JPH05204973A - Decentralized data base retrieving system - Google Patents

Abstract

PURPOSE:To retrieve a decentralized data base with accesses given to plural data base systems and without carrying out an operation for reconnection through a terminal when the data base, systems of the same kind are connected together via a network for construction of the decentralized data base. CONSTITUTION:A 1st communication control program 22 contained in a data base control processor 2 receives a request from an input/output control program 21 for connection of plural data base systems. Then the program 22 starts a communication control subprogram in response to each data base system and connects those data base systems together via a communication control program 11. Then the program 22 gives the retrieving request given from the program 21 to the communication control subprogram in accordance with the request contents and sends collectively the answers to the program 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed database search system, and more particularly to a distributed database search system for searching similar databases distributed in a wide area such as a library system via a circuit switching network.

[0002]

2. Description of the Related Art Conventionally, in this kind of distributed database search method, when searching, the database A is first connected to the database A, and the required information cannot be obtained. Disconnects from the database A and then connects to the database B to perform a search. If the required information cannot be obtained from the database B, the search from one terminal is performed only on one database like the database C, and the search is performed on a plurality of databases by changing the partner, that is, the databases. To do. There is also a method in which distributed databases are collected, a super-large centralized database is constructed, and all users search this. For example, this is a catalog location information service of the Academic Information Center, which can centrally manage the data of university libraries distributed in Japan and search the data of university libraries nationwide from each university.

[0003]

In the above-mentioned conventional distributed database search method, only one database is searched for, and another database is searched by connecting to the database that has been searched until now. Detach,
You will need to reconnect to the database you are searching for. In this case, if a few databases are searched, it does not require a great deal of effort for reconnection, but if there are many databases, if the connection order is wrong, specific information to be obtained can be found. However, there is a problem that it may take a lot of time.

Further, in the method of centrally managing the distributed database, there is a first problem of who registers in the database. In other words, based on a distributed database, in order to keep the contents of each database the same, the administrator of each database registers it in the database it manages and On the other hand, it is necessary to register the information, which may be troublesome twice. Secondly, because of the problem of how to manage the ever-increasing amount of information in a limited resource, it is necessary to manually determine when each piece of information becomes unnecessary and is deleted from the database. This means that when the amount of information is large, it becomes an extremely difficult task. Thirdly, when there are processing requests from a large number of terminals, all processing concentrates on centralized management data, so that no matter how large the database system is, a large number of processings are executed simultaneously. However, they are processed in order according to the priority order, time slice value, and the like. Therefore, there is a problem in that the user may wait for a long time or may not be able to connect to the data. In general, a centralized database has a problem that the larger the amount of data and the number of hits, the larger the load on the entire system and the opposite of the expected processing time.

[0005]

DISCLOSURE OF THE INVENTION A distributed database search system of the present invention is a distributed database search system in which a database system of the same type searches a distributed database connected to a circuit switched network. And a communication control processor for controlling connection with the circuit switching network by a communication control program and a search request from the input / output terminal means to a plurality of database systems connected to the circuit switching network, and inputting / outputting response contents. A first communication management program transmitted to the terminal means, and a plurality of managing the communication control program by instructing the communication control program to connect the respective database systems of the search requests to the plurality of database systems received by the first communication management program Communication management subprogram and the call received by the communication control program from the circuit switch. A second communications manager for initiating a session by, constructed by having a search program for searching a database through a session established by the second communications manager.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.
The embodiment of FIG. 1 shows one database system of a distributed database system connected via a circuit switching network, and has a communication control processor 1, a database control processor 2, a database 3, and an input / output terminal 4. There is. The communication control processor 1 is a communication control program 1
It is a processor dedicated to communication control that operates by 1. The database control processor 2 is the input / output control program 2
1, a first communication management program 22, a plurality of communication management subprograms 221, 222 to 22n, a second communication management program 23, and a search program 24.

With the above configuration, the communication control program 11 is a program for performing normal communication management, and the data requested by the communication management subprograms 221, 22n is sent to another database system via the circuit switching network. Each of the communication management subprograms 221 to 221 which is transmitting the information after the line connection such as the response from the other database system and the fault notification from the circuit switching network while being transmitted.
Return to 2n. In response to a search request from another database system, the second communication management program 23 is activated to connect and disconnect the actual session with the communication destination. The input / output control program 21 checks the search command and data input by the user from the input / output terminal 4 and passes it to the first communication management program 22 to set the position where the response data is displayed on the display screen of the input / output terminal 4. And output. It also controls the interrupt request from the input / output terminal 4. In response to a request from the input / output control program 21, the first communication management program 22 activates the communication management subprograms 221 to 22n of the number of other database systems to be searched, and communicates with the communication control program 11 via this subprogram. Exchange data. In addition, for an unrecoverable failure, the I / O control program 21 is notified, and a disconnection request for the failed session is sent to the communication management subprograms 221, to 22n.
To the input / output terminal 4.
The communication management sub-programs 221, ... Restore. The second communication management program 23,
Retrieval program 2 in response to a retrieval request from another database system input via communication control program 11
4 is activated to perform data transmission between the search program 24 and the communication control program 11. It also terminates the search program 24 when a search is requested and gives a processing instruction when a line failure occurs. The search program 24 is a program for actually searching the database 3, and sends back a response to the other requested database system.

