JP2009181188A - Prediction type cache method for caching information having high possibility of being used, and its system and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that data which have never been accessed are not cached in the conventional cache system, since only data accessed by a user are cached. <P>SOLUTION: The substance of information to be used by the user is recorded, and highly significant information out of pieces of recorded information is stored, and how far the information to be used by the user is from a reference time is recorded, and which item of the information is to be paid attention is defined for each of the types of information to be used by the user. An access request is received, and information is retrieved from either a cache storage means or a data storage means, or from both of them, and the requested information acquired as the result of retrieval is returned to the origin of request, and the highly significant information is recorded in the cache storage means by referring to a time item definition means and a time information storage means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cache method, a system thereof, and a program thereof, which can be accessed at a high speed during subsequent access by caching information in a cache data management structure.

  A cache system system related to the present invention will be described. FIG. 1 is a diagram showing a configuration of a cache system related to the present invention. Referring to FIG. 1, the cache system related to the present invention is composed of a data storage device, a cache management device, and a cache storage device.

  Regarding the storage capacity, the data storage device is sufficiently larger than the cache storage device. As a premise, all data is stored in the data storage device. On the other hand, data that is frequently accessed among the data in the data storage device is recorded in the cache storage device. In terms of retrieval speed, the cache storage device can retrieve data faster than the data storage device.

  The operation of the conventional cache system having such a configuration will be described below.

  A user or system issues a search request to the cache management device. The search request includes a unique number (ID) or search condition formula necessary for retrieving information from the data storage device. A unique number (ID) for identifying the data is assigned to the data in the data storage device. When the cache management device receives the search request, it inquires of the cache storage device whether the data of the ID requested by the search request is stored in the cache storage device.

  If there is data of the requested ID in the cache storage device, the data is retrieved from the cache storage device and returned as a search result to the search request source. On the other hand, if there is no data with the requested ID in the cache storage device, the data storage device is searched. When the requested ID data exists in the data storage device, the requested ID data is retrieved from the data storage device. The fetched data is returned to the search request source as a search result and input to the cache storage device.

  When a search request is made with the same ID after the next time, the cache management device can read the data at high speed without searching the data storage device by checking the cache storage device.

  In this regard, in the cache system as described above, before the data is actually needed, by loading and holding the data that has the probability of being needed into the memory, the performance is actually improved, and the performance is improved. There has been a memory management technique that can perceive the above (see, for example, Patent Document 1).

The invention described in Patent Document 1 prioritizes data pages with values / scores according to various factors including frequency of use, last used time, ease of data transfer, and other context-based information. wear. This allows the mechanism to prefetch and / or retain more valuable data in memory. If it is necessary to write or overwrite the data on the disk, the request can be predicted even if there is no actual request, and the data can be automatically returned in a resilient manner.
JP 2004-133934 A

  The invention described in Patent Document 1 has a problem. The problem is that only data accessed at least once is cached. The reason is that, since the data is cached based on the access frequency and the last access time, data that has never been accessed is not cached.

  Therefore, the present invention provides a predictive pre-cache that can be cached before a subsequent access request based on the contents indicating the time in the data managed by the user, regardless of the use history of the record of the data (record). It is an object to provide a method, a system thereof, and a program thereof.

  According to a first aspect of the present invention, there is provided a cache system that caches data as a system, wherein data storage means for recording an entity of information used by a user, and information stored in the data storage means Among them, cache storage means for storing highly important information, time information storage means for recording how far the information used by the user is away from the reference time, and information for each type of information used by the user Requested information obtained as a result of retrieval by retrieving information from either or both of the cache storage means and data storage means upon receiving an access request and time item definition that defines which item to focus on Is returned to the requesting source, and the time item definition means and the time information storage means are referred to, and the predictive cache manager who records high importance information in the cache storage means When, cache system comprising: a provided.

  According to the second aspect of the present invention, a search request from a user as a terminal is received, a cache storage means provided in the device or another device connected to a communication network is searched, and the requested information is transmitted to the user. The cache management means for acquiring information close to the reference time of the requested information from other devices connected to the communication network and recording the information in the cache storage means, and the cache management means are connected to the communication network. There is provided a terminal comprising: a cache storage unit that records information received from another device; and an application execution unit that can execute a program according to the use of the received information.

