Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2000-07-17
2001-11-13
Shin, Christopher B. (Department: 2182)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C710S068000
Reexamination Certificate
active
06317747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
This invention relates to system management of data. More particularly, it relates to system control of compression and decompression of data based upon system aging parameters and demand such that compressed data becomes a system managed resource.
2. Background Art
In the interactive commercial business environment, data sets are often very large. One example of this is databases, which may be spread over several storage devices, such as direct access storage devices (DASD), on several DASD controllers and increasingly over several interconnected machines.
More efficient use may be made of storage attached to a computer if data can be compressed before it is stored. Multi-fold compression ratios can be achieved with algorithms currently available for some data set contents. Often, frequent access is limited to some subsets of these data sets, and further to certain subsets of the data set itself. Data sets of the size common on commercial business machines render full file based data compression such as ‘terse’ unacceptable for anything other than long-term archives. Furthermore occasional usage requires the entire dataset be decompressed at first access. The commercial business environment is highly interactive. To be of value, data must be made available on demand without manual intervention.
Also, in the IBM AS/400 System, compression is offered with all functions provided by software. Such software compression allows for the compression of objects with performance in the 70-80 thousand (K) byte range. There is a need in the art for hardware compression to enhance and extend compression to database, office, and spool files.
It is an object of the invention to provide a practical method to segment large files and perform efficient compression. It is a further object of the invention to apply compression more efficiently to large databases, portions of which may be used more frequently than others.
It is a further object of the invention to provide a system and method for managing data, with compressed data managed as a system resource based upon aging and demand.
SUMMARY OF THE INVENTION
A system for controlling modification of a data object includes a host processor, a main storage, a remote storage and a data modification input/output processor (IOP). Responsive selectively to an application request for a data object which has previously been modified, or to a system defined parameter, such as age of a data object since creation or modification, the host processor stores in said main storage a data object selectively from said remote storage via a bus transport mechanism (BTM). The BTM includes a modification operation command, a data out descriptor (DOD) for addressing the location in said main storage of the data object that needs to be modified, and a data in descriptor (DID) for addressing the location in said main storage where the resulting modified data object is to be stored. The modification IOP utilizes the BTM and executes the modification command to modify and return the data object to main storage.
In accordance with a further aspect of the invention, data object modification selectively is data object compression and data object decompression. In accordance with a further aspect of the invention, data objects may be divided into subcomponents and compressed or decompressed on a subcomponent basis.
Other features and advantages of this invention will become apparent from the following detailed description of the presently preferred embodiment of the invention, taken in conjunction with the accompanying drawings.
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Bolan Joseph Edward
Clark Brian Eldridge
Klouda Gregory Robert
Walk Bruce Marshall
Beckstrand Shelley M
International Business Machines - Corporation
Shin Christopher B.
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