Patent application number | Description | Published |
20080208923 | Method for verifying data consistency of backup system, program and storage medium - A technology for verifying backup data capable of synchronizing timings of checksum calculation and verifying data consistency regardless of the storing position of the data is provided. In a backup system using a data update log, a checksum of data of a backup source and a checksum of backup data are checked, thereby verifying data consistency. Data check log generation means and the like are provided so that the data update log and the data check log are transmitted in order to a secondary site. By this means, the timings of the checksum calculation are synchronized. Further, by providing data area extraction means and the like, the verification of data consistency can be performed regardless of the storing position of the data. | 08-28-2008 |
20080222214 | STORAGE SYSTEM AND REMOTE COPY SYSTEM RESTORING DATA USING JOURNAL - This invention provides a storage system including: a control unit; a first storage device for storing data; and a second storage device for storing journals of the data stored in the first storage device, in which: the first storage device has a RAID configuration for recording parity data dispersedly in a plurality of physical storage devices; and the control unit is configured to: create updated parity data based on updated data included in an update instruction; store the updated data and the updated parity data in the first storage device; record a journal including the updated data and the updated parity data in the second storage device; and read sequentially at least one of the journals upon reception of an instruction to restore the data stored in the first storage device to write the updated data and the updated parity data contained in the read journals in the first storage device. | 09-11-2008 |
20080229140 | System and method of disaster recovery - In a DR system, from the viewpoint of device cost, when search is not carried out, a physical application where log recovery is available by inexpensive DB appliance server is adopted. Further, a local mirror operation at a secondary site is not carried out. Furthermore, from the viewpoint of operation, by a log apply function unit, the tendencies of a log application and operations are monitored, and a search process is accepted according to the progress conditions of the log application. When the log application does not catch up sufficiently, the search is not accepted. Moreover, when a consistency guarantee of a secondary DB is made, not transactions in process at the moment of search instruction are undone (rolled back), but only transactions in process at the moment of a search instruction are redone (rolled forward). | 09-18-2008 |
20080256146 | Query processing method for stream data processing systems - A stream data processing system capable of highly reliable and highly usable real time data processing, is provided with: (1) a mechanism of copying some or all of stream data, and archiving the stream data in a non-volatile memory to allow real time data and archive data to be used seamlessly; and (2) a mechanism of improving the performance of query processings by using a plurality of stream data processing systems cooperatively. | 10-16-2008 |
20080288497 | Exclusive control method for database and program - A technology capable of preventing a problem which occurs when log writing of a preceding transaction fails while reducing waiting time of a subsequent transaction is provided. A database control method for releasing locking of data held by a transaction upon reception of a transaction completion instruction from an operation terminal or the like by a database is provided. The database includes an exclusive control module, a log output module, and a log buffer. The log output module stores a transaction completion log in the log buffer upon reception of the transaction completion instruction from the operation terminal. The exclusive control module releases locking held by the transaction upon reception of storage of the transaction completion log in the log buffer. | 11-20-2008 |
20090024810 | Memory area management method - In a storage device, a method is provided for preventing the risk of data loss and a significant decrease of writing speed due to area shrinkage when erased erase blocks have become fewer. A process of allocating a new page includes determining whether the length of a deallocated pages list is longer than n pages. If the list length is longer, one page is allocated from the deallocated pages list. If the list length is shorter, a capacity shortage error returns. Deleting a file using an erased pages list includes determining whether a page to be processed is emptied by deleting the file. If not so, the file is deleted from the page. If so, the contents of the last page-a in occupied pages are copied to the page, the page-a is written with data for erasure, and any erase block included in the page-a is made erasable. | 01-22-2009 |
20090248755 | SYSTEM AND METHOD FOR DATA BACKUP USING LOG RECORDS - To generate backup data based on a log while a power consumption of a standby system is reduced, provided is a method for data backup in which a first computer system transmits a data update record, a second storage system of a second computer system receives and then stores the data update record, and a second computer of the second computer system generates a copy of data contained in the first computer system based on the stored data update record, the method for data backup, including: monitoring the data update record transmitted by the first computer system, and stopping, when a predetermined first condition is satisfied, the second computer; and starting, when a predetermined second condition is satisfied, the second computer, thereby generating the copy of the data contained in the first computer system based on the stored data update record. | 10-01-2009 |
20100211577 | DATABASE PROCESSING SYSTEM AND METHOD - Provided is a database system in which sorting of query results is sped up. The database system stores storage location information in which storage locations of the pieces of data are recorded in a given order. When there is no second task, which is executed based on data that is fetched in a first task, whether every piece of data requested in a third task, which is executed before the first task, has been fetched is determined. In the case where every piece of data requested in the third task has been fetched, data fetched in the first task is output. In the case where some of the data requested in the third task has not been fetched, data fetched in the first task is kept in a temporary buffer until every piece of data requested in the third task is fetched, and then output. | 08-19-2010 |
20100293156 | DATABASE PROCESSING METHOD AND DATABASE PROCESSING SYSTEM - Provided is a database processing system including: a computer for outputting data in response to a received query request; and a storage system including a storage device for storing the data, in which: the storage device stores a plurality of partial indices indicating a storage location of the data; the data stored in the storage device is grouped; and the computer is configured to: receive the query request for the data; acquire one of the plurality of partial indices; specify, based on the query request for the data and the acquired one of the plurality of partial indices, a location at which the requested data is stored; and send a request to acquire the data stored at the specified location to the storage system. Accordingly, in the database processing system, a time period necessary to input and output the data is shortened. | 11-18-2010 |
20110029554 | METHOD AND COMPUTING SYSTEM FOR DISTRIBUTED STREAM DATA PROCESSING USING PLURAL OF COMPUTERS - In executing query distributed processing in a computer system having a plurality of computers, a query and a sliding window are inherited between different computers. If a tuple having a new principal key value is detected when a query is to be executed, a relevant individual query and a relevant sliding window are inherited between computers, and further a sliding window of a relevant common query is inherited between computers. | 02-03-2011 |
20110040827 | STREAM DATA PROCESSING METHOD AND APPARATUS - A user specifies a group by a user-defined query. An input order is assured among data of a same group. By outputting data belonging to a same group from the same node, an order inputted for a necessary portion is assured. By outputting data belonging to different groups from another node, processing in plural nodes is achieved to avoid reduction in performance. | 02-17-2011 |
20120151138 | DATA ARRANGEMENT METHOD AND DATA MANAGEMENT SYSTEM - According to this invention, a data arrangement method, the computer connected to a storage system which provides a plurality of logical storage devices comprising a plurality of physical storage devices arranges data in a logical storage volume constructed by integrating the plurality of logical storage devices. The method includes: a step wherein the computer receives an instruction to build the logical storage volume using the plurality of logical storage devices or to rebuild the constructed logical storage volume; a step wherein the computer obtains information about the plurality of physical storage devices constituting each of the plurality of logical storage devices included in the received instruction; and a step wherein the arrangement position of data into the logical storage volume is determined on the basis of the obtained information about the plurality of physical storage devices. | 06-14-2012 |
20120330931 | DATABASE MANAGEMENT METHOD, COMPUTER, SENSOR NETWORK SYSTEM AND DATABASE SEARCH PROGRAM - In a system manages a plurality of pieces of sensor information in a plant, or the like, it can be reducing an amount of data stored in a database and easily a processing for searching a place of an anomaly and an anomaly cause. | 12-27-2012 |