JPH07160637A - Operation command issuing method for on-line system - Google Patents

Abstract

PURPOSE:To provide an operation command issuing method which can change processes to analyze the contents of commands when a process fault occurs in an on-line system where plural computer systems are connected via a communication line. CONSTITUTION:The computer systems 11 and 12 are provided with a DB 111 and a DB 112, an OS 1B and an OS 1C, the application programs AP 112-114 and 122-125, and the on-line transaction processing programs 17 and 18 which include the system managers 19 and 1A to analyze and process the contents of the commands issued from those application programs. When a process fault occurs, the monitor means included in the program 17 and 18 check the presence or absence of the processes having the same functions in the same computer system. If such processes exist, the faulty process is replaced with a nondefective process of the same function. If not exist, the states of processes of another computer system are checked and the faulty process is replaced with another nondefective process of the same function if available. If not variable, a new process is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation command issuing method in an online system in which a plurality of computer systems are connected via a communication line, and is particularly suitable for an online system requiring high performance and high reliability. A method for issuing various operation commands.

[0002]

2. Description of the Related Art Generally, a computer system uses an operation command in order to grasp, manage and control the operation status of the system. The operation command is input from a console device, a system management terminal, a general terminal, or the like.

As a conventional method of issuing an operation command of an online system, for example, "Program Product V
OS3 Data Management System XDM E2 Series Operation Guide Fourth Edition "(Hitachi, September 1991)
The method described on page 333, page 336 is known. In this method, the application program directly requests the operating system to issue an operation command. An application program monitors the occurrence status of system failures.

[0004]

The above-mentioned prior art does not consider performing online processing in a plurality of computer systems, and services such as issuance of operation commands cannot be continued at the time of failure, resulting in performance and reliability problems. Was not secured, and there was a problem that it hindered online operations.

An object of the present invention is to solve the above problems of the prior art and to provide a means for performing replacement processing in the event of a failure in a system for performing online processing by a plurality of computer systems, thereby continuing the operation command issuing service. It is to provide a method of issuing an operation command of an online system that can be performed by the following.

[0006]

In order to achieve the above object, the present invention is an online system comprising a plurality of computer systems connected via a communication line, wherein each computer system performs processing by a plurality of processes. It has an application program and an online transaction processing program that manages the generation and termination of transactions. The online transaction processing program receives the operation command issue request of each application program, analyzes the contents of this command, and executes the issue processing. It is configured to go and pass the result to any process.

Further, the online transaction processing program has means for monitoring whether or not the process on the own computer system is normal, and when the process for analyzing the contents of the command and issuing the command fails. The process is continued by another process that provides the same function on its own computer or another computer, and when no process exists, a process that provides the same function is newly created.

As a concrete example, each online transaction processing program searches for an operation command to be issued from a directory defined by the user, issues the operation command using the system operating system call of the UNIX operating system, and then outputs the pipe operation of the UNIX operating system. The output information of the operation command is returned using the system call.

[0009]

The operation based on the above configuration will be described.

According to the present invention, in addition to the application program, an online transaction processing program having a function of newly analyzing and processing the contents of the operation command is additionally provided in each computer system, and the operation command is
Issued under the supervision of this online transaction processing program. This makes it possible to recognize that the operation command has been issued. Further, the online transaction processing program is connected between computer systems via a communication line, and can communicate with each other. As a result, it is possible to issue operation commands that span a plurality of computer systems.

Further, since the online transaction processing program of each computer system has a function of monitoring the state of the process, when the process (system manager) that analyzes and processes the contents of the command fails, the same computer system can be used. Check if there is another process that has the function of, and if it exists, switch to that process to continue the service, and if it does not exist, check the process status of the other computer system, and provide the same function on the other computer system. If there is a process to be performed, it can be replaced with that process to continue the service, and if it does not exist, a new process can be started up (created). Therefore, as seen from the application program side, it is possible to automatically continue issuing commands without being aware of the operation command request destination.

It should be noted that each application program can issue an operating command of the operating system, an operating command of the online transaction processing program, and a command of the user in the same process (without being aware of it) (FIG. 2). , Fig. 3).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an online processing system to which the present invention is applied. The online processing system includes computer systems 11 and 12 connected via a communication line 13, terminal systems 14, 15 and 16 connected to the computer system 11, and a computer system 1.
It is composed of databases 111 and 121 connected to 1 and 12. The computer system 11 has application programs 112, 113, 114 and an online transaction processing program 17 for managing the generation and termination of transactions newly provided in the present embodiment. The computer system 12 has application programs 122, 123. , 124, 125 and an online transaction processing program 18 newly provided in the present embodiment. System managers 19 and 1A
Online transaction processing programs 17, 18
Is a program that analyzes and processes the contents of the command of the own computer system. These programs operate under the operating systems 1B and 1C. One transaction is activated by the data input from the terminal system and the application program is executed. If this application program involves referring / updating the database in the local computer system, access the database through the online transaction processing program, otherwise, access the database in the other computer system through the communication line. To access. After that, the online transaction processing program updates synchronously, returns the result to the terminal system, and one transaction is completed.

