JPH0512090A - Saving system of data base - Google Patents

Abstract

PURPOSE:To provide the saving system of a data base which can simultaneously confirm the justification of the storing logics of a data base saved at the time of saving the data base. CONSTITUTION:The title system is constituted of a storing means 15 to store the definition information necessary in order to evaluate the record storing condition of a data base, a first evaluating means 16 to evaluate the storing condition of a data base record for each page of a data base stored in a temporary storing means 14 by using the definition information stored in the storing means, a second evaluating means 17 to evaluate the storing condition of the whole of the data base from the evaluated result for all pages obtained by the first evaluating means and a means to save the data base stored in the temporary storing means to a permanent storing means after the storing condition of the whole of the data base is evaluated by the second evaluating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the validity of a database storage logic, and more particularly to a confirmation method for saving a database.

[0002]

2. Description of the Related Art Conventionally, when a database is saved in a storage medium such as a magnetic tape, the once saved database is read from the save storage medium and the validity of the storage logic of the saved database is confirmed. , It was read again to the evacuation medium. That is, conventionally, the saving operation of the database and the correctness confirming operation of the storage logic of the saved database have not been performed at the same time.

[0003]

As described above, in the conventional database saving, it is necessary to read the database into the save medium twice in order to confirm the validity of the storage logic of the saved database. , There was a waste of time.

Therefore, it is an object of the present invention to provide a database saving method that eliminates the above-mentioned conventional drawbacks by simultaneously confirming the correctness of the storage logic of the saved database when saving the database. Is.

[0005]

According to the present invention, the storage means for storing the definition information necessary for evaluating the record storage state of the database and the definition information stored in the storage means are used for temporary storage. First evaluation means for evaluating the storage state of the database record for each page of the database stored in the dynamic storage means, and the storage state of the entire database is evaluated from the evaluation results for all the pages obtained by the first evaluation means. The second evaluation means and the second
And a means for storing the database stored in the temporary storage means in the save storage means after the storage state of the entire database is evaluated by the evaluation means of 1. .

The definition information includes record type number and record length information.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a database saving method according to the present invention. The magnetic disk 11 stores a database 12, and the database 12 is saved by a database saving system 13. The database saving system 13 sequentially reads the database 12 into the reading area 14 which is a temporary storage unit in the database saving system 13. Database evacuation system 1
3 includes a database definition information storage unit 15.
The database definition information storage means 15 is a means for storing definition information necessary for evaluating the record storage state of each page of the database 12, such as a record type number and a record length.

The definition information stored in the database definition information storage means 15 is supplied to the in-page storage state evaluation means 16 (first evaluation means), where the reading area 14 is read.
The storage state of the database record is evaluated for each page of the database 12 stored in. The evaluation results are sequentially supplied to the database storage state evaluation means 17 (second evaluation means), and the contents of the database 12 are sequentially written to the magnetic tape 18 each time the evaluation of each page is completed. The database storage status evaluation means 17 evaluates the validity of the storage logic of the entire database 12 based on the evaluation results of the storage status of the database records of all pages in the database 12, and sends the result to the user of the database saving system 13. Notice. Therefore, the user of the database saving system 13 simultaneously saves the database 12 and confirms the correctness of its storage logic.

Items for evaluating the correctness of the storage state of the database record in each page of the database 12 differ depending on the type and attribute of the database.
Generally, the following items are listed. (1) Records in the database are consistent with the definition of records in the database. (2) If multiple records exist in the same page, the storage areas of the records do not overlap. (3) If an empty record exists, it must be correctly chained within the page without overlapping the storage area with other records. (4) If the record points to a page in another database, the pointed page must be within the valid range of the database.

[0011]

As described above, according to the present invention, since the validity of the storage logic of the database can be checked at the same time when the database is saved, the method is compared with the conventional method in which the validity of the storage logic is checked after the save of the database. And then 1/2
The validity of the storage logic at the time of saving can be confirmed in the processing time of.

[Brief description of drawings]

FIG. 1 is a block diagram showing a database saving method of the present invention.

[Explanation of symbols]

11 magnetic disk 12 Database 13 Database evacuation system 14 reading area 15 Database definition information storage means 16 Page storage status evaluation means 17 Database storage status evaluation means 18 magnetic tape

Claims (2)

[Claims] 1. A means for storing definition information necessary for evaluating a record storage state of a database, and definition information stored in this storage means for each page of the database stored in the temporary storage means. First evaluation means for evaluating the storage status of the database record, second evaluation means for evaluating the storage status of the entire database from the evaluation results for all pages obtained by the first evaluation means, and the second evaluation means. And a means for storing the database stored in the temporary storage means in the save storage means after the storage status of the entire database is evaluated by the evaluation means. 2. The database save method according to claim 1, wherein the definition information includes a record type number and record length information.