JP2006352641A - Domain information storage apparatus, domain information storage method, and domain information storage program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a processing burden and to accelerate a processing speed when updating domain information stored in a DNS server system. <P>SOLUTION: When dynamic update request information requesting the dynamic updating of zone data is received from a DNS dynamic update client device 3, a primary DNS server system device 1 updates zone data stored in a database 14 while reflecting the data with the accepted dynamic update request information and stores the dynamic updating information in a dynamic updating information table stored in a memory journal 16. The primary DNS server system device reads and acquires from the memory journal information relating to the dynamically updated zone data requested by a differential zone transfer request telegraph, creates a differential zone transfer response telegraph using such information relating to the zone data and transmits the created telegraph to a secondary DNS server system device 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention updates domain information stored together with a backup device in response to an update request from a client device, and transmits the update information created in response to the update request to the backup device The present invention relates to a storage device, a domain information storage method, and a domain information storage program.

  Conventionally, a DNS server system that associates domain names on the Internet with IP addresses, mail server names, and the like has been used. This DNS server system stores zone data that is information in which domain names are associated with resource data (IP address, mail server name, etc.). Specifically, the DNS server system includes a primary DNS server system that holds the original zone data and a secondary DNS server system that holds a copy of the zone data.

  The primary DNS server system manages the zone data in a permanent storage device such as a disk, and also manages the zone data in a high-speed temporary storage device such as a memory.

  The primary DNS server system accepts a query request for requesting a resource record query for the domain name from the client. For example, when a query request for requesting resource data corresponding to a specific domain name is received from the client to the primary DNS server system, the resource data corresponding to the specific domain name is notified to the client using zone data. .

  By the way, when the DNS server system receives a request for dynamic update (registration, deletion or change of zone data) of zone data from another system or client, the zone data in the databases of the primary DNS server system and the secondary DNS server system It is updated by the following method (for example, see Non-Patent Document 1 and Non-Patent Document 2).

  Specifically, when the primary DNS server system receives a request for dynamic update of zone data (registration, deletion or change of domain name and resource data) from another system or client, the primary DNS server system performs memory based on the dynamic update request. Update the zone data in In addition, a journal file in which the dynamically updated information is recorded is created, and a serial number is assigned to the journal file and stored in the disk. At this point, the primary DNS server system has not yet updated the zone data file in the disk that is the original zone data.

  Following this, the primary DNS server system transmits an update notification indicating that dynamic update has been performed to the secondary DNS server system. The secondary DNS server that has received the update notification transmits a differential zone transfer request including the serial number of the zone data held by the secondary DNS server system to the primary DNS server. Upon receiving this, the primary DNS server system reads the serial number of the journal file that has not yet been updated from the group of journal files stored on the disk, and updates the journal file corresponding to this serial number (dynamically updated). Domain name and resource data information) is transmitted to the secondary DNS server system. The secondary DNS server system that has received such update information updates the zone data based on the update information.

  Thereafter, the primary DNS server system performs processing for integrating the zone data file and the journal file to update the zone data stored in the disk. Then, after performing such integration processing, the journal file used for integration is deleted.

Paul Vixie, Akira Kato, “Modern DNS as a Consistent Dynamic and General Database”, Science (B) Vol.J87-B No.10pp.1534-1541 Paul Albitz, Cricket Liu, translated by Mitsumasa Kodate, “DNS & BIND 4th Edition”, P.M. 323-P. 326, O'Reilly Japan

  Incidentally, as described below, the above-described conventional technique has a problem that the processing load for updating the zone data in the disks of the primary DNS server system and the secondary DNS server system is large and the processing speed is slow. It was.

  That is, in order to update the zone data of the secondary DNS server system described above, the journal file stored in the disk of the primary DNS server system is read, so that the processing load is larger and the processing speed is higher than reading the memory. There was a problem of being slow.

