JPH0316353A - Data management system - Google Patents

Abstract

PURPOSE:To compare all correct data through transfer with only a revised data by sending only a data relating to the revision to an opposite equipment, using the revision data so as to allow a receiver side equipment to reproduce the correct data of the sender side equipment and allowing the receiver side equipment to compare and manage the correct data of both the equipments. CONSTITUTION:When data revision is commanded at the side of an equipment B, only a correct data 2 is revised to generate a new correct data for the equipment B, the data revision is detected by a data revision detection section 5 and a revised data transfer section 8 transfers the entire revised data to an opposite equipment A. The equipment A uses a data reproduction section 8 to merge a sub data 3 and the revised data 7 to reproduce the correct data 4 at the sender side and the result is stored in a memory 1. Then a data comparison section 9 compares the correct data 2 of its own equipment A with the correct data 4 of the sender side equipment B. Thus, the difference between all the correct data of the equipments A and B is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Summary) Regarding a data management method in which each of a plurality of devices that connect to a network has the same data, data comparison and management between devices after a data change is performed. The purpose is to make it possible to perform this on all data, even when the data is changed, so that each device stores the same primary and secondary data in its memory, and when inputting data changes, only the primary data is changed, and this data When the data change detection unit detects the change and the changed data transfer unit transfers all the changed data to the opposite device, and when the changed data is received from the opposite device, the data reproducing unit converts the changed data from the sub data 3. The transmitter's original data is reproduced and stored in the memory, and the data comparison unit detects the difference between the total original data of the own apparatus and the opposite apparatus by comparing the original data of the own apparatus and the transmitter's original data. Configure it as follows.

[Industrial Application Field] The present invention relates to a data management system, and particularly to a data management system between devices (hereinafter simply referred to as devices) that make up a network.

Identical data (e.g. programs,
As shown in Figure 11, in a system that maintains billing information, network connection information), data is originally
The data should match between devices A and B, and if data is changed independently on the device side, after that change, device IEA-B
It is necessary to verify the data between devices, recognize the changes to the data, and change the data in other devices as necessary. In this case, by comparing the data held by each device, data coincidence or mismatch is detected.

(Prior Art) Conventionally, the following two methods have been used to manage data between devices.

■ Data comparison method using all data transfer: In this method, in order to perform data comparison, all data including changed data is transferred to the opposing device and data is managed by comparison.

That is, as shown in FIG. 12, the devices A,
When device B has the same data from address 00 to FF, as shown in FIG.
If the data has been changed, device B transfers data in the format shown in FIG. 14 to device A from addresses OO to FF for data comparison.

Device A receives all the data from device B and uses address 00.
Data management is performed by comparing the data from to FF. ■ Partial data comparison method using changed data transfer: This method transfers only the changed data portion to the opposing device,
Data management is performed by comparing only that data.

In other words, from a state where the data contents of devices A and B have been lost by KLM, as shown in FIG. At this time, the device WB transfers information that address (12) has been changed to data N to device A.

Device A receives this and performs data management by comparing its own data M and received data N for address (12).

[Problem to be solved by the invention]

However, each of the above methods (1) and (2) has the following problems.

■Even if the changed data is small compared to the total amount of data, a large amount of data that does not need to be compared is transferred, so
The line is occupied for a long time for data comparison, which hinders the efficient operation of the network.

Although the line occupancy time is not as long as in ■■,
As shown in the figure, in addition to the data change M - N of device B,
The data of device A also has address OO from data K to data X.
When changed to address (12), even though the data difference occurred not only for address (12) but also for address 00, the W.A. We do not do this for other people. Therefore,
If data is changed at a location other than the received changed data, data comparison cannot be performed.

As described above, conventional technologies have had problems such as poor line efficiency and incomplete and inaccurate data comparison. Therefore, in a data management method in which each of a plurality of devices making up a network has the same data, the present invention enables data comparison and management between devices after data has been changed, even when data has been changed in the own device. The purpose is to make it possible to perform this on all data, including

[Means to solve the problem]

In order to solve the above-mentioned problems, the data management system according to the present invention, as a first means, as shown in principle in FIG.
Each device A, B stores the same primary and secondary data 2, 3 in the memory l.
When a data change is instructed on the device B side, only the primary data 2 is changed, new primary data of device B is generated, and the data change is transmitted to the data change detection unit 5.
detects this, and the changed data transfer unit 6 transfers all the changed data to the opposing device A.

Device A, which has received the changed data 7 from the opposite device B, uses the data reproducing unit 8 to combine the sub data 3 and the changed data 7, that is, overwrites the changed data on the sub data 3, and reproduces the reproduced data of device B, that is, the transmission. The original data 4 on the side is reproduced and stored in the memory l.

