Abstract: A magnetic resonance imaging (MRI) system and method integrating multi-nuclide synchronous imaging and spectral imaging is provided. The MRI system includes a spectral imaging module, a multi-nuclide synchronous imaging module, and a spectral reconstruction and image fusion module, where the spectral imaging module is configured to acquire a spectrum of a nuclide Nuc; the multi-nuclide synchronous imaging module is configured to perform synchronous imaging of nuclides Nuc1 . . . Nucn, where when n=1, Nucl is 1H; and when n>1, Nucn is a non-1H nuclide; and the spectral reconstruction and image fusion module is configured to receive the spectrum of the nuclide Nuc and images of the nuclides Nuc1 . . . Nucn, and acquire spatial distribution information of compounds of the nuclide Nuc and spatial distribution information of the non-1H nuclide through fusion. The system and method can synchronously acquire MR signals of different nuclides, and reconstruct and fuse non-1H nuclide images.

Abstract: A magnetic resonance imaging (MRI) system and method integrating multi-nuclide synchronous imaging and spectral imaging is provided. The MRI system includes a spectral imaging module, a multi-nuclide synchronous imaging module, and a spectral reconstruction and image fusion module, where the spectral imaging module is configured to acquire a spectrum of a nuclide Nuc; the multi-nuclide synchronous imaging module is configured to perform synchronous imaging of nuclides Nuc1 . . . . Nucn, where when n=1, Nucl is 1H; and when n>1, Nucn is a non-1H nuclide; and the spectral reconstruction and image fusion module is configured to receive the spectrum of the nuclide Nuc and images of the nuclides Nuc1 . . . . Nucn, and acquire spatial distribution information of compounds of the nuclide Nuc and spatial distribution information of the non-1H nuclide through fusion. The system and method can synchronously acquire MR signals of different nuclides, and reconstruct and fuse non-1H nuclide images.

Abstract: Methods, processing units, and computer-readable media in a cloud-based database are described. Redo log records are applied to a page at a database replica only when an updated version of the page is requested at the database replica. A log cache may be used by a replica node of the database to track recent redo log records applicable to a given page. The recent redo log records stored in the log cache may be applied to update the page on-demand when an updated version of the page is requested. By applying only the redo log records applicable to pages that are currently being requested, processing resources may be used only to generate pages that are currently required. Methods for registering redo log records into the log cache by the master or replica server are also described.

Abstract: Methods, processing units, and computer-readable media in a cloud-based database are described. Redo log records are applied to a page at a database replica only when an updated version of the page is requested at the database replica. A log cache may be used by a replica node of the database to track recent redo log records applicable to a given page. The recent redo log records stored in the log cache may be applied to update the page on-demand when an updated version of the page is requested. By applying only the redo log records applicable to pages that are currently being requested, processing resources may be used only to generate pages that are currently required. Methods for registering redo log records into the log cache by the master or replica server are also described.

Abstract: A system and method are disclosed for utilizing compression in database caches to facilitate access to database information. In contrast with applying compression to the database that is stored on disk, the present invention achieves performance advantages by using compression within the main memory database cache used by a database management system to manage data transfers to and from a physical database file stored on a storage system or stored on a networked attached device or node. The disclosed system and method thereby provide a significant technical advantage by increasing the effective database cache size. And this effective increase in database cache size can greatly enhance the operations-per-second capability of a database management system by reducing unnecessary disk or network accesses thereby reducing data access times.

Abstract: The present invention provides functional client side data cache coherence distributed across database servers and clients. This system includes an application resident on a client operable to request access to data, and wherein the client is coupled to a local memory cache operable to store requested date. The client is coupled to a remote memory storage system, such as disk storage or network resources by a communication pathway. This remote memory storage system is operable to store data, process requests for specified data, retrieve the specified data from within the remote memory storage system, and transmit the requested data to the client with annotated version information. The data received by the client is verified as being coherent with any downstream linked information stored in the client's local memory cache. Otherwise, updated coherent data is requested, received and verified prior to being used by the client and its resident applications.

Abstract: A system and method are disclosed for improving the efficiency of write operations by intelligently managing disk pages that are written during checkpoint operations so that write operations can occur with reduced numbers of writes. As write data is received and cached, for example, by a database application, disk pages are allocated to the write data. When a checkpoint operation is taken to write the data cache to disk as modifications or additions to the database file, an intelligent write management module re-assesses the disk page allocation and re-maps disk writes to improve the efficiency of disk input/output (I/O) operations. As such, significant improvements in the speed and efficiency of database operations during checkpoint events are achieved.

Abstract: A system and method are disclosed for utilizing compression in database caches to facilitate access to database information. In contrast with applying compression to the database that is stored on disk, the present invention achieves performance advantages by using compression within the main memory database cache used by a database management system to manage data transfers to and from a physical database file stored on a storage system or stored on a networked attached device or node. The disclosed system and method thereby provide a significant technical advantage by increasing the effective database cache size. And this effective increase in database cache size can greatly enhance the operations-per-second capability of a database management system by reducing unnecessary disk or network accesses thereby reducing data access times.

Abstract: A system and method are disclosed for improving the efficiency of write operations by intelligently managing disk pages that are written during checkpoint operations so that write operations can occur with reduced numbers of writes. As write data is received and cached, for example, by a database application, disk pages are allocated to the write data. When a checkpoint operation is taken to write the data cache to disk as modifications or additions to the database file, an intelligent write management module re-assesses the disk page allocation and re-maps disk writes to improve the efficiency of disk input/output (I/O) operations. As such, significant improvements in the speed and efficiency of database operations during checkpoint events are achieved.

Abstract: The present invention provides functional client side data cache coherence distributed across database servers and clients. This system includes an application resident on a client operable to request access to data, and wherein the client is coupled to a local memory cache operable to store requested date. The client is coupled to a remote memory storage system, such as disk storage or network resources by a communication pathway. This remote memory storage system is operable to store data, process requests for specified data, retrieve the specified data from within the remote memory storage system, and transmit the requested data to the client with annotated version information. The data received by the client is verified as being coherent with any downstream linked information stored in the client's local memory cache. Otherwise, updated coherent data is requested, received and verified prior to being used by the client and its resident applications.