  According to the third aspect of the present invention, the server receives a search request from the user, searches the data storage means, returns the requested information to the request source, and the information used by the user from the reference time. Refer to the time information storage means to record how far away it is and the time item definition that defines which item of information to focus on for each type of information used by the user. A predicted cache management means for transmitting, a data storage means for storing user information, a time information storage means for storing a difference between a time item to be noted and a reference time of information specified in the time item definition, A server characterized by comprising: is provided.

  According to a fourth aspect of the present invention, there is provided a cache method for caching data as a method, wherein a data storage step for recording an entity of information used by a user, and information stored in the data storage step A cache storage step for storing the most important ones, a time information storage step for recording how far the information used by the user is away from the reference time, and information for each type of information used by the user. The step of preparing the time item definition that defines which item is focused on, and the access request, information is retrieved from either the cache storage step or the data storage step, or both, and the result of the search is obtained. The requested information is returned to the requester, and the time item definition step and the time information storage step are referred to, and the highly important information is captured. Caching method characterized in that it comprises a prediction cache management step of recording the Interview storage step, is provided.

  According to a fifth aspect of the present invention, there is provided a cache program for caching data as a program, a data storage function for recording an entity of information used by a user, and information stored in the data storage function. Among them, a cache storage function for storing highly important information, a time information storage function for recording how far the information used by the user is away from the reference time, and information for each type of information used by the user. A function that prepares a time item definition that defines which item to focus on, and an access request, information is retrieved from either the cache storage function or the data storage function, or both, and as a result of the search, The requested information is returned to the request source, and the time item definition function and the time information storage function are referred to, and the information with high importance is recorded in the cache storage function. Cache program, characterized in that to achieve a cache management function, to the computer is provided.

  According to the present invention, when a record is needed, a record close to the reference time is obtained by referring to the value of the field indicating the time and date of the record and the reference time, taken out from the data storage device, and cached in advance. For this reason, it is possible to cache a record close to the reference time defined based on the contents of the record possessed by the user before a subsequent access request regardless of the presence or absence of the record use history.

  Next, the outline of the embodiment of the present invention will be described with reference to FIG.

  A predictive pre-cache system that predicts data close to a reference time, which is an embodiment of the present invention, includes a pre-predictive cache management device 11, a time item definition 12, a data storage device 13, a time information storage device 14, A cache storage device 15 is included.

  The prior prediction cache management device 11 is a device having a function of predicting next necessary data and taking out data necessary in advance by paying attention to an item indicating time among the contents of data held by the user. The time item definition 12 defines which time item is focused. The data storage device 13 is a device that stores data. The time information storage device 14 is a device that records how important the data is. The cache storage device 15 is a device that performs cache storage.

  The operation of this system will be described below.

  A search request is issued to the prior prediction cache management device 11 based on a user input or a system request. The search request includes a unique number (ID) or a search condition expression necessary for retrieving information from the data storage device 13. When receiving the search request, the advance prediction cache management device 11 inquires of the cache storage device 15 whether there is data corresponding to the requested ID or the search condition expression.

  If there is corresponding data in the cache storage device 15, the data is returned to the search request source as a search result. On the other hand, if there is no corresponding data in the cache storage device 15, the data storage device 13 is searched. If there is data corresponding to the search request in the data storage device 13, the data is retrieved and returned as a search result.

  Subsequently, the time information in the time information storage device 14 is referred to, and data close to the reference time is searched from the data storage device 13. Data close to the reference time is extracted from the data recording structure, and the data is input to the cache storage device 15. By adopting such a configuration, executing the above-described operation, and caching not only the data requested by the search request but also the data close to the reference time, the object of the present invention can be achieved.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings.

  The embodiment of the present invention operates under program control, and includes a client terminal 1 composed of a computer or a device, a computer serving as a server 2, and a communication path 3 for communication between the server and the client.

  The client terminal 1 includes an application 101 that provides an operation screen and application functions for a user, a client-side cache management device 102 that controls a search request from the application and a cache storage device, and a cache storage device 103 that manages cache data. Have

  The server 2 manages the cache and predicts the next necessary data from the search request, the time item definition 202 that defines which item is focused on in the data, and how much the data is the reference time A time information storage device 203 for recording information on whether the data is close to the data base, and a database 204 for storing data.