Then, the data comparison unit 9 compares the original data 2 of the self-installed device tA with the positive data 4 of the transmitting device B, so that the self-device A
The system is configured to detect the difference between the full genuine data of the opposite device B and the opposite device B.

In addition, as a second means, as shown in principle in FIG.
Each device includes an access type determining unit 11 that determines the content type of the change when data is input/output, an access time setting unit 12 that sets the time of the change, and the access type determining unit 11 and the access time setting unit l2. It has a change history data management section 14 that causes the memory 15 to hold the data as change history data.

Then, by comparing the change history data of the own device and the change history data transmitted from the opposite device, it is configured to detect whether or not the data in the own device matches the data in the opposite device.

[Effect]

In the first means, all the data related to the change is sent to the opposite device, and this changed data is used to reproduce the original data of the sending device on the receiving side, so that the receiving side can reproduce the original data of both devices. can be compared and managed. In the second means, each device stores its own device change history as data.

Therefore, it is possible to compare and manage the change history data transmitted from the opposite device and the change history data of the own device, if necessary.

Therefore, line usage time due to unnecessary data transfer can be reduced, and data management can be performed more accurately.

〔Example〕

First, an embodiment of the first means will be described.

2 to 4 show examples of data areas of the memories 1 of devices A and B shown in FIG.

Figure 5 shows an example of the frame format of changed data transferred between devices A and B, where F is a flag indicating a change, N is a number indicating how many addresses have changed data, and ADR
indicates the address of the change position. Furthermore, FIG. 6 shows a diagram when the frame format of FIG. 5 is actually used. Note that the data change detection unit 5 shown in FIG.
The modified data transfer section 6, the data reproduction section 8, and the data comparison section 9 represent functional blocks of a program executed by the CPU.

An embodiment of the data management shown in FIG. 1 will be described below with reference to these figures.

First, as an initial state, the primary data 2 of devices A and B must have lost once, and device A. - Perform operations such as copying between B. This state is shown in FIG. 2, where the data content is KLM, and both devices A and B have primary data 2 and sub data 3 have data KLM. Figure 3 shows the data memory area when data has been changed in one of the opposing devices, and device B has the original data 2.
is changed from KLM to KLN, the data change detection unit 5 of device B detects that the data of address 1/s (12) has been changed from M to N. 6. As shown in Figure 6(a), the flag F indicating the change
, the number of changed addresses is 1, the changed position address (12), and a certain frame data is generated from the changed data N to the device A.
Transfer to.

When the receiving device A receives the changed data 7, it stores it in the changed data area of the memory 1. According to this changed data file, the data reproducing unit 8 reproduces the sub data 3 of the own device A, and reproduces the changed new primary data KLN of the device B as the transmitting side primary data 4, as shown in FIG. Store in memory 1. Then, all the data are compared between the primary data 4KLN of the transmitting device B and the primary data KLM of the receiving device A, and the comparison result is output.

FIG. 4 shows a case where both opposing devices change data. When the primary data 2 of device A is changed from KLM to XYZ, and the primary data 2 of device B is also changed from KLM to KML, If you decide in advance that data comparison will be performed on the device A side, it is possible to
The modified data frame shown in FIG. 6(b) is transferred to the side.

This is received by device A, and this changed data 7 and sub data 3 are
From there, the data reproducing unit 8 reproduces the KML, which is the original data of the device B, and stores it in the data area of the memory l. By comparing the regenerated new primary data KML of device B with the changed, also new primary data Data can be compared without omission. The comparison results in the data comparison unit 9 can be used in various ways, for example, to match the primary data of one device with the primary and secondary data of the other device. I will explain about it.

FIGS. 8 to 10 show examples of data areas of the memories 15 of devices C and D shown in FIG.

It should be noted that the access type determination unit 111 access time setting unit 12 change history creation unit 14 and de? data comparison section 13
indicates each functional block of the program executed by the CPU. Further, it is assumed that all the data mentioned above are coded in terms of type and time.

An embodiment of the data management shown in FIG. 7 will be described below with reference to these figures.

As in the embodiment of the first means, as an initial state, the device C,
The data in D must match, and operations such as copying are performed between devices CD and D. The data here will be referred to as general data. Furthermore, the access type determination unit 11
The data determined by the above copy operation, that is, data indicating that device C has copied data to device D (Fig. 8 (7) COP'/TO (D)), device D has copied data from device C. data indicating that
The copyFROM (D) in FIG.
:00) is the change history data Bz,
They are each held in the memory 15 as B■. The data state in the memory 15 described above is shown in FIG.

? If, for example, device C is to perform data comparison in this state, change history data B■ is sent from device D to device C. Then, the data comparison unit 13 in the device C compares each change history data B II, B ! We will compare I.

At this time, it is detected that the general data in each device C and D match.