2, FIG. 3, FIG. 4, and FIG. 5 are examples of the contents of the screen displayed on the input / output terminal 4 when the input / output terminal 4 is searched for another database in the embodiment of FIG. With reference to FIGS. 2 to 4, the description will proceed with reference to FIGS. When a search request is issued from the input / output terminal 4, the input / output control program 21 first causes the input / output terminal 4 to display a database selection screen which is an initial screen. FIG. 2 shows a case in which five libraries A, D, L, K, and E are selected by referring to the names of all university libraries of the system displayed on the initial screen. By pressing the execution key after selecting a library, the input / output control program 21 outputs a connection request to the five selected libraries in the communication management program 22. The communication management program 22 requests the communication management subprograms to connect to the five libraries, respectively. Each of the requested communication management subprograms independently connects to the second communication management program of the database system of each library via the communication control program 11. All connections to the other library can be made by the communication management subprogram, and the first communication management program 22
When the input / output control program 21 receives confirmation information from the input / output control program 21, the input / output control program 21 causes the input / output terminal 4 to display a hit number display screen. Therefore, when the user inputs all the materials related to management as the first to the search word input screen and instructs the search, this instruction is issued from the input / output control program 21 via the first communication management program 22 and the communication management subprogram. Given to each database system. When the search result returns in the reverse path, the input / output control program 21 displays the number of replies in the latest column of the hit count display screen. Fig. 3 shows the results of No. 1 moved to the previous column when the system of all materials related to management of No. 1 and No. 2 is input and executed as a search word on the hit count display screen. The result of is displayed in the latest column. Next, when the user selects No. 4 as the database name on the hit count display screen and requests a search, the input / output control program 21 is connected to the fourth university library via the first communication management program 21. Select the Communications Management subprogram to request this library's database system to display the contents of a system of all management material. FIG. 4 is a diagram showing an example of a search result display screen (outline) displayed by the input / output control program 21 that has been searched for by this request and has received a response. When a search request is made by selecting, a search result display screen (detailed display) as shown in FIG. 5 is displayed.

As described above, the input / output control program 21 holds the communication path until the end of the search for each of the other database systems specified in the initial screen by the search request, through the communication management subprogram, and performs the necessary search. Do. The result is transmitted from the partner database system at any time and is displayed on the screen when a response is returned.

[0011]

As described above, the present invention handles the connection between one input / output terminal and a plurality of database systems as a one-to-one connection on the communication software, so that the communication processing is performed in the same manner as in the prior art. Since the input / output control program of the terminal unifies the responses from multiple database systems, it has been necessary to reconnect to the first multiple database systems when it was necessary to reconnect to another database. It takes a little extra time to connect, but the speed of searching for necessary data thereafter can be reduced. Further, there is an effect that complicated management by a method of centrally managing distributed databases is not required.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a display screen for explaining the operation of the embodiment of FIG.

FIG. 3 is a diagram showing an example of a display screen for explaining the operation of the embodiment of FIG.

FIG. 4 is a diagram showing an example of a display screen for explaining the operation of the embodiment of FIG.

5 is a diagram showing an example of a display screen for explaining the operation of the embodiment of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 communication control processor 2 database control processor 3 database 4 input / output terminal 11 communication control program 21 input / output control program 22 first communication management program 221, 222, -22n communication management subprogram 23 second communication management program 24 search program

Claims (1)

[Claims] 1. A distributed database search method in which a database system of the same type searches a distributed database connected to a circuit switching network, and the system is connected to a plurality of lines of the circuit switching network and is connected to the circuit switching network by a communication control program. A communication control processor for controlling, a first communication management program for receiving a search request from the input / output terminal means to a plurality of database systems connected to the circuit switching network, and transmitting response contents to the input / output terminal means; A plurality of communication management subprograms that instruct the communication control program to manage the connection of the search requests to the plurality of database systems received by the one communication management program to the respective database systems, and the communication control program performs circuit switching. A second communication management program for starting a session by an incoming call received from And a search program for searching a database through a session opened by the second communication management program.