  The functions of these devices will be described below.

  The application 101 of the client terminal 1 receives an operation from the user of the client terminal 1. When data is required, a data retrieval request is issued to the cache management apparatus 102 on the client side. The search request includes a search condition expression or ID indicating which data is necessary. The data received as a search result is displayed on the screen. In addition, each application has a unique function for each application.

  The client side cache management apparatus 102 processes a search request from the application 101 of the client terminal 1. Specifically, when a search request is received, the client-side cache management device 102 searches the cache storage device 103 using the search condition expression or ID included in the search request to determine whether there is data corresponding to the search request. . If there is data in the cache storage device 103 as a result of the search, the data is returned to the search request source application 101 as a search result. If there is no data corresponding to the search request in the cache storage device 103, the search request is transmitted to the server-side prior prediction cache management device 201 of the server 2. Data obtained as a result of the search request to the server 2 is returned to the application 101. The server 2 also sends data that is determined to be cached by prior prediction. The client side cache management apparatus 102 inserts the data sent based on these prior predictions into the cache storage apparatus 103.

  The client side cache storage device 103 stores the data received from the server 2 by the client side cache management device 102. The cache storage device 103 manages data using a data management structure such as LRU (Least Recently Used), hash, list structure, and B-tree. Further, the cache storage device 103 processes a search from the client side cache management device 102. The search is performed by searching the cache storage device 103 for data that matches a given search condition expression or ID.

  The server-side prior prediction cache management apparatus 201 processes the search request sent from the client-side cache management apparatus 102 and returns a search result. In this search, the database 204 is searched using the search condition formula included in the search request, and the corresponding data is transmitted to the client side cache management apparatus 102. Further, from the content of data returned as a result of the search request, the user searches the database 204 for the next necessary data, and transmits the result to the client terminal 1 as data to be pre-cached.

  Information relating to how close the data is to the reference time is recorded in the time information storage device 203. How close the data is to the reference time is calculated by referring to the record contents of each data in the database 204 and the time item definition 202.

  The data entity is stored in the database. In this embodiment, an RDBMS (Relational DataBase Management System) is used for the database. In this regard, other database management systems other than the RDBMS may be employed.

  Next, the overall operation of the present embodiment will be described in detail with reference to the flowchart of FIG.

  First, a record (data) is required for some reason (user operation request, application start) in the application 101 of the client terminal 1 (step S1 in FIG. 4).

  When data is required, the application 101 issues a search request for requesting a record to the cache management apparatus 102 on the client side (step S2). The cache management apparatus 102 that has received the search request searches the cache storage apparatus 103 based on the search condition expression of the search request (step S3).

  If a record exists in the cache storage device 103, the record is returned to the application 101 as a search result (step S5). At this time, the server 2 is notified that the record has been accessed (step S6).

  On the other hand, if there is no record in the cache storage device 103, a search request is transmitted to the server 2 (step S10).

  The server-side prior prediction cache management apparatus 201 that has received the search request searches the database 204 using the search condition expression of the search request (step S11). If there is no search result in the database 204, the client terminal 1 is notified that there is no corresponding record, and the client terminal 1 that has received the notification notifies the application 101 (steps S14 and S15). On the other hand, if there is a record corresponding to the search condition in the database 204, the corresponding record is transmitted to the client terminal 1 (step S13).

  When the server 2 side database 204 is searched by a request from the client and the corresponding record is found, or when the server 2 side receives a notification that the record in the cache storage device 103 of the client terminal 1 is accessed, the server 2 The prior prediction cache device 201 on the side checks whether it is necessary to update the storage contents of the time information storage device 203 (step S7).

  Here, when it is necessary to update the time information, the storage contents of the time information storage device 203 are updated with reference to the contents of the records of the time item definition 202 and the database 204 (step S16). After updating the time information or when it is confirmed in step S7 that updating of the time information is not necessary, the time information in the time information storage device 203 is referred to and a record close to the reference time is obtained from the database 204 (step S8). ). The obtained record is transmitted to the client terminal 1 as a record to be cached in advance (step S9).

