendation on how to load data values into the first column based on the first counter is computed. The load recommendation for implementation into the database for one or more subsequent column accesses is provided.

Abstract: Disclosed herein are systems, methods, and devices for providing load unit recommendations. An example method includes monitoring queries executed by a database management system including a database object, determining an access frequency of the database object based upon the monitoring, and determining relative access counter information for the database object based on the access frequency. Subsequently, the method includes generating a sorted element based on the relative access counter information, determining threshold values based on threshold information and the sorted element, and determining a load unit for the database object based on the sorted element and the threshold values. The load unit indicates whether to load the whole database object, or only a portion thereof, into a main memory of the DBMS while accessing the database object.

Abstract: Disclosed herein are system, method, and computer program product embodiments for performing fair prefetching. An embodiment operates by splitting a data vector into a first subrange and a second subrange. The embodiment performs a first chance prefetch operation on the first subrange based on a fixed number of pages, thereby loading a set of pages of the first subrange into a main memory. The embodiment performs the first chance prefetch operation on the second subrange based on the fixed number of pages, thereby loading a first set of pages of the second subrange into the main memory. The embodiment performs a second chance prefetch operation on the second subrange based on the performing the first chance prefetch operation on the second subrange, thereby loading a second set of pages of the second subrange into the main memory. The embodiment then executes the query.

Abstract: System, method, and various embodiments for providing a data access and recommendation system are described herein. An embodiment operates by identifying a column access of one or more data values of a first column of a plurality of columns of a table of a database during a sampling period. A count of how many of the one or more data values are accessed during the column access are recorded. A first counter, corresponding to the first column and stored in a distributed hash table, is incremented by the count. The sampling period is determined to have expired. A load recommendation on how to load data values into the first column based on the first counter is computed. The load recommendation for implementation into the database for one or more subsequent column accesses is provided.

Abstract: Disclosed herein are system, method, and device embodiments for providing load unit recommendations. An embodiment operates by monitoring queries executed by a database management system including a database object, determining an access frequency of the database object based upon the monitoring, and determining relative access counter information for the database object based on the access frequency. Some embodiments may further operate by generating a sorted element based on the relative access counter information, determining threshold values based on threshold information and the sorted element, and determining a load unit for the database object based on the sorted element and the threshold values, wherein the load unit may indicate whether to load the whole database object into main memory of the DBMS while accessing the database object or only load a portion of the database object into main memory of the DBMS when accessing the database object.

Abstract: The disclosure discloses a system and method for Message Passing Interface (MPI) implementation in an embedded operating system, applicable to a communication system including an application layer, an MPI layer, and an operating system layer, where an MPI application at the application layer is an application allocated to one or more MPI nodes; the Mil layer includes a process handling module, an underlying function library, and an MPI Application Programming Interface (API) to be invoked by the MPI application; and the process handling module receives a command of a user to invoke the MPI application, starts the application in response to the command, and invokes a service function of the embedded real-time operating system at the operating system layer through the underlying function library to control the one or more MPI node to execute and finish sub-tasks corresponding to the MPI application on the respective nodes.

Abstract: The present invention provides a chemical heat pump with a multi-channel membrane reactor, comprising: a feeding pipe, a liquid phase pump, a first solenoid valve, a multi-channel waste heat recovering membrane reactor, a discharging pipe, a remainder reflowing pipe, a heat regenerator, a second solenoid valve, a high-temperature heat release reactor, and a third solenoid valve.

Abstract: The disclosure discloses a system and method for Message Passing Interface (MPI) implementation in an embedded operating system, applicable to a communication system including an application layer, an MPI layer, and an operating system layer, where an MPI application at the application layer is an application allocated to one or more MPI nodes; the Mil layer includes a process handling module, an underlying function library, and an MPI Application Programming Interface (API) to be invoked by the MPI application; and the process handling module receives a command of a user to invoke the MPI application, starts the application in response to the command, and invokes a service function of the embedded real-time operating system at the operating system layer through the underlying function library to control the one or more MPI node to execute and finish sub-tasks corresponding to the MPI application on the respective nodes.

Abstract: The present invention provides a chemical heat pump with a multi-channel membrane reactor, comprising: a feeding pipe, a liquid phase pump, a first solenoid valve, a multi-channel waste heat recovering membrane reactor, a discharging pipe, a remainder reflowing pipe, a heat regenerator, a second solenoid valve, a high-temperature heat release reactor, and a third solenoid valve.

Abstract: A refrigeration system and a heat exchanger are provided. The refrigeration system includes a compressor, a micro-channel condenser, a micro-channel evaporator and at least one throttling device which are connected by pipelines. Each of the micro-channel condenser and the micro-channel evaporator includes an inlet manifold and an outlet manifold, and a plurality of flat tubes being connected between the inlet manifold and the outlet manifold. The inlet manifold of the micro-channel evaporator is provided with a baffle, and the inlet manifold of the micro-channel evaporator is divided by the baffle into multiple manifold sections, and the manifold sections of the inlet manifold are isolated from each other by the baffle, and are each in communication with a certain number of the flat tubes, and are each not provided with a distribution pipe configured to distribute flow rate into the flat tubes in communication with the manifold sections.

