JPH0363738A - Exchange system recovering method - Google Patents

Abstract

PURPOSE:To easily return to a filing state, which is obtained just before an emergent condition is generated, regardless of a program version by keeping a command, which is inputted from a maintenance terminal while an exchange system is operated, for changing a program and a data base while holding an input command form, and executing the commands when the system is restored. CONSTITUTION:The change command, which is inputted from a maintenance terminal 1 while the exchange is operated, to one of the program and data base at least is kept in the state of the input command form and after the operation is restarted, the kept change command in the input command form is executed. Then, transform systems 2 and 5 are recovered to the state just before the emergent condition is generated. The change command inputted from the maintenance terminal 1 is once saved in a main storage device 3 in the state of the input command system and possibility for executing the change command is decided. Afterwards, the change command is transferred from the main storage device 3 to an external storing medium 4. Thus, even between various program versions, when a main controller 2 executes the change command kept in the external storage device 4 after the emergent condition is recovered and operation is restarted, roll forward processing can be executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a switching system recovery method.

[Conventional technology]

In the conventional switching system recovery method, programs and databases that have been changed during the operation of the switching system are stored and managed in a physical state as address information to be changed for system recovery purposes.

[Problem to be solved by the invention]

In the conventional exchange system recovery method described above, roll forward (a method of compensating for the difference in program and database changes to the exchange operation file that was changed between the time when the exchange operation file was backed up and the occurrence of an emergency situation) is performed. Therefore, the database that stores the differences in changes to the operational files is exclusive to that program version, so there is a problem that there is no compatibility between different program versions.

[Means to solve the problem]

The present invention provides that when an emergency situation occurs in an exchange system having a function of regularly backing up programs and databases on a main storage device to an external storage medium, the programs and databases backed up to the external storage medium are transferred to the main storage device. In the exchange system recovery method of loading the exchange system into the device and restarting the exchange system operation, a change command for at least one of the program and the database input from the maintenance terminal during the exchange operation is saved in an input command format, and after the operation is resumed. The configuration is such that the change command in the saved input command format is executed to restore the exchange system to the state immediately before the emergency situation occurred.

Further, in the exchange system recovery method of the present invention, the change command inputted from the maintenance terminal is temporarily saved in the main storage device in an input command format, and after determining whether or not the change command can be executed, The method includes a process of transferring the change command from the main storage device to the external storage medium.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Fig. 1 is a configuration diagram showing an example of an exchange system to which the present invention is applied, and Fig. 2 shows the flow of processing in one embodiment. Used for command input.

The main storage device 2 includes an area for temporarily storing change commands input from the maintenance terminal 1 in a command format. The secondary storage device 3 semi-permanently stores the command format change instruction temporarily stored in the main storage device 2 for roll-forward purposes. The maintenance terminal 1, the main storage device 2, and the secondary storage device 3 are controlled by the main controller 4. network 5
accommodates subscriber terminals, etc.

If the change command input from the maintenance terminal 1 while the exchange system with this configuration is in operation is a command to be rolled forward, that is, a command to change the database and program (S↓>, this change command will be input to the input command image Temporarily save it to main storage device 2 (S2
〉.

Next, the main controller 4 determines whether or not the saved change command can be executed (checks the normality of the input command format).
S3>, if executable, the change command saved in the main storage device 2 is transferred to the secondary storage device 3 in the form of an input command image and stored therein (S4). When the main controller 4 executes the change command stored in the secondary storage device 3 after the emergency situation is restored and operations are resumed, rollforward processing can be performed.

〔Effect of the invention〕

As explained above, according to the present invention, program and database change commands input from a maintenance terminal during operation of the exchange system are saved in the input command format, and the saved program and database are changed when the system is restarted. By executing the target command, it is possible to easily return to the file state immediately before the emergency situation occurred, regardless of the program version.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Maintenance terminal, 2... Main storage device, 3... Sub storage device, 4... Main control device.

Claims (2)

[Claims] (1) When an emergency situation occurs in an exchange system that has the function of periodically backing up programs and databases on the main storage device to an external storage medium, the programs and databases backed up to the external storage medium are transferred to the main storage device. In the exchange system recovery method of loading the exchange system into the device and restarting the exchange system operation, a change command for at least one of the program and the database input from the maintenance terminal during the exchange operation is saved in an input command format, and after the operation is resumed. An exchange system recovery method, characterized in that the exchange command is executed in a stored input command format to restore the exchange system to the state immediately before the emergency situation occurred. (2) temporarily saving the change command input from the maintenance terminal in the input command format in the main storage device;
2. The exchange system recovery method according to claim 1, further comprising a process of transferring the change command from the main storage device to the external storage medium after determining whether or not the change command can be executed.