  Hereinafter, a method for obtaining a record close to the reference time by referring to time information from the time information storage device in step S8 will be described.

  FIG. 5 is a diagram showing the contents of the time item definition 202. The time item definition 202 includes items of a table name, a field name, a reference time, and a search direction. The table name is the name of the target table for defining the time item, and the field name indicates which field to focus on in the target table name. The field of interest specified as the field name is a field having a temporal value or order. The reference time is a starting time, and data closer to this time is regarded as important data. The search direction is a field indicating the direction of search, and specifies whether to search only the past, only the future, or both from the reference time. In addition, the search direction is not only the concept of the past direction and the future direction, but also the period of the search target such that the past one month is the target of search, and the search target is up to one month later. Can be specified.

  FIG. 6 shows an example of information stored in the time information storage device 203. In the time information storage device 203, a record number and a time difference between the reference time of the record number and the elapsed time are recorded. Further, a table name may be recorded as necessary. By referring to this information, the server-side prior prediction cache management apparatus 201 can obtain the difference from the reference time of each record without calculating each time.

  FIG. 7 is a diagram for explaining a method of determining whether the time is close to the reference time by taking “mail” as an example.

  First, with reference to the time item definition 202 described above, it is checked which field of the mail is focused. When the definition example of FIG. 5 is used, since the electronic mail table is defined to refer to the reception date / time field, attention is paid to the reception date / time field. The reference time is now, and the search direction is only the past. FIG. 7 shows the mail reception date and reference time on the time axis. Here, an email close to the reference time is an important email. In the case of FIG. 7, the important mails are in the order of 1, 2, 3, 4, and so on.

FIG. 8 is a diagram showing a method for determining whether the time is close to the reference time by taking “schedule” as an example. In this case as well, the field of interest is obtained by referring to the time item definition as in the previous example. In the case where the time item definition is shown in FIG. 5, the field of interest in the case of a schedule is the schedule start time.
The reference time is now, and the direction of search is both past and future. FIG. 8 shows the schedule displayed on the time axis as in the previous example. Here, the time difference between the scheduled start time and the reference time is determined, and the important schedule is determined in the order of the schedule having the scheduled start time close to the reference time. In the example of FIG. 8, the schedules are important in the order of 9, 10, 8, 7, and 11.

  Also in the example of “slip” in FIG. 9, it is determined whether it is close to the reference time by the same method as before. In this case, the field of interest is the last modification date and time of the slip, and the reference time is the end of last month. The search direction and search range are the past month. Therefore, the important slips close to the reference time are in the order of 5, 6, 7 and 8. Note that it takes time to obtain the difference between the time of interest of all records and the reference time. Therefore, the difference from the reference time is not always obtained for all the records, but the difference from the reference time is periodically obtained as necessary, and the result is recorded in the time information storage device 203.

  Next, the effect of this embodiment will be described.

  In this embodiment, in addition to the record requested by the client terminal, a record close to the reference time is transmitted from the server to the terminal from the contents of the field indicating the time of the record possessed by the user.

  The server also has a time information storage device that records the interval between the reference time and the time of interest of each record, and determines the importance by determining whether the record is close to the reference time. Because of the above configuration, it is possible to cache a record requested by the client terminal and a record that is likely to be used by the client terminal. For this reason, when a record with high importance is read again, it is not necessary to communicate with the server again, so that the reading speed can be improved. Furthermore, even if the client and server cannot communicate, records that are close to the reference time and have high importance can be referred to because they are cached.

  In the conventional prefetch method, the access frequency and the last access time are recorded and the information is referred to, but in the embodiment of the present invention, the field value indicating the time and the date and time defined in the time information definition is referred to. And cache. For this reason, data that has never been used can be cached.

  Next, a modification of the configuration of the embodiment of the present invention will be described as an example.

  FIG. 10 illustrates a stand-alone example in which the server and the client (terminal) are not separated, unlike the above-described embodiment. Also in the present embodiment, the processing flow excluding the portion for transmitting and receiving data on the communication path is the same as that in the above-described embodiment.