  In addition, since the process of integrating the zone data file and the journal file is performed in order to update the original of the primary DNS server system, for example, when there is a lot of information stored in the zone data, a huge file operation is performed. Therefore, there is a problem that the processing load is large and the processing speed is slow.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and a domain information storage device and domain information that can reduce processing load and improve processing speed when updating domain information. It is an object to provide a storage method and a domain information storage program.

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 updates the domain information stored together with the backup device according to the update request from the client device, and responds to the update request. A domain information storage device that transmits created update information to a backup device, wherein the domain information stored in a randomly accessible database is updated in response to an update request from the client device Means, storage means for storing update information created in response to the update request in a memory, and update information transmission means for transmitting the update information stored in the memory to the backup device, To do.

  The invention according to claim 2 further comprises an upper limit setting receiving means for receiving an upper limit setting of the number of cases in the update information stored by the storage means in the above invention, wherein the storage means receives the upper limit setting reception. When the number of cases in the update information received by the means exceeds the upper limit, the update information is deleted.

  According to a third aspect of the present invention, in the above invention, the information determination for determining whether the domain information stored by the backup device is older than the oldest update information stored by the storage means The transmission means further comprises: domain information stored in the database when the determination means determines that the domain information stored in the backup device is older than the oldest update information. Is transmitted.

  The invention according to claim 4 updates the domain information stored together with the backup device in response to an update request from the client device, and transmits the update information created in response to the update request to the backup device. A domain information storage method characterized in that the domain information stored in a randomly accessible database is updated in response to an update request from the client device, and is created in response to the update request A storage step of storing update information in a memory; and an update information transmission step of transmitting update information stored in the memory to the backup device.

  The invention according to claim 5 updates the domain information stored together with the backup device in response to an update request from the client device, and transmits the update information created in response to the update request to the backup device. A domain information storage program for causing a computer to execute a domain information storage method characterized by comprising: updating the domain information stored in a randomly accessible database in response to an update request from the client device; A storage procedure for storing the update information created in response to the update request in a memory and an update information transmission procedure for transmitting the update information stored in the memory to the backup device. To do.

  According to the invention of claim 1, 4 or 5, the domain information stored in the randomly accessible database is updated in response to an update request from the client device, and the update information created in response to the update request is stored in the memory. Since the stored update information is stored and transmitted to the backup device, the integration process of update information with respect to the database becomes unnecessary. As a result, when updating domain information, the processing load can be reduced and the processing speed can be improved. It becomes possible. Further, when reading update information, as a result of accessing the memory, it is possible to reduce the processing load and improve the processing speed compared to accessing the disk.

  Also, according to the invention of claim 2, the setting of the upper limit of the number of cases in the stored update information is accepted, and when the upper limit of the number of cases in the received update information is exceeded, the update information is deleted. As a result of managing the update information with the storage capacity, it is possible to reduce the processing load and improve the processing speed when updating the domain information.

  According to the invention of claim 3, it is determined whether or not the domain information stored by the backup device is older than the oldest update information stored, and the domain information stored by the backup device is If the update information is older than the oldest update information, the domain information stored in the database is transmitted. For example, when a new backup device is started, the domain information stored in the database is transmitted to the backup device. As a result, new domain information can be transmitted to the backup device without storing all update information in the memory.

  Exemplary embodiments of a domain information storage device, a domain information storage method, and a domain information storage program according to the present invention will be described below in detail with reference to the accompanying drawings. The primary DNS server system device, which is a domain information storage device, will be described as a first embodiment, and then another embodiment included in the present invention will be described as a second embodiment.

  In the following embodiment, the outline and features of the primary DNS server system apparatus according to the first embodiment, the configuration of the primary DNS server system apparatus and the flow of processing will be described in order, and finally the effects of the first embodiment will be described.

[Outline and Features of Primary DNS Server System Device]
First, the outline and features of the primary DNS server system apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline and features of the primary DNS server system apparatus according to the first embodiment.

  In the primary DNS server system device 1 according to the first embodiment, the domain information stored together with the backup device is updated according to the update request from the client device, and the update information created according to the update request is transmitted to the backup device. Is a summary. The primary DNS server system apparatus 1 is mainly characterized in that the processing load can be reduced and the processing speed can be improved when updating the domain information.

