Abstract: A large highly parallel database management system includes thousands of nodes storing huge volume of data. The database management system includes multiple query optimizers for determining low cost execution plans for queries. The database management system is adapted to receive a data query. An execution plan generator component of the database management system generates an initial execution plan for the query. The initial execution plan is fed as input to more than one query optimizers. Each optimizer starts with the initial execution plan, generates alternative execution plans, and determines a satisfactory execution plan that incurs the lowest cost. The database management system compares the selected execution plans by the optimizers and selects one with the lowest cost. The multiple query optimizers run in parallel.

Abstract: A user device is operable to determine a query request based on first user input to a graphical user interface displayed by the user device. Query cost data is determined based on the query request. A prompt is displayed via the graphical user interface that indicates the query cost data. Query approval data is determined based on second user input to the graphical user interface in response to the prompt. The query request is transmitted to an analytics system for execution against a database system when the query approval data indicates approval to transmit the query request.

Abstract: A computing system is operable to generate a first plurality of lines of coding blocks that includes a first plurality of data blocks and a first plurality of parity blocks. A first set of segments of a first segment group that collectively include the first plurality of lines of coding blocks are generated, and the first set of segments of the first segment group are stored via a first plurality of computing devices of a first storage cluster of the computing system. A second plurality of lines of coding blocks that includes a second plurality of data blocks and a second plurality of parity blocks are generated. A second set of segments of a second segment group that collectively include the second plurality of lines of coding blocks are generated. The second set of segments of the second segment group are stored via a second plurality of computing devices of a second storage cluster of the computing system.

Abstract: A node of a database system is operable to determine, at a first time, to prepare for a shutdown. The shutdown of the node is performed at a second time that is a period of time after the first time based on the node delaying the shutdown until a plurality of currently running processes being run by the node that initiated prior to the first time are determined to be complete. During the period of time after the first time and prior to performing the shutdown, a set of new processing requests are rejected by the node.

Abstract: A database system includes a plurality of computing devices. Each computing device includes a plurality of processing modules, a computing device operating system, and an application specific operating system. The computing device operating system includes a computing device operating system file system management instruction set. The application specific operating system includes at least one custom file system management instruction set operable to configure operation of a configurable set of processing modules of the plurality of processing modules based on generating a corresponding file system management configuration signal for each processing module of the configurable set of processing modules indicating a selected file system management instruction set of the computing device operating system or the application specific operating system.

Abstract: A node of a database system is operable to receive a plurality of data blocks from a set of source nodes via a set of relay nodes. At least one feedback data block to be sent to at least one of the set of source nodes is generated. Feedback relay node selection data selecting at least one of a plurality of nodes in the database system for facilitating routing of the at least one feedback data block from the node to the at least one of the set of source nodes via a prioritized feedback communication mechanism is generated. The at least one feedback data block is sent to the at least one of the plurality of nodes selected in the feedback relay node selection data. The at least one feedback data block is routed from the node to the at least one of the set of source nodes via the prioritized feedback communication mechanism.

Abstract: A query processing system is operable to determine a set of query rules that includes a minimum result set size rule. A query is received from a requesting entity. A size of a result set of the query is determined. Compliance data is determined based on determining whether the size of the result set complies with the minimum result set size rule. When the compliance data indicates the size of the result set complies with the minimum result set size rule, a query result for the query is generated based on the result set, and the query result is generated to the requesting entity. When the compliance data indicates the size of the result set does not comply with the minimum result set size rule: transmission of the query result to the requesting entity is foregone.

Abstract: A node of a computing system includes a main memory and a plurality of processing core resources. The main memory includes a computing device section and a database section. The computing device section includes a computing device operating system area and a computing device general area. The database section includes a database section that includes a database operating system area, a disk area, a network area, and a database general area. The database operating system area allocates at least one portion of the main memory for database operations that is locked from access by the computing device operating system area.

Abstract: A method includes obtaining a plurality of data partitions of a data set for storage in a database system. The method further includes determining a first data storage coding scheme for a first partition of the plurality of data partitions, where the first data storage coding scheme includes first encoding parameters regarding encoding the first partition into first data segments and first parity segments. The method further includes determining a second data storage coding scheme for a second partition of the plurality of data partitions. The method further includes dividing the first partition to produce a first number of first raw data segments, where the first number is based on the first data storage coding scheme. The method further includes dividing the second partition to produce a second number of second raw data segments, where the second number is based on the second data storage coding scheme.

Abstract: A computing device includes a computing device controller hub and a plurality of parallelized nodes coupled to the computing device controller hub. Each node of the plurality of parallelized nodes includes a central processing module, a main memory, and at least one disk memory. The plurality of computing devices is operable to collectively execute query requests against at least one database table stored by the plurality of computing devices based on each node of each computing device performing corresponding operations independently from other nodes of the plurality of parallelized nodes.

Abstract: The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of a liquid medium comprising the monomer(s) and ethane or carbon dioxide that is substantially dissolved therein.

Abstract: A turbofan engine having a thrust reverser having at least one movable control surface, movable to and from a reversing position where at least a portion of the bypass air flow is at least partially reversed, a thrust reverser actuation system having multiple actuators and a lockout mechanism movable between an inhibit condition, wherein movement of the multiple actuators is prevented, and a permit condition, wherein movement of the multiple actuators is permitted.

Abstract: Systems, methods, and non-transitory computer-readable media can generate at least one multi-author story using content items that satisfy one or more grouping criteria associated with the multi-author story, wherein the content items were previously published by users of a social networking system and provide access to the multi-author story to one or more users of the social networking system that satisfy one or more access restrictions associated with the multi-author story.

Abstract: A turbofan engine having a thrust reverser having at least one movable control surface, movable to and from a reversing position where at least a portion of the bypass air flow is at least partially reversed, a thrust reverser actuation system having multiple actuators and a lockout mechanism movable between an inhibit condition, wherein movement of the multiple actuators is prevented, and a permit condition, wherein movement of the multiple actuators is permitted.

Abstract: An integrated process for the solution polymerization and subsequent halogenation of butyl rubber in a common medium is disclosed. The process comprises providing a solution polymerization reactor containing a C6 medium mixed with a monomer mixture comprising at least an isoolefin monomer and a multiolefin monomer in a mass ratio of monomer mixture to medium of from 61:39 to 80:20. Once polymerized, residual unreacted monomer mixture is separated from the rubber solution using a distillation process. The residual monomers may then be purified and recycled back into the reactor. The separated rubber solution is then halogenated. The process obviates the need for separating the rubber from the medium following polymerization, then re-dissolving it in another solvent for halogenation, thereby saving energy cost. The process optionally employs heat exchangers for the reactor feed streams to further reduce energy consumption.

Abstract: A portable water purifier for purifying a liquid to a safe form acceptable for drinking may be provided. The portable water purifier may include a container configured to hold the liquid, a filtering mechanism connected to the container configured to filter out dirt or sediment floc from the liquid, and a transport mechanism in communication with the filtering mechanism configured to transport the liquid into the filtering mechanism. The portable water purifier may also include a mixer inside the container configured to disperse a chemical disinfectant or a flocculating agent tablet within a liquid, for instance water.