Abstract: A hydrogel capable of desalinating seawater and a preparation method thereof. The hydrogel is a polymer polymerized by a monomer containing a hydrophilic group and a carbon-carbon double bond via carbon-carbon double bonds. A degree of crosslinking of the polymer is 0.01 to 0.2. The monomer accounts for 5 wt % to 50 wt % of a mass of the hydrogel. The preparation method includes: mixing a monomer with a pore-forming agent, a cross-linking agent, a initiator and a catalyst evenly, obtaining a mixed material, then transferring the mixed material into a die; conducting a polymerization for 2 to 3 hours at a temperature of 20° C. to 30° C. first, followed by increasing the temperature to continue the polymerization until the polymerization is completed; and obtaining the hydrogel capable of desalinating seawater. The method according is convenient and efficient, and has advantages of being used under special conditions such as earthquake relief work, maritime rescue and wild adventure.

Abstract: A clothes dryer and a control method thereof are provided. The clothes dryer includes an air circulation system and a refrigerant circulation system, the refrigerant circulation system includes a compressor, a condenser, a throttling element and an evaporator; the air circulation system includes a filter device, an air circulation power fan and a roller, and the refrigerant circulation system does not include a subcooler; the clothes dryer further includes a controller, a temperature sensor or a temperature-sensing element, and a temperature and humidity sensing element; the controller is configured to control an operation of the refrigerant circulation system, the operation of the clothes dryer includes a temperature rise phase and a basic drying phase, and the compressor of the clothes dryer is configured to have a higher power consumption in the temperature rise phase than in the basic drying phase, to rapidly rise a temperature in the clothes dryer.

Abstract: A refrigeration system and a heat exchanger are provided. The refrigeration system includes a compressor, a micro-channel condenser, a micro-channel evaporator and at least one throttling device which are connected by pipelines. Each of the micro-channel condenser and the micro-channel evaporator includes an inlet manifold and an outlet manifold, and a plurality of flat tubes being connected between the inlet manifold and the outlet manifold. The inlet manifold of the micro-channel evaporator is provided with a baffle, and the inlet manifold of the micro-channel evaporator is divided by the baffle into multiple manifold sections, and the manifold sections of the inlet manifold are isolated from each other by the baffle, and are each in communication with a certain number of the flat tubes, and are each not provided with a distribution pipe configured to distribute flow rate into the flat tubes in communication with the manifold sections.

Abstract: Systems and methods for non-disruptive cache startup, shutdown, data partition movement, and node rebalancing for a data fabric within a data grid in a database environment. The data grid is a clustered in-memory database (IMDB) cache comprising one or more data fabrics including multiple IMDB cache nodes. The method takes a time tag and moves data from source to destination nodes while allowing updates to data on the source nodes. The method propagates updates occurring after the time tag to destination nodes from source nodes and switches applications and ownership to the destination nodes. Another method slices data for a partitioned fabric and stores slices on nodes. Another method starts a data fabric by moving data from a grid backend to the nodes. In an embodiment, another method rebalances nodes in a non-disruptive manner. When a fabric is shutdown, the method saves data from the nodes to the grid backend.

Abstract: A clothes dryer and a control method thereof are provided. The clothes dryer includes an air circulation system and a refrigerant circulation system, the refrigerant circulation system includes a compressor, a condenser, a throttling element and an evaporator; the air circulation system includes a filter device, an air circulation power fan and a roller, and the refrigerant circulation system does not include a subcooler; the clothes dryer further includes a controller, a temperature sensor or a temperature-sensing element, and a temperature and humidity sensing element; the controller is configured to control an operation of the refrigerant circulation system, the operation of the clothes dryer includes a temperature rise phase and a basic drying phase, and the compressor of the clothes dryer is configured to have a higher power consumption in the temperature rise phase than in the basic drying phase, to rapidly rise a temperature in the clothes dryer.

Abstract: Methods, systems, and computer program products are provided to manage a database system. The method includes locking during a database system idle time access by the database system to a data page of a data allocation unit, compressing during the database system idle time a data stored in the locked data page, and recording during the database system idle time an indication that the compressed and locked data page includes free storage space, wherein unlocked data pages of the data allocation unit are accessible by the database system during the compressing of the data stored in the locked data page. Thus, the data page may be compressed during idle time and the space freed therein may be used during a subsequent run time without the need for a reorganization of the data pages within the corresponding table (as in, for example, operation of a reorg+rebuild SQL command combination).

Abstract: System, method, computer program product embodiments and combinations and sub-combinations thereof for managing data storage as an in-memory database in a database management system (DBMS) are provided. In an embodiment, a specialized database type is provided as a parameter of a native DBMS command. A database hosted entirely in-memory of the DBMS is formed when the specialized database type is specified.

Abstract: Methods, systems, and computer program products are provided to manage a database system. The method includes locking during a database system idle time access by the database system to a data page of a data allocation unit, compressing during the database system idle time a data stored in the locked data page, and recording during the database system idle time an indication that the compressed and locked data page includes free storage space, wherein unlocked data pages of the data allocation unit are accessible by the database system during the compressing of the data stored in the locked data page. Thus, the data page may be compressed during idle time and the space freed therein may be used during a subsequent run time without the need for a reorganization of the data pages within the corresponding table (as in, for example, operation of a reorg+rebuild SQL command combination).