  The main features will be specifically described. As shown in FIG. 1, the primary DNS server system apparatus 1 includes a database 14 and a memory (dynamic update information table) 16. The database 14 is a randomly accessible database, and stores zone data (corresponding to “domain information” in the claims), which is information in which domain names are associated with resource data. The memory 16 also includes a memory journal (“update information” in the claims) containing the contents of the zone data dynamic update (zone data registration, deletion or change) received from the DNS dynamic update client device 3. Is stored in memory.

  When the primary DNS server system apparatus 1 receives dynamic update request information for requesting dynamic update of zone data from the DNS dynamic update client apparatus 3 (see (1) in FIG. 1), this dynamic update is performed. Reflecting the request information, the zone data stored in the database 14 is updated (see (2) in the figure), and a memory journal composed of dynamically updated information is stored in the memory 16 (( 3)). To give a specific example, the primary DNS server system device 1 dynamically registers the domain name “ghi.sample.co.jp” and the corresponding resource data “192.168.0.3”. When the update request information is received, the serial number “102” obtained by adding “1” to the previously assigned serial number “101” is added, the domain name “ghi.sample.co.jp”, the resource data “ The memory journal including “192.168.0.3” and the update content “registration” is stored in the memory 16.

  Thereafter, the primary DNS server system device 1 transmits an update notification message indicating that the zone data has been updated to the secondary DNS server system 2 (see (4) in the figure). On the other hand, the secondary DNS server system device 2 that has received such an update notification message transmits, to the primary DNS server system device 1, a differential zone transfer including the serial number of the zone data held by the secondary DNS server system device 2. The request is transmitted (see (5) in the figure). In the above example, a differential zone transfer request including the serial number “101” of the zone data stored in the memory is transmitted.

  Then, the primary DNS server system device 1 reads out the serial number of the memory journal that has not been updated from the memory journal group stored in the memory 16 to the secondary DNS server system device 2, and corresponds to this serial number. Memory journal update information (dynamically updated domain name and resource data information) is transmitted as a differential zone transfer response message to the secondary DNS server system (see (6) in FIG. 6). In the above example, update information related to the serial number “102” that is newer than the serial number “101” is acquired from the memory 16, and this update information is transmitted to the secondary DNS server system.

  Thereafter, the secondary DNS server system device 2 that has received the differential zone transfer response data updates the zone data by using the differential zone transfer response data (see (7) in the figure). In the above example, the zone data is updated based on the update information related to the serial number “102”.

  As described above, according to the first embodiment, the zone data stored in the randomly accessible database 14 is updated according to the dynamic update request from the DNS dynamic update client device 3, and is generated according to the update request. The memory journal is stored in the memory 16 and the memory journal stored in the memory 16 is transmitted to the secondary DNS server system device 2, so that the integration process of the update information for the database 14 becomes unnecessary. As a result, the zone data (domain When updating (information), the processing load can be reduced and the processing speed can be improved. Also, when reading the memory journal, as a result of accessing the memory 16, it is possible to reduce the processing load and improve the processing speed compared to accessing the disk.

[Configuration of primary DNS server system]
Next, the system configuration of the DNS server system apparatus shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a configuration diagram illustrating a system configuration of the DNS server system apparatus according to the first embodiment. As shown in the figure, this DNS server system includes a primary DNS server system device 1, a secondary DNS server system device 2, a DNS dynamic update client device 3, and a DNS client device 4, each of which has an Internet 5 Connected through.

  Further, the primary DNS server system apparatus 1 includes a DNS dynamic update processing unit 11, a zone transfer processing unit 12, a database management unit 13, a database 14, a memory journal management unit 15, a memory journal 16, and a memory journal. An upper limit number holding unit 17, a DNS query processing unit 18, a memory space zone data management unit 19, and memory space zone data 20 are provided.

