A database system is provided with a search unit for searching image attribute information that has been stored in a relational database management system. A search interface is provided between the search unit and a command execution unit, which applies a search command to the search unit. The command execution unit and search unit can be connected in detachable fashion. Thus a search unit that has been connected to the command execution unit can be replaced by detaching it and connecting a sea...

A method is provided of accessing a database comprising a plurality of entries, each entry comprising a main entry containing a headword. At least one of the entries comprises a first subsidiary entry (2) containing a plurality of sets of words, each of which is capable of being associated with the headword. The method comprises the steps of: entering a section of text which comprises a plurality of words; locating the entry whose main entry contains the headword corresponding to a selected word...

A computer-based method and system of processing records read respectively from first and second related tables of a database includes determining whether data contained in the records read from the first or second tables is unevenly distributed. Records corresponding to evenly distributed data are searched for matches using a first set of instances of the hash-join operator, and records corresponding to data which is unevenly distributed are searched for matches using a second set of instances ...

An application, such as an online merchant system, provides a name for a query stored in a database. The database accesses the query using the name provided by the application. The database next executes the query to produce an access object having the query results. The application then processes the access object to obtain a selected result. Storing queries in the database provides a level of indirection and flexibility enabling applications to access databases without prior knowledge of their...

One of a series of hardware/firmware primitives is disclosed for converting a general purpose digital computer into a database machine. The invention comprises a hardware/firmware implemented machine instruction called the find owner instruction, which fetches a set descriptor, which along with a base register BR, allows access to the owner pointer of a member record. The address of the owner record is then loaded into a register or registers.

A method and apparatus for publishing and receiving events to a network. A plurality of "publisher" entities publish information and a plurality of "subscriber" entities request and use the information. Publishers and subscribers are connected to each other through a network. The network is a "store and forward" network whose routing is "content-based." The basic quanta of information is called an "event." Publishers publish events and subscribers subscribe to events that match criteria defined ...

One of a series of hardware/firmware primitives is disclosed for converting a general purpose digital computer into a database machine. The invention comprises a hardware/firmware implemented machine instruction which sequentially checks each database record in a database area beginning at the page/line number address (database address) contained in a register, until the next active record is located. The database address of that active record is then loaded into a register.

A database system facilitates quick failover. The database system includes a primary node, a standby node and a fast interconnect between the primary node and the standby node. The primary node includes a primary buffer pool which stores pages of the database information, and a log storage which receives a log of updates for the pages within the primary buffer pool. When a page is to be updated by a primary node, the primary node sends a copy of a before update image of the page to the standby n...

The invention relates to a database system comprising a computing unit, a main memory and a, in particular a peripheral memory storing at least one multi-dimensional stock of data in the form of a UB tree, further the invention relates to methods to run a database of this kind to read data and to implement join operations and further relational algebra operations, and sub-dividing the UB tree into a predetermined number of sub-spaces and consecutively processing the sub-spaces to read and ready ...

A target database is synchronized with a source database in a database replication system. Key ranges of blocks of data to be replicated are used in the replication process. Also, synchronization occurs simultaneously with replication.