  FIG. 11 shows an embodiment in which the time information storage device is not used and the difference from the reference time is obtained by referring to the contents of the data every time the client requests data. The processing procedure in the case of this example is the same as that of the above-described embodiment.

  FIG. 12 shows an embodiment in which information indicating the time (date and time) and other information stored in the time information storage device illustrated in FIG. 6 are stored in another device. Even in the case of the present embodiment, the processing procedure is the same as that of the above-described embodiment.

  FIG. 13 is an implementation example in which a cache management device that manages a cache and a prediction device that predicts data close to a reference time by referring to a time item definition and a time information storage device are realized by different devices. Even in the case of the present embodiment, the processing procedure is the same as that of the above-described embodiment. Note that the prediction device can predict necessary data regardless of whether the data storage device or the cache device is referenced.

  In addition, each apparatus which comprises the prediction type cache system and system which are embodiment of this invention is realizable with a hardware, software, or these combination.

  INDUSTRIAL APPLICABILITY The present invention is suitable for applications such as reducing communication waiting time in an environment where required data is requested from a mobile phone from a server. Further, the present invention can be applied to uses such as obtaining frequently used data from data accessed by a terminal.

It is a block diagram which shows the structure of the form of the conventional cache system. It is a block diagram which shows the structure of embodiment of this invention. It is a block diagram which shows the structure of the best form for implementing this invention. It is a flowchart which shows operation | movement of the best form for implementing this invention. It is a flowchart which shows operation | movement of the best form for implementing this invention. It is a figure which shows the example of a recording of the time item definition for implementing this invention. It is a figure which shows the example of a recording of the time information storage device for implementing this invention. It is a figure which shows the judgment system of whether it is near the reference time in the mail for implementing this invention. It is a figure which shows the judgment system of whether it is near the reference time in the schedule for implementing this invention. It is a figure which shows the judgment system of whether it is near the reference | standard time in the slip for implementing this invention. It is a block diagram which shows the structure by the stand-alone which is another embodiment of this invention. It is a block diagram which shows the structure of the Example which does not use the time information storage device which is another embodiment of this invention. It is a block diagram which shows the structure of the Example which preserve | saves the time value of the data which is another embodiment of this invention in another memory | storage device. It is a block diagram which shows the structure of the Example in case the cache management apparatus which is another embodiment of this invention, and a prior prediction apparatus are another apparatuses.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Client terminal 2 Server 3 Communication path 11 Predictive cache management apparatus 12 Time item definition 13 Data storage apparatus 14 Time information storage apparatus 15 Cache storage apparatus 101 Application 102 Client side cache management apparatus 103 Cache storage apparatus 201 Server side cache management apparatus 202 Time item definition 203 Time information storage device 204 Database 301 Disk 401 Date and time recording device 501 Cache management device 601 Advance prediction device

Claims (36)