  Among these, the database 14 is a randomly accessible database, and as shown in FIG. 3, zone data, which is information in which domain names are associated with resource data, is stored in the zone data table 14a.

  The memory 16 is a high-speed temporary storage device, and includes the contents of zone data dynamic update (zone data registration, deletion or change) received from the DNS dynamic update client device 3, as shown in FIG. The memory journal is stored in the dynamic update information table.

  The memory space zone data 20 is a table that stores the same contents as the zone data table 14a of the database 14, and is referred to when a query request is described later.

  The memory journal upper limit number holding unit 17 is a means for holding the upper limit number of memory journals stored in the memory 16 for each zone. This upper limit number is set by the user or the like.

  The DNS query processing unit 18 is a processing unit that processes a query request (a query request for a domain name and resource data) from the DNS client device 4. Specifically, when there is a query request from the DNS client device 4, the zone data is read from the memory space zone data 20 via the memory space zone data management unit 19 to query the domain name and resource data. To send a query result for such a query request.

  The memory space zone data management unit 19 is a processing unit that registers, deletes, updates, and inquires the zone data of the memory space zone data 20.

  The DNS dynamic update processing unit 11 is a processing unit that transmits / receives predetermined information to / from the DNS dynamic update client device 3 via the network 5. Specifically, a process of receiving a dynamic update request from the DNS dynamic update client apparatus 3, a DNS dynamic update response message indicating that the zone data has been updated when the zone data in the database 14 is updated Is transmitted to the DNS dynamic client device 3.

  The database management unit 13 is a processing unit that manages, deletes, updates, and inquires zone data in the database 14. Specifically, when the DNS dynamic update processing unit 11 receives a dynamic update request from the DNS dynamic update client device 3, the zone data in the database 14 is updated based on the dynamic update request. In other words, for example, when a dynamic update request for registering the domain name “ghi.sample.co.jp” and the corresponding resource data “192.168.0.3” is received, Domain information in which the domain name “ghi.sample.co.jp” is associated with the resource data “192.168.0.3” is newly stored in the database 14 (see FIG. 3). The database management unit 13 corresponds to “update means” described in the claims.

  The memory journal management unit 15 is a processing unit that performs registration, deletion, and inquiry of the memory journal in the memory 16. Specifically, when the zone data in the database 14 is updated by the database management unit 13, a memory journal including the dynamically updated information is stored in the memory 16. That is, for example, when the domain name “ghi.sample.co.jp” and the resource data “192.168.0.3” are registered in the database 14 in association with each other, the serial number attached last time is used. The serial number “102” obtained by adding “1” to the number “101” is assigned, and the domain name “ghi.sample.co.jp”, the resource data “192.168.0.3”, and the update content “registration” Is stored in the memory 16 (see FIG. 4). The memory journal management unit 15 corresponds to a “storage unit” described in the claims.

  Further, the memory journal management unit 15 obtains the number of memory journals currently registered from the memory 16 prior to the memory journal registration described above, and stores the obtained number in the memory journal upper limit number holding unit 17. Processing for determining whether or not the number is less than the upper limit number, and processing for deleting the oldest memory journal from the memory 16 when the number is equal to or greater than the upper limit number are also performed.

  The zone transfer processing unit 12 is a processing unit that performs processing related to update of zone data in the secondary DNS server system device 2. Specifically, when the zone data in the database 14 is updated, a process of transmitting an update notification message indicating that the zone data has been updated to the secondary DNS server system device 2, and responding to this update notification message Processing for receiving a difference zone transfer request message (message including the serial number of the zone data held by the secondary DNS server system device 2) from the secondary DNS server system device 2, and the oldest and latest registered in the memory 16 A process of acquiring the serial number of the memory journal from the memory 16 and a process of determining whether or not the serial number included in the difference zone transfer request message is greater than or equal to the oldest serial number acquired from the memory 16 are performed.

