摘要:
Provided is a data replication method capable of reducing the number of communication times when a processing result of an active system is replicated to a standby system. The data replication method, in which a first computer receives a first message containing a first processing request, and a plurality of second computers replicates the first message, includes the steps of: sending, by a third computer, the first message to the first computer and the second computers; sending, by each of the second computers, a message receive notification of the first message to the first computer; sending, by the first computer, after reception of the message receive notification from the second computers, the message receive notification of the first message to the third computer; and sending, by the first computer, a notification indicating that the first processing request becomes executable by the first computer to the second computers.
摘要:
Provided is a data replication method capable of reducing the number of communication times when a processing result of an active system is replicated to a standby system. The data replication method, in which a first computer receives a first message containing a first processing request, and a plurality of second computers replicates the first message, includes the steps of: sending, by a third computer, the first message to the first computer and the second computers; sending, by each of the second computers, a message receive notification of the first message to the first computer; sending, by the first computer, after reception of the message receive notification from the second computers, the message receive notification of the first message to the third computer; and sending, by the first computer, a notification indicating that the first processing request becomes executable by the first computer to the second computers.
摘要:
There is provided a method of adding a new computer as a standby computer to a computer system that includes an active computer for performing service processing and a standby computer for storing replica of data stored in the active computer. The replica of the data stored in the standby computer is updated when the data stored in the active computer is updated. The method comprising the steps of: selecting the standby computer from the computer system; transferring the replica of the data stored in the selected standby computer to the new computer; and transferring update information on data updated in the active computer after the transferring the replica of the data is started, to the new computer.
摘要:
There is provided a method of adding a new computer as a standby computer to a computer system that includes an active computer for performing service processing and a standby computer for storing replica of data stored in the active computer. The replica of the data stored in the standby computer is updated when the data stored in the active computer is updated. The method comprising the steps of: selecting the standby computer from the computer system; transferring the replica of the data stored in the selected standby computer to the new computer; and transferring update information on data updated in the active computer after the transferring the replica of the data is started, to the new computer.
摘要:
The message delivery system has a first and a second computer and a storage device. The first computer receives messages sent from a sender, delivers the messages to at least a part of receiver computers and gets states of message delivery to these receiver computers. Based on the message delivery states, a check is made as to whether there are any slow receiver computers that have the message delivery thereto delayed. When there are slow receiver computers, a request is made to switch a message delivery control over the detected slow receiver computers from the first computer to the second computer. Then the second computer takes over the message delivery control over the slow receiver computers and resumes delivering the messages to the slow receiver computers.
摘要:
Provided is a method of changing the configuration of a shared-nothing database system without shutting down the system. The configuration changing method for a shared-nothing database system includes plural database servers, a storage which provides data areas to the database servers, and a management server which has a database management system and divides a transaction to allocate pieces of the transaction to the database servers, and the configuration changing method allows no two of the database servers to access the same data area. The configuration changing method changes the configurations of the database servers by specifying which data area is to be reallocated, judging whether or not the specified data area can be reallocated, and reallocating the specified data area without shutting down the database management system when it is judged that the specified data area can be reallocated.
摘要:
To realize a degraded operation for equalizing loads on servers to prevent performance from being degraded in a server system having a cluster configuration in which a node in which an error occurs is excluded. The server system includes a plurality of DB servers for dividing a transaction of a database processing for execution, a storage system including a preset data area and a preset log area that are accessed by the server, and a management server for managing the transaction to be allocated to the plurality of DB servers. A data area and a log area used by the DB server with the error among the plurality of DB servers are designated, and the data area accessed by the DB server with the error is recovered in the log area accessed by the server with the error.
摘要:
Provided is a method of changing the configuration of a shared-nothing database system without shutting down the system. The configuration changing method for a shared-nothing database system includes plural database servers, a storage which provides data areas to the database servers, and a management server which has a database management system and divides a transaction to allocate pieces of the transaction to the database servers, and the configuration changing method allows no two of the database servers to access the same data area. The configuration changing method changes the configurations of the database servers by specifying which data area is to be reallocated, judging whether or not the specified data area can be reallocated, and reallocating the specified data area without shutting down the database management system when it is judged that the specified data area can be reallocated.
摘要:
There is provided a method executed in a cluster system comprising a first computer and at least one second computer that stores the data transmitted from the first computer. The method comprising the steps of: judging whether the failure-occurred processing is restarted by the first computer or the failure-occurred processing is switched over by the second computer based on the system information; receiving the stored data from the second computer and re-executing the processing in which the failure has occurred by the first computer, in the case of which it is judged that the processing in which the failure has occurred is restarted by the first computer; and executing, by the second computer, the processing in which the failure has occurred, in the case of which it is judged that the processing in which the failure has occurred is switched over by the at least one second computer.
摘要:
There is provided a method executed in a cluster system comprising a first computer and at least one second computer that stores the data transmitted from the first computer. The method comprising the steps of: judging whether the failure-occurred processing is restarted by the first computer or the failure-occurred processing is switched over by the second computer based on the system information; receiving the stored data from the second computer and re-executing the processing in which the failure has occurred by the first computer, in the case of which it is judged that the processing in which the failure has occurred is restarted by the first computer; and executing, by the second computer, the processing in which the failure has occurred, in the case of which it is judged that the processing in which the failure has occurred is switched over by the at least one second computer.