Abstract:
Exemplary embodiments provide a database query processing system comprising a hybrid buffer pool stored in a computer main memory coupled to a processor, the hybrid buffer pool comprising: a shared buffer pool of page frames that contain dirty data pages that are modified and will be written back to storage; and an immutable buffer pool that temporarily contains read-only data pages from the storage, wherein the shared buffer pool is different from the immutable buffer pool. A page multiplexer that identifies which ones of the data pages from storage to store in the immutable buffer pool based at least in part on information from a query processor.
Abstract:
A case for an electronic device includes a fastening part attachable and detachable to and from at least part of the electronic device, a cover that covers a first surface of the electronic device that faces a first direction, with the cover in a closed state, and a connecting part that connects the fastening part and the cover. The cover includes a base plate and a soft material part disposed in a second direction from the base plate, with the cover in the closed state, the second direction being opposite to the first direction, wherein at least a portion of the soft material part makes contact with the first surface of the electronic device.
Abstract:
Exemplary embodiments provide a hybrid buffer pool for a database that includes a plurality of data pages contained in storage. The hybrid buffer pool comprises: a shared buffer pool of page frames containing dirty data pages that are modified after reading that will be written back to storage; an immutable buffer pool that temporarily contains read-only data pages from the storage; and a page multiplexer that identifies which ones of the data pages from storage to store in the immutable buffer pool based at least in part on information from a query processor.
Abstract:
A cleaning device includes an improved structure in which cleaning performance can be improved. The cleaning device includes an inhalation unit to generate inhalation force to inhale air into a main body, wherein the inhalation unit includes: an impeller that is rotatable; an impeller cover having an inlet damper formed therein; and a return channel coupled to the impeller cover so that the impeller can be accommodated in the return channel, wherein the return channel includes: an inner frame; and an outer frame placed at an outer side of the inner frame so as to be spaced apart from the inner frame, and a plurality of wings are disposed between the inner frame and the outer frame.
Abstract:
Exemplary embodiments provide a hybrid buffer pool for a database that includes a plurality of data pages contained in storage. The hybrid buffer pool comprises: a shared buffer pool of page frames containing dirty data pages that are modified after reading that will be written back to storage; an immutable buffer pool that temporarily contains read-only data pages from the storage; and a page multiplexer that identifies which ones of the data pages from storage to store in the immutable buffer pool based at least in part on information from a query processor.
Abstract:
Exemplary embodiments provide access to an updated file performed by at least one processor, wherein responsive to receiving a first list of logical block addresses (LBAs) and a second list of LBAs for an update, wherein the first list of LBAs is mapped to a first list of physical block addresses (PBAs), and the second list of LBAs is mapped to a second list of PBAs, the method, comprising: atomically remapping the first list of LBAs so that the first list of LBAs is mapped to the second list of PBAs; trimming a mapping of the first list of LBAs to the first list of PBAs; and unmapping the mapping of the second list of LBAs to the second list of PBAs.
Abstract:
Example embodiments provide access to an updated file performed by at least one processor, wherein responsive to receiving a first list of logical page numbers (LPNs) and a second list of LPNs for an update, wherein the first list of LPNs is mapped to a first list of physical page numbers (PPNs), and the second list of LPNs is mapped to a second list of PPNs, the method, comprising: atomically remapping the first list of LPNs so that the first list of LPNs is mapped to the second list of PPNs; and trimming a mapping of the first list of LPNs to the first list of PPNs.
Abstract:
A cleaning device includes an improved structure in which cleaning performance can be improved. The cleaning device includes an inhalation unit to generate inhalation force to inhale air into a main body, wherein the inhalation unit includes: an impeller that is rotatable; an impeller cover having an inlet damper formed therein; and a return channel coupled to the impeller cover so that the impeller can be accommodated in the return channel, wherein the return channel includes: an inner frame; and an outer frame placed at an outer side of the inner frame so as to be spaced apart from the inner frame, and a plurality of wings are disposed between the inner frame and the outer frame.
Abstract:
A cleaning device includes an inhalation unit to generate inhalation force to inhale air into a main body, the inhalation unit comprising: an impeller that is rotatable; an impeller cover having an inlet damper formed therein; and a return channel that is coupled to the impeller cover so that the impeller is capable of being accommodated in the return channel and that is directly coupled to the impeller so that air passing through the impeller is capable of being introduced into the return channel, the return channel comprising: an inner frame; and an outer frame at an outer side of the inner frame so as to be spaced apart from the inner frame.
Abstract:
Exemplary embodiments provide access to an updated file performed by a computer having at least one processor, wherein responsive to an application receiving an update comprising modified content of an old file, a new file is created into which the modified content is copied, while access to the old file is maintained, wherein old file logical block addresses (LBAs) are mapped to old file physical block addresses (PBAs), and new file LBAs are mapped to new file PBAs, the method, comprising: atomically swapping the mapping of the old file LBAs from the old file PBAs to the new file PBAs; trimming the mapping of the old file LBAs to the old file PBAs; and clearing the mapping of the new file LBAs to the new file PBAs.