  Further, the zone transfer processing unit 12 is still updated from the memory journal group stored in the memory 16 when the serial number of the difference zone transfer request message is greater than or equal to the oldest serial number in the memory 16. The memory journal update number (dynamically updated domain name and resource data information) as a differential zone transfer response message to the secondary DNS server system 2 Process to send. For example, in the above example, update information related to the serial number “102” that is newer than the serial number “101” is acquired from the memory 16, and this update information is transmitted to the secondary DNS server system.

  Further, when the serial number of the difference zone transfer request message is smaller than the numerical value of the oldest serial number in the memory 16, the zone transfer processing unit 12 sends a difference zone transfer error response indicating that the difference zone transfer cannot be performed. Processing to be transmitted to the secondary DNS server system 2, and a response indicating this differential zone transfer error response from the secondary DNS server system device 2 a complete zone transfer request message (a message indicating that a complete zone transfer is requested instead of a differential zone transfer) ), A process of reading all zone data from the database 14, a process of transmitting a complete zone transfer response message composed of the zone data to the secondary DNS server system 2, and the like.

[Processing by primary DNS server system apparatus]
Next, the process by the primary DNS server system apparatus 1 is demonstrated using FIG. FIG. 5 is a flowchart illustrating a process flow of the primary DNS server system apparatus 1 according to the first embodiment.

  As shown in the figure, when the primary DNS server system apparatus 1 receives a dynamic update request from the DNS dynamic update client apparatus 3 in the DNS dynamic update processing section 11 (step S1), the database management section 13 Based on the dynamic update request, the zone data in the database 14 is updated (step S2). In other words, for example, when a dynamic update request for registering the domain name “ghi.sample.co.jp” and the corresponding resource data “192.168.0.3” is received, Domain information in which the domain name “ghi.sample.co.jp” is associated with the resource data “192.168.0.3” is newly stored in the database 14.

  Subsequently, the memory journal management unit 15 acquires the number of memory journals currently registered from the memory 16 (step S3), and the acquired number is smaller than the upper limit number stored in the memory journal upper limit number holding unit 17. Is determined (step S4). If this is equal to or greater than the upper limit number (No at step S4), only one oldest memory journal is deleted from the memory 16 (step S5).

  Then, following this deletion process, or when the acquired number is not less than the upper limit number stored in the memory journal upper limit number holding unit 17 (Yes in step S4), the memory journal management unit 15 performs the above step. A memory journal composed of the information dynamically updated in S2 is registered in the memory 16 (step S6). That is, for example, when the domain name “ghi.sample.co.jp” and the resource data “192.168.0.3” are registered in the database 14 in association with each other, the serial number attached last time is used. The serial number “102” obtained by adding “1” to the number “101” is assigned, and the domain name “ghi.sample.co.jp”, the resource data “192.168.0.3”, and the update content “registration” Is registered in the memory 16.

  Thereafter, the DNS dynamic update processing unit 11 transmits a DNS dynamic update response message indicating that the zone data has been updated to the DNS dynamic client device 3 via the network 5 (step S7). Then, the zone transfer processing unit 12 transmits an update notification message indicating that the zone data has been updated to the secondary DNS server system device 2 (step S8), and the secondary DNS server system device responding to the update notification message. 2 receives a difference zone transfer request message (a message including the serial number of the zone data held by the secondary DNS server system device 2) (step S9), the oldest and latest memory journals registered in the memory 16 are stored. A serial number is acquired from the memory 16 (step S10), and it is determined whether or not the serial number included in the difference zone transfer request message is greater than or equal to the oldest serial number acquired from the memory 16 (step S11).

  Here, when the serial number of the difference zone transfer request message is greater than or equal to the oldest serial number in the memory 16 (Yes in step S11), the zone transfer processing unit 12 stores the difference zone transfer request message in the memory 16 in the memory 16. The serial number of the memory journal that has not yet been updated is read from the memory journal group (step S16), and the memory journal update information (dynamically updated domain name and resource data information) corresponding to this serial number is differenced. A zone transfer response message is transmitted to the secondary DNS server system 2 (step S17), and the series of processes is terminated. For example, in the above example, update information related to the serial number “102” that is newer than the serial number “101” is acquired from the memory 16, and this update information is transmitted to the secondary DNS server system to perform a series of processing. Exit.