A cache system for caching data,
Data storage means for recording the substance of information used by the user;
Cache storage means for storing highly important information stored in the data storage means;
Time information storage means for recording how far the information used by the user is from the reference time;
A time item definition that defines which item of information to focus on for each type of information used by the user,
Upon receiving an access request, information is retrieved from either or both of the cache storage means and the data storage means, the requested information obtained as a result of the search is returned to the request source, and the time item definition means and time information A predictive cache management unit that refers to the storage unit and records high importance information in the cache storage unit;
A cache system comprising: The cache system according to claim 1,
The degree of importance in the predictive cache management means is calculated by referring to information in the data storage device and obtaining a difference between the value of the item in the information specified in the time item definition and the reference time. A cache system characterized by The cache system according to claim 1 or 2,
A cache system, wherein the importance in the predictive cache management means is calculated in advance before receiving the access request. The cache system according to any one of claims 1 to 3,
The prediction cache management means, when receiving an access request for information, first searches the cache storage means, and if there is no requested information in the cache storage means, searches the data storage means . The cache system according to any one of claims 1 to 3,
It further comprises either or both of an information carrying means for carrying information between the cache storage means and the data storage means, a prediction cache means for predicting information to be cached,
When the prediction cache management means receives an access request to information, it first searches the cache storage means, and when there is no requested information in the cache storage means, any of the data storage means, the prediction cache means, and the information carrying means A cache system, wherein the requested information is retrieved from the data storage means and stored in the cache storage means. The cache system according to any one of claims 1 to 5,
The cache system further comprises means for predicting highly important information with reference to a time item definition and time information storage means. The cache system according to any one of claims 1 to 6,
The prior prediction cache management means searches for information recorded in the cache storage means and the data storage means using a search condition formula or a unique number. The cache system according to any one of claims 1 to 7,
The time information storage means stores a plurality of definitions including a table name that can be omitted if there is only one, a field name that can be omitted if there is only one, a reference time, and a search direction. A cache system characterized in that means can be used to calculate the importance by referring to the definitions. The cache system according to any one of claims 1 to 8,
2. The cache system according to claim 1, wherein the time information storage unit stores a plurality of rules including a record number and an elapsed time from a reference time, and the prediction cache management unit can refer to the rules. The cache system according to any one of claims 1 to 9, wherein the cache system is connected to a client making an access request via a network.
A cache system, further comprising: a transmission unit configured to transmit information requested to be accessed and related highly important information to the client as a request source via the network. In response to a search request from the user, the cache storage means provided by the user or another device connected to the communication network is searched, the requested information is returned to the user, and the other device connected to the communication network Cache management means for acquiring information close to a reference time of the requested information and recording the information in the cache storage means;
A cache storage means for recording information received from another device connected to the communication network;
Application execution means capable of executing a program according to the use of the received information;
A terminal comprising: Time information storage means for receiving a search request from the user, searching the data storage means, returning the requested information to the request source, and recording how far the information used by the user is from the reference time; A prediction cache management means for referring to a time item definition that defines which item of information is focused on for each type of information used by the user, and transmitting information close to the reference time to the user,
Data storage means for storing user information;
Time information storage means for storing the difference between the time item to be noted and the reference time of the information specified in the time item definition;
A server comprising: A caching method for caching data,
A data storage step for recording an entity of information used by the user;
A cache storage step for storing highly important information stored in the data storage step;
A time information storage step for recording how far the information used by the user is from the reference time;
Providing a time item definition that defines which item of information to focus on for each type of information used by the user;
Receives an access request, retrieves information from either or both of the cache storage step and / or data storage step, returns the requested information obtained as a result of the retrieval to the request source, and defines a time item definition step and time information A predictive cache management step that references the storage step and records high importance information in the cache storage step;
A caching method comprising: The cache method according to claim 13,
The level of importance in the predictive cache management step is calculated by referring to the information in the data storage device and calculating the difference between the value of the item in the information specified in the time item definition and the reference time A caching method characterized by the above. The cache method according to claim 13 or 14,
A cache method, wherein the importance in the predictive cache management step is calculated in advance before receiving the access request. The cache method according to any one of claims 13 to 15,
The prediction cache management step, when receiving an access request for information, first searches the cache storage step, and if there is no requested information in the cache storage step, searches the data storage step . The cache method according to any one of claims 13 to 15,
One or both of an information carrying step for carrying information between a cache storage step and a data storage step, a prediction cache step for predicting information to be cached, or both,
When the prediction cache management step receives an information access request, the cache storage step is searched first, and when there is no requested information in the cache storage step, any of the data storage step, the prediction cache step, and the information carrying step A cache method, wherein the requested information is retrieved from the data storage step and stored in the cache storage step. The cache method according to any one of claims 13 to 17,
The prediction cache management step further comprises a step of predicting highly important information with reference to a time item definition and a time information storage step. The cache method according to any one of claims 13 to 18, comprising:
The predictive cache management step searches for information recorded in the cache storage step and the data storage step using a search condition formula or a unique number. The cache method according to any one of claims 13 to 19, wherein