Next, a case will be described with reference to FIG. 9 in which part of the general data in the memory 15 of the rear device D in the state shown in FIG. 8 is changed. In this case, in addition to the previous change history data B■, device D also adds data (FIG. 9 MODIFY) indicating that a certain part of the data (indicated by an address) has been changed, and data indicating the time (FIG. 9 0). :15) is held in the memory 15 as change history data.

When data comparison is to be performed in this state, change history data B2I*BzN is transmitted from device D to device C. Then, the data comparison unit l3 in the device C compares each change history data Bll+ Bg++ B! ! will be compared. At this point, the device 11D finds that some data has been changed and detects a data mismatch. If some data is changed later on device C, a mismatch will be detected in the same way.
However, if the change history data indicates that the same change was made at the same time, a loss will be detected.

After the data state shown in FIG. 9, the device IC changes all the data, that is, copies all the data from another device E at time 0:45, and then device D copies all the data from the device E in the same way at time 1:05. Figure 10 shows the change history data for this case.
If all data is changed, the change history data up to that point is no longer needed, so the change history data up to that point is cleared.

Therefore, the remaining change history data is data indicating that it was copied from device E (Figure 10 COPY FROM (E)
) and data indicating the time (0:45, 1:0 in Figure 10)
5).

When performing data comparison in this state, device D sends change history data to device C as described above, and each change history data B, ! , B23 will be compared within device C.

At this time, the access type is the same, but the time is different. Since there is a possibility that data has been changed in device E during this time, in this case, a data mismatch is detected.

As described above, data is compared between each device, and data is managed by performing processes such as replacing data according to the results.

Furthermore, in the second data management method, by providing each device with a check code setting unit for adding a parity bit etc. to the change history data, accuracy is further increased. According to the first data management method according to the present invention, only the data related to the change is sent to the opposite device, and the original data of the sending device is reproduced by the receiving device using this changed data, This allows the receiving device to compare and manage the original data of both devices.
Comparison of total pressure data is possible by transferring only the changed data. Furthermore, according to the second data management method, it is possible to compare all data by using the data change history of each device and transmitting and comparing only each other's change history data as needed. Data transfer time can be reduced,
The remaining line usage time can be used for other purposes, and accurate data management without omissions can be realized.

[Brief explanation of the drawing]

FIG. 1 is a principle block diagram of the first data management method according to the present invention, and FIGS. 2 to 4 are diagrams showing embodiments of data areas of a memory used in the first data management method according to the present invention. , FIG. 5 is a diagram showing an example of the frame format of modified data in the method of the present invention, FIG. 6 is a diagram showing a frame of modified data used in the embodiment of the present invention, and FIG. 7 is a diagram showing a frame format of modified data used in the embodiment of the present invention. A block diagram of the principle of the management method. FIGS. 8 to 10 are diagrams showing examples of data areas of the memory used in the second data management method according to the present invention. FIG. 11 is a diagram of network configuration devices having the same data. 12 to 16 are diagrams for explaining the conventional method,
It is. In the figure, A, BSC, D... network configuration devices, 1, 15
...Memory, 2.. Primary data, 3.. Sub data, 4.. Transmission side primary data, 5.. Data change detection section, 6.. Changed data transfer section, 7.. Changed data, 8...Data reproducing section. 9, 13... Data comparison unit, 11... Access type determination unit, l2... Access time setting unit l4... Change history creation unit, 151... General data, 152... Change history data. Figure 2: The data in one device remains the same overnight 8 Figure 2 Changes the data in one device Figure 3 Changes the data in both devices Flash C>-====-1” () 1. L:==- +++++++12 wards 1 C) a1 N wards () Cl 0

Claims (2)

[Claims] (1) In a data management method in which each of a plurality of devices constituting a network has the same data, each device
The same primary and secondary data (2) and (3) are stored in the memory (1), and when changing data, only the primary data (2) is changed, and this data change is detected by the data change detection unit (5).
is detected and the changed data transfer unit (6) transfers all the changed data to the opposite device, and when the changed data (7) is received from the opposite device, the data reproducing unit (8) transfers the corresponding sub data (3). ) from the changed data (7) and stores it in the memory (1), and the data comparison unit (9) reproduces the original data (2) of its own device and the transmission side primary data. (4) A data management method characterized by detecting a difference between all authentic data of the own device and the opposite device by comparing the data. (2) In a data management method in which each of a plurality of devices constituting a network has the same data, each device
an access type determination unit (11) that determines the content type of the change at the time of data change input/output; an access time setting unit (12) that sets the time of the change; the access type determination unit (11) and the access time setting The data with part (12) is stored in memory (1) as change history data.
5), and a data comparison unit (13) that compares the change history data of the own device with the change history data sent from the opposite device. A data management method characterized by detecting coincidence or mismatch between data in the device and data in the opposing device.