  On the other hand, if the serial number of the difference zone transfer request message is smaller than the oldest serial number in the memory 16 (No in step S11), the zone transfer processing unit 12 indicates that the difference zone transfer cannot be performed. A zone transfer error response is transmitted to the secondary DNS server system 2 (step S12), and a complete zone transfer request message is sent from the secondary DNS server system device 2 to the differential zone transfer error response (the complete zone instead of the differential zone transfer). When a message indicating that transfer is requested is received (step S13), all zone data is read from the database 14 (step S14), and a complete zone transfer response message including the zone data is sent to the secondary DNS server system 2. Send (step S15) and end a series of processing That.

[Effect of Example 1]
As described above, according to the first embodiment, the zone data stored in the randomly accessible database 14 is updated according to the dynamic update request from the DNS dynamic update client device 3, and the update request is satisfied. Since the memory journal created in this manner is stored in the memory 16 and the memory journal stored in the memory 16 is transmitted to the secondary DNS server system device 2, the integration process of the update information for the database 14 becomes unnecessary. When updating (domain information), the processing load can be reduced and the processing speed can be improved. Also, when reading the memory journal, as a result of accessing the memory 16, it is possible to reduce the processing load and improve the processing speed compared to accessing the disk.

  In addition, according to the first embodiment, the setting of the upper limit of the number of cases in the memory journal stored in the memory 16 is accepted, and the memory journal is deleted when the upper limit of the number of cases in the accepted memory journal is exceeded. As a result of managing the memory journal with the storage capacity, it is possible to reduce processing load and improve processing speed when updating zone data. This is not necessarily an essential matter of the present invention, and the memory journal can be stored without setting an upper limit on the number of memory journals stored in the memory 16.

  Further, according to the first embodiment, it is determined whether or not the zone data stored by the secondary DNS server system device 2 is older than the oldest zone data stored, and is stored by the secondary DNS server system device 2. If the zone data being stored is older than the oldest zone data, the zone data stored in the database is transmitted. For example, when the secondary DNS server system apparatus 2 is newly started up, it is stored in the database. As a result of transmitting the existing zone data to the secondary DNS server system apparatus 2, new zone data can be transmitted to the secondary DNS server system apparatus 2 without storing all the memory journals in the memory 16.

  The embodiments of the present invention have been described so far, but the present invention will be described as various embodiments other than the above-described embodiments.

(1) System configuration etc. In addition, among the processes described in the present embodiment, all or part of the processes described as being automatically performed can be manually performed or manually performed. All or a part of the processing described as a thing can also be automatically performed by a known method. In addition, the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above-described document and drawings can be arbitrarily changed unless otherwise specified.

  Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed in each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware by wired logic.

(2) Program By the way, the various processes described in the above embodiments can be realized by executing a program prepared in advance by a computer. In the following, an example of a computer that executes a program having the same function as that of the above-described embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating a computer that executes a domain information recording program.

  As shown in the figure, a computer 100 as a primary DNS server system apparatus is configured by connecting an HDD 110, a RAM 120, a ROM 130, and a CPU 140 via a bus.

  The ROM 130 stores a domain information recording program that exhibits the same function as that of the above-described embodiment, that is, as shown in FIG. 6, a DNS information dynamic update processing program 131, a zone transfer processing program 132, and a database management program 133. The memory journal management program 134, the memory journal upper limit number holding program 135, the DNS query processing program 136, and the memory space zone data management program 137 are stored in advance. Note that the programs 131 to 137 may be integrated or distributed as appropriate, similarly to each component of the primary DNS server system apparatus 1 shown in FIG.

