JP2000267903A - Device for storing data divided into plural properties - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store data in a suitable medium in accordance with its property. SOLUTION: The storage device is provided with a property-divided storage means 2 for storing data suitably for their properties, a totalization means 23 for totalizing the application frequency of data, a distribution means 25 for distributing the application frequency in each property, and a reference setting means 26 for setting up reference application frequency in each property. It is especially preferable to prepare a moving means for moving data to a medium A or B to be a storage part suitable for the data when its property already stored in the means 2 is changed in accordance with application history. Since data are stored suitably for respective properties, a memory can be more effectively and suitably utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data storage device for a plurality of properties.

[0002]

2. Description of the Related Art Various data are stored in a database. Regardless of the frequency of use, all data is stored in the same medium having the same function and performance. Data that is rarely used is stored on high-priced, high-performance media, and frequently used data is often stored on low-cost, low-performance media. It often happens that people are inconvenienced.

It is desired that the data be stored on a suitable medium. In response to such demands, many techniques for storing data on a medium suitable for its properties are known. Among them, a representative Japanese Patent Application Laid-Open No. 5-12077,
This is a technique for selecting an appropriate storage medium for the data based on whether the access frequency is high or low.
The access frequency does not indicate the nature of the data. Even if the access frequency is high, data with a small amount of data may preferably (preferably) be stored on a low-speed medium.

[0004] It is desirable to find a suitable storage medium according to the different nature of the data.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data storage device for a plurality of properties in which data is stored in a medium suitable for the property.

[0006]

Means for solving the problem are described as follows. The technical matters corresponding to the claims in the expression are appended with numbers, symbols, etc. in parentheses (). The number, the symbol, etc. are at least one of the technical matters corresponding to the claims and the plurality of embodiments.
Although the agreement / correspondence with the technical matters of the two forms is clarified, it is not intended to show that the technical matters corresponding to the claims are limited to the technical matters of the embodiment.

The data storage device for plural characteristics according to the present invention comprises a characteristic storing means (2) for storing data in accordance with the plural characteristics. By storing data according to the plurality and properties thereof, the memory can be used more effectively and properly. Furthermore, it is preferable to provide a counting means (23) for counting the frequency of use of data for each property.

[0008] Further, it is preferable to provide a distributing means (25) for distributing the use frequency for each property and a reference setting means (26) for setting the reference use frequency for each property. It is particularly preferable to provide a moving means for moving the stored data to the storage medium (A, B) suitable for the data when the property of the already stored data is changed by the use history. The plurality of characteristics for setting the reference use frequency are read / write and / or the number of data, and are high speed and low speed of data.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Corresponding to the drawings, in an embodiment of a data storage device according to the present invention, a database 1 is provided together with a plurality of media A and B. FIG. The data part 2 and the index part 3 are provided in the database 1 as usual. The database 1 is further provided with a usage history section 4. The plurality of mediums A and B are included in the database 1. Multiple / Medium A, B
Data having different properties are sorted, sorted, and stored. There is a data movement relationship between the medium A and the medium B that has a data movement function in which data can be moved.

The index section 3 has a management function as to which of the medium A and the medium B each data is stored in. The usage history unit 4 manages history information on each data. A key value belongs to each data stored in the media A and B. The history information output by the usage history unit 4 includes a common key value, a history sequential number, medium identifiers A and B, and a usage form which is a property of the data.

The use mode is a property unique to each data specified from a plurality of properties. The property is one of a plurality of properties that form a pair. Pairs of plural / characteristics include read (characteristics in which read predominates over rewrite and correspond to the read frequency), rewrite (rewrite superiority than read, and correspond to the rewrite frequency), data It is a pair of a large number, a small number of data, high speed and low speed, and is often a combination having the opposite property. The number of pairs of the medium A and the medium B increases according to the type of such a combination.

[0012] The data storage device for plural properties is further provided with a statistical information DB 23. The index information 21 output from the index unit 3 and the history information 22 output from the usage history unit 4 are a statistical information DB 23
Is input to The tallying function of the statistical information DB 23 is based on the index information 21 and the history information 22,
4 is a function for creating the same.