The time information storage step stores a plurality of definitions including a table name that can be omitted if there is only one, a field name that can be omitted if there is only one, a reference time, and a search direction. A cache method characterized in that a step can be used to calculate the importance by referring to the definitions. The cache method according to any one of claims 13 to 20, wherein
The time information storage step stores a plurality of rules including a record number and an elapsed time from a reference time, and the prediction cache management step can refer to each rule. The cache method according to any one of claims 13 to 21, wherein the cache method is connected to a client making an access request via a network.
A cache method, further comprising: a transmission step of transmitting information requested to be accessed and the related highly important information to the requesting client via the network. In response to a search request from the user, the cache storage step provided by the user or another device connected to the communication network is searched, the requested information is returned to the user, and the other device connected to the communication network A cache management step of acquiring information close to a reference time of the requested information and recording it in the cache storage step;
A cache storage step for recording information received from another device connected to the communication network;
An application execution step capable of executing a program according to the use of the received information;
A caching method comprising: A time information storage step for receiving a search request from the user, searching for a data storage step, returning the requested information to the request source, and recording how far the information used by the user is from a reference time; Predictive cache management step of sending information close to the reference time to the user with reference to the time item definition that defines which item of information to focus on for each type of information used by the user,
A data storage step for storing user information;
A time information storage step for storing a difference between a time item to be noted in the information specified in the time item definition and a reference time;
A caching method comprising: A cache program for caching data,
A data storage function for recording the substance of information used by the user;
A cache storage function for storing highly important information stored in the data storage function;
A time information storage function that records how far the information used by the user is from the reference time;
A function for preparing a time item definition that defines which item of information to focus on for each type of information used by the user,
Receives an access request, retrieves information from either or both of the cache storage function and data storage function, returns the requested information obtained as a result of the search, and returns to the request source the time item definition function and time information A predictive cache management function that references the storage function and records highly important information in the cache storage function;
A cache program characterized by causing a computer to realize the above. The cache program according to claim 25, wherein
The degree of importance in the predictive cache management function is calculated by referring to the information in the data storage device and obtaining the difference between the value of the item in the information specified in the time item definition and the reference time A cash program characterized by The cash program according to claim 25 or 26,
A cache program, wherein the importance in the predictive cache management function is calculated in advance before receiving the access request. A cash program according to any one of claims 25 to 27, wherein
The prediction cache management function searches for a cache storage function when receiving an access request to information, and searches for a data storage function when there is no requested information in the cache storage function. . A cash program according to any one of claims 25 to 27, wherein
An information carrying function for carrying information between the cache storage function and the data storage function, a prediction cache function for predicting information to be cached, or both,
When the prediction cache management function receives an access request to information, it first searches the cache storage function, and when there is no information requested for the cache storage function, any of the data storage function, the prediction cache function, and the information transport function A cache program, wherein the requested information is retrieved from the data storage function and stored in the cache storage function. A cash program according to any one of claims 25 to 29, wherein
The prediction cache management function causes a computer to further realize a function of predicting highly important information with reference to a time item definition and a time information storage function. A cache program according to any one of claims 25 to 30, wherein
The predictive cache management function searches for information recorded by the cache storage function and the data storage function using a search condition formula or a unique number. A cash program according to any one of claims 25 to 31,
The time information storage function stores a plurality of definitions including a table name that can be omitted if there is only one, a field name that can be omitted if there is only one, a reference time, and a search direction. A cache program, wherein a function can be used to calculate the importance level with reference to each definition. A cache program according to any one of claims 25 to 32, wherein
The time information storage function stores a plurality of rules including a record number and an elapsed time from a reference time, and the predictive cache management function can refer to each rule. The cache program according to any one of claims 25 to 33, which is connected to a client that makes an access request via a network.
A cache program for causing a computer to further realize a transmission function of transmitting information requested to be accessed and related highly important information to the client as a request source via the network. In response to a search request from a user, it searches a cache storage function that it implements on the computer or other devices connected to the communication network, returns the requested information to the user, and others connected to the communication network A cache management function for acquiring information close to a reference time of the requested information from the device and recording the information in the cache storage function;
A cache storage function for the cache management function to record information received from other devices connected to the communication network;
An application execution function capable of executing a program according to the use of the received information;
A cache program characterized by causing a computer to realize the above. A time information storage function that receives a search request from the user, searches the data storage function, returns the requested information to the request source, and records how far the information used by the user is from the reference time; A prediction cache management function that refers to a time item definition that defines which item of information to focus on for each type of information used by the user, and sends information close to the reference time to the user,
A data storage function for storing user information;
A time information storage function for storing a difference between a time item to be noted in the information specified in the time item definition and a reference time;
A cache program characterized by causing a computer to realize the above.

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