Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A distributed database management system, comprising: a plurality of computers (1a, 1b, 1c), each including a database (14) for storing data to be processed, the plurality of computers being interconnected by communication lines (2), each computer including: input means (18) for inputting a data name corresponding to specific data to be processed, the specific data being stored in at least one of the databases; and memory management means (22) for storing a plurality of predetermined data names and a corresponding address area and location information for each data name; characterised by: retrieval time measurement means (24) for measuring a data retrieval time corresponding to the time necessary to retrieve the specific data corresponding to the input data name from one of the databases; retrieval time memory means (26) for storing the data retrieval time measured by the retrieval time measurement means in association with a corresponding address area where the specific data is stored; and selection means (28, 30) for retrieving the specific data to be processed corresponding to the input data name, when the same data is stored in at least two of the databases, from one of the databases containing an address area which is associated with one of the data retrieval times stored in the retrieval time memory means corresponding to the same data name.
Claim 2
Dependent Claim
49 words
The distributed database management system of claim 1, wherein the selection means includes retrieval optimization means (30) for selecting the location information corresponding to the address area associated with the shortest data retrieval time among the data retrieval times associated with address areas corresponding to the input data name.
Claim 3
Dependent Claim
39 words
The distributed database management system of claim 1, wherein the retrieval time measurement means (24) includes means for updating the data retrieval time corresponding to the address area based on the data retrieval time retrieved by the selecting means.
Claim 4
Dependent Claim
198 words
A distributed database management system, comprising: a plurality of computers (1a, 1b, 1c), each including a database (14) for storing data to be processed, the plurality of computers being interconnected by communication lines (2), each computer including: memory management means (22) for storing data names corresponding to the stored data and corresponding address areas and location information for all databases in the system; characterised by: input means (18) for inputting of data to be registered and a desired retrieval time by a user; retrieval time measurement means (24) for measuring data retrieval times corresponding to the time necessary to retrieve data from each database; retrieval time memory means (26) for storing the data retrieval times measured by the retrieval time measurement means in association with the address area of the corresponding data; retrieval time prediction means (28) for locating an address area corresponding to the desired retrieval time in the retrieval time memory means which does not contain stored data; and data retrieval optimization means (30) for selecting the location information in the memory management means corresponding to the address area located by the retrieval time prediction means, and storing the input data in the located address area.
Claim 5
Dependent Claim
61 words
The distributed database management system of claim 4, wherein the retrieval time prediction means (28) includes means for extracting the data retrieval time associated with an address area stored in the memory management means which does not contain stored data when the desired retrieval time does not coincide with any of the data retrieval times in the retrieval time memory means.
Claim 6
Dependent Claim
42 words
The distributed database management system of claim 5, further including output means (20) for outputting the data retrieval time extracted by the retrieval time prediction means, to allow the user to select the outputted data retrieval time as a desired retrieval time.
Claim 7
Dependent Claim
59 words
The distributed database management system of claim 4, wherein the data retrieval optimization means (30) includes means for storing in the memory management means a data name corresponding to the input data in association with the located address area where the input data was stored and corresponding location information, after the input data has been stored in the database.