  Then, the CPU 140 reads out these programs 131 to 137 from the ROM 130 and executes them, so that each program 131 to 137 has a DNS information dynamic update process 141, a zone transfer process 142, It functions as a database management process 143, a memory journal management process 144, a memory journal upper limit number holding process 145, a DNS query processing process 146, and a memory space zone data management process 147. Each of the processes 141 to 147 includes the DNS information dynamic update processing unit 11, the zone transfer processing unit 12, the database management unit 13, the memory journal management unit 14, the memory journal upper limit number holding unit 15, and the DNS query processing unit illustrated in FIG. 2. 16 and the memory space zone data management unit 17 respectively.

  Further, as shown in FIG. 6, the HDD 110 is provided with a zone data table 111 and a memory journal table. The zone data table 111 and the memory journal table 112 correspond to the memory space zone data 20 and the memory journal 16 shown in FIG. Then, the CPU 120 registers the calculation result for the zone data 121 and the memory journal 122, reads the zone data 121 and the memory journal 122 from the zone data table 111 and the memory journal table, stores them in the RAM 120, and stores them in the RAM 120. Based on the zone data 121 and the memory journal 122, processing for managing calculation result data is executed.

  As described above, the domain information storage device, the domain information storage method, and the domain information storage program according to the present invention update the domain information stored together with the backup device in response to an update request from the client device, and It is useful for transmitting update information created in response to a request to a backup device, and is particularly suitable for reducing the processing load and improving the processing speed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an overview and characteristics of a primary DNS server system apparatus according to a first embodiment. 1 is a configuration diagram illustrating a system configuration of a DNS server system apparatus according to Embodiment 1. FIG. It is a figure which shows an example of a zone data table. It is a figure which shows an example of a dynamic update information table. 3 is a flowchart illustrating a processing flow of the primary DNS server system apparatus 1 according to the first embodiment. It is a figure which shows the computer which performs a domain information storage program.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary DNS server system apparatus 2 Secondary DNS server system apparatus 3 DNS dynamic update client apparatus 4 DNS client apparatus 5 Network 11 DNS dynamic update process part 12 Zone transfer process part 13 Database management part 14 Database 15 Memory journal management part 16 Memory Journal 17 Memory journal upper limit number holding unit 18 DNS query processing unit 19 Memory space zone data management unit 20 Memory space zone data

Claims (5)

A domain information storage device characterized by updating domain information stored together with a backup device in response to an update request from a client device, and transmitting update information created in response to the update request to the backup device. And
Updating means for updating the domain information stored in a randomly accessible database in response to an update request from the client device;
Storage means for storing update information created in response to the update request in a memory;
Update information transmitting means for transmitting update information stored in the memory to the backup device;
A domain information storage device comprising: Further comprising upper limit setting accepting means for accepting setting of the upper limit of the number of cases in the update information stored by the storage means,
The domain information storage device according to claim 1, wherein the storage unit deletes the update information when an upper limit of the number of cases in the update information received by the upper limit setting reception unit is exceeded. Information determining means for determining whether the domain information stored by the backup device is older than the oldest update information stored by the storage means;
The transmitting unit transmits the domain information stored in the database when the determining unit determines that the domain information stored in the backup device is older than the oldest update information. The domain information storage device according to claim 1, wherein the domain information storage device is a domain information storage device. A domain information storage method characterized by updating domain information stored with a backup device in response to an update request from a client device, and transmitting update information created in response to the update request to the backup device. And
An update step of updating the domain information stored in a randomly accessible database in response to an update request from the client device;
A storage step of storing update information created in response to the update request in a memory;
An update information transmission step of transmitting update information stored in the memory to the backup device;
A domain information storage method comprising: A domain information storage method characterized by updating domain information stored together with a backup device in response to an update request from a client device, and transmitting update information created in response to the update request to the backup device A domain information storage program to be executed by
An update procedure for updating the domain information stored in a randomly accessible database in response to an update request from the client device;
A storage procedure for storing, in a memory, update information created in response to the update request;
An update information transmission procedure for transmitting update information stored in the memory to the backup device;
A domain information storage program that causes a computer to execute.

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