[0013] The data storage device according to the plurality of properties is further provided with a reference DB 25. The reference DB 25 is
It has criterion information 26. The criterion information 26 includes a medium identifier and a criterion (such as a number). Reference DB25
Has a distribution function. In the distribution by the distribution function, based on the statistical information 24 output from the statistical information DB 23 and the determination criterion information 26, it is determined whether the data is suitable for the medium A or the medium B.

[0014] The data storage device for a plurality of properties is further provided with a movement information DB 27. Movement information DB
27 has movement information 28. The movement information 28
Includes common key values and destinations. The data movement function of the movement information DB 27 determines, based on the movement information 28 and the result information obtained by the distribution function, whether or not to move the data, or specifically determines the destination.

FIG. 2 specifically shows the counting function.
The index unit 3 has a common key value of 0001, 0002, 0003, 0004,.
And pointers 001, 002, 003, 004,.
And medium identifiers A and B. Usage history section 4
Is the sequential number of the history 0011, 0012, 0013, 0
014,... And the common key value 0001, 0002, 0
003, 0004,...
Usage forms include a delete (delete), a write (write), a rewrite (rewrite), and a read (read).

The statistical information DB 23 creates the statistical information 24 from the index information 21 and the history information 22 by using its totalizing function. The statistical information 24 is illustrated with respect to the common key value 0001. Data 00
For 01, the history information 22 indicates that read is performed twice and rewrite is performed once. The medium identifier is determined to be A from the common key value.

FIG. 3 shows the distribution function in detail. The statistical information DB 23 indicates the statistical information 22 for a plurality of data. The reference DB 25 indicates the specific value. For the medium B, the number of reads is set to 5, and the number of rewrites is set to 5. The reference DB 25 indicates that the data should be stored in the medium A when the read count is larger than 5 or the rewrite count is larger than 5. If they are 5 or less,
The data will be stored on the medium B.

According to the setting of such a reference value, the storage medium for the data of the common key value 0001 is suitable for B and therefore it is appropriate that the movement is executed.
02 is suitable for the transfer of the common key value 0003, and the storage medium for the data of the common key value 0003 is suitable for the transfer of the common key value 0004. It is respectively determined that the data storage medium is suitable for A and therefore the movement is not executed. Based on such a distribution determination, the movement information DB 27 specifies a movement destination, and movement to the transfer destination is executed by the data movement function.

[0019]

In the data storage device according to the present invention, data is stored in an appropriate medium corresponding to the characteristics, and the use of the memory for storing data is optimized.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of a data storage device for plural properties according to the present invention.

FIG. 2 is a system flow diagram showing an embodiment of a data storage device for plural properties according to the present invention.

FIG. 3 is a system flow diagram showing another embodiment of the data storage device for plural properties according to the present invention.

[Explanation of symbols]

 2 ... Property storage means 23 ... Aggregating means (statistical information DB) 25 ... Distributing means (reference DB) 26 ... Reference setting means (judgment reference information) A, B ... Medium

Claims (8)

[Claims] An apparatus for storing data according to a plurality of properties, comprising storage means according to properties for storing data according to the plurality and properties thereof. 2. The data storage device according to claim 1, further comprising a totaling unit for totalizing a use frequency of using said data for each property. 3. The data storage device according to claim 2, further comprising a distribution unit for distributing the use frequency according to the property. 4. The moving means according to claim 3, further comprising a moving means for moving the data whose properties have been changed by the distribution by said distributing means to a portion of said property-specific storage means suitable for said data. A data storage device according to a plurality of properties, characterized in that: 5. The data storage device according to claim 3, further comprising: reference setting means for setting a reference use frequency for each property. 6. The data storage device according to claim 3, wherein the plurality of properties for setting the reference use frequency are read and rewrite. 7. The data storage device according to claim 5, wherein the plurality of characteristics for setting the reference use frequency include a large number of data and a small number of data. 8. The data storage device according to claim 5, wherein the plurality of characteristics for setting the reference use frequency are high speed and low speed.