FIG. 2 shows a flow chart of an operation command issuing method according to an embodiment of the present invention. When issuing the operation command from the application program, the application program requests the system manager to issue the operation command (process 20). When the system manager receives the command issuance request (process 21), it creates a pipe for storing standard output information and standard error output information by using the pipe system call of the UNIX operating system (modern modern OS) (process). 22) Causes the shell (command execution function peculiar to the UNIX operating system) to execute the command using the system operating system call of the UNIX operating system (process 23). If the command issued by the application program is a command other than the operation command of the online transaction processing program (the operation command created by the transaction processing program itself), for example, the operation command of the operating system or the command of the user, the user beforehand Check whether the command exists in the defined directory and issue the command. Then, the standard output information and the standard error output information stored in the pipe are read into the area designated by the application program (process 24, process 25), and the pipe created in process 22 is deleted (process 26). The execution result is reported as output information to the application program (process 27). The application program receives the command execution result report of the system manager and recognizes the command execution result (process 28). The application program that receives the result report in process 28 may be the same as or different from the application program requesting the operation command in process 20.

FIG. 3 shows the contents of the data format passed when the operation command is issued according to the embodiment of the present invention. In process 20, the application program stores the character string 31 indicating the operation command to be issued. Also, standard output information 33 and standard error output information 35
Is secured, the size (length) 34 of the standard output information 33 and the size (length) 36 of the standard error output information 35 are stored, and these are passed to the system manager. The system manager stores the result of the process 23 in the shell exit code 32, the command execution result in the standard output information 33 and the standard error output information 35, and stores the size 34 of the standard output information 33 and the standard error output information 35. Together with the size 36, these are passed to the application program in process 27.

FIG. 4 is a flow chart of the replacement process performed by the system manager according to the embodiment of the present invention. When a failure occurs in the process that analyzes and processes the content of the command (processing 40), the online transaction processing program detects the failure occurrence of that process (processing 41), and a process having the same function exists in the same computer system. Whether or not to do so is checked (process 42), and if there is a process having the same function, a service request is made to that process and the process is continued (process 43). If there is no process having the same function in the same computer system, the online transaction processing program in the other computer system is inquired about the existence of the process having the same function through the communication line 13 (process 44). Here, if there is a process having the same function, a service request is made to the process (process 45). If there is no process having the same function in the other computer system, the process is newly started in the own computer system (process 46). Processing is started by this started process to continue the service (processing 47).

[0018]

As described above, according to the present invention,
An online transaction processing program that analyzes and processes the contents of commands is attached to each computer system connected by a communication line, and operation commands are issued under the supervision of this online transaction processing program. It is possible to obtain the effect that the operation command can be issued by using an arbitrary process across the computer systems.

Further, when a failure occurs in the process for analyzing and processing the contents of the command, the command issue processing service is made to continue by replacing it with an arbitrary process having the same function in a plurality of computer systems. It is possible to obtain and maintain high performance without lowering the service amount per hour, and to obtain high reliability by continuing the service.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of an online processing system to which the present invention is applied.

FIG. 2 is a flowchart showing a processing procedure of an operation command issuing method according to an embodiment of the present invention.

FIG. 3 is a diagram showing contents of a data format passed when an operation command is issued according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a processing procedure of a replacement process according to an embodiment of the present invention.

[Explanation of symbols]

1A System manager 1B, 1C Operating system 11, 12 Computer system 13 Communication line 14, 15, 16 Terminal system 17, 18 Online transaction processing program 19 System manager 111, 121 Database 112, 113, 114, 122, 123, 124, 1
25 Application Program

Claims (2)

[Claims] 1. An online system comprising a plurality of computer systems connected via a communication line, wherein each computer system has an application program for processing by a plurality of processes and an online transaction processing for managing the generation and termination of transactions. The online transaction processing program is configured to receive an operation command issuance request of each application program, analyze the contents of this command, perform the issuing process, and pass the result to an arbitrary process. A method for issuing operation commands for an online system characterized by: 2. The online transaction processing program comprises means for monitoring whether or not a process on a local computer system is normal, and when a failure occurs in a process which analyzes the contents of the command and issues the command. ,
It is characterized in that processing is continued by another process that provides the same function on its own computer or on another computer, and when no process exists, a process that provides the same function is newly created. The method for issuing an operation command for an online system according to claim 1.