JP2812274B2 - Transaction load balancing system for loosely coupled multi-computer systems - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transaction processing system in a loosely-coupled multi-computer system, and more particularly to a transaction processing system in a loosely-coupled multi-computer system in which transaction processing systems for processing messages having different message formats are mixed. The present invention relates to a transaction load distribution system in a loosely coupled multi-computer system for realizing distribution.

[0001]

2. Description of the Related Art In a transaction processing load distribution method described in Japanese Patent Application Laid-Open No. 63-318662, several sub-transaction processing systems that share a database and perform transaction processing in a distributed manner use a shared memory device. The shared memory device further includes an input transaction processing queue shared by each transaction processing system, and an output message queue corresponding to each transaction processing system.

In this conventional transaction processing load distribution method, a transaction received by each transaction processing system is registered in an input transaction processing queue, and each transaction processing system executes the next transaction every time one transaction processing is completed. Take out from the input transaction processing queue and perform processing. In this way, the load of each transaction processing system is equalized and the performance of the online system is improved.

[0003]

In this conventional transaction processing load distribution method, each transaction processing system is unaware of the version of the message format (hereinafter referred to as a protocol) of the message, and all received messages are Transaction processing is performed on the premise that the versions are of the same protocol, and there is a problem that the transaction processing system cannot perform transaction processing on messages of a protocol version different from messages of a protocol version that can be processed by the own transaction processing system. .

[0004] For this reason, the conventional transaction processing load distribution method has a problem that a transaction for a message of a different protocol version input from a terminal cannot be processed in a loosely coupled multi-computer system by load distribution. .

[0005] It is an object of the present invention to provide transaction processing for messages with different protocol versions.
It is an object of the present invention to allow a transaction processing system of each host constituting a loosely-coupled multiple computer system to execute the distributed processing.

Another object of the present invention is to enable, even if a failure occurs in any one of the hosts constituting a loosely coupled multi-computer system, the transaction processing executed on the host to be continued on another host. Is to do so.

Another object of the present invention is to enable a terminal user to input a message and execute a transaction process without being aware of the protocol version.

[0008]

According to a first aspect of the present invention, there is provided a transaction load distribution system in a loosely-coupled multiple computer system, comprising: a plurality of host computers for executing transaction processing; and a message format for executing the transaction processing. In a loosely coupled multiplex computer system including a terminal that transmits to any one of the plurality of host computers via the communication control device and an external storage device shared by the plurality of host computers, the host computer includes: A protocol storage unit for registering a message format of a message capable of executing a transaction process for each of the plurality of host computers; and a self-host computer executing a transaction process at startup of the self-host computer and at regular time intervals. Message format of messages that can be A protocol notifying means for registering in the protocol storing means and notifying the other host computer, and a protocol storing a message format of a message notified from the other host computer that the other host computer can execute a transaction process. A protocol update unit to be registered in the unit, and a message format version that receives a message from the terminal and refers to the protocol storage unit and the message format attached to the message is such that the host computer can execute a transaction process. And when the host computer is not in a high load state, a message processing host determining means for executing a transaction process on the received message is included.

[0009] The transaction load distribution system in the second loosely coupled multi-computer system according to the present invention is the transaction load distribution system in the first loosely coupled multi-computer system, wherein the message processing host judging means further transmits a message from the terminal. If the message format attached to the message is determined not to be a message format in which transaction processing can be executed in the host computer by referring to the protocol storage means, the message is stored in the external storage device. Is stored.

A third aspect of the present invention provides a transaction load distribution system in a loosely coupled multi-processor system, wherein the message processing host determining means further comprises the terminal. From the host computer, determines that the message format attached to the message is a message format capable of executing transaction processing on the host computer, and that the host computer When the status is the status, the message is stored in the external storage device.

A transaction load distribution system in a fourth loosely-coupled multi-computer system according to the present invention comprises: a plurality of host computers for executing transaction processing; In a loosely coupled multiplex computer system including a terminal transmitting to any of the plurality of host computers via a device and an external storage device shared by the plurality of host computers, the host computer includes: A protocol storage unit for registering a message format of a message capable of executing a transaction process in the host computer, and a message of a message enabling the host computer to execute a transaction process when the host computer is started up and at regular time intervals. Format the protocol Protocol notifying means for registering in the storage means and notifying the other host computer, and a message format of a message notified from the other host computer that the other host computer can execute a transaction process to the protocol storing means. A protocol update unit to register, and a message read from the external storage device at the time of completion of transaction processing in the host computer and at regular time intervals, and referring to the protocol storage unit to determine a message format attached to the message. If the host computer is not in a high-load state and has a message format version in which transaction processing can be executed by the host computer, and includes a message processing host determination means for executing transaction processing on the received message. The features.

A fifth aspect of the present invention provides a transaction load distribution system in a loosely-coupled multi-computer system, wherein the message processing host judging means further comprises: At the completion of processing and at regular time intervals, a message is read from the external storage device, and the message format attached to the message is referred to the protocol storage means so that the host computer can execute the transaction processing. If it is determined that the message is not in the format, the message is stored in the external storage device.

In a sixth aspect of the present invention, there is provided a transaction load distribution system in a loosely-coupled multi-computer system. In the transaction load distribution system in the fourth and fifth loosely-coupled multi-computer systems, the message processing host judging means further comprises: A message is read from the external storage device at the time of completion of the transaction processing in the computer and at regular time intervals, and the message format attached to the message is executed in the host computer by referring to the protocol storage means. Is determined to be a message format that can be executed, and if the local host computer is in a high load state,
The message is stored in the external storage device.

A transaction load distribution system in a seventh loosely-coupled multi-computer system according to the present invention includes a plurality of host computers for executing transaction processing, and a communication control device for controlling transmission and reception of messages between the plurality of host computers and terminals. And a loosely coupled multiple computer system having an external storage device shared by the plurality of host computers, wherein the terminal includes a message for causing any of the plurality of host computers to execute a desired transaction process. The external storage device includes a global message queuing file for storing data to be transferred between the plurality of host computers, and the host computer receives the message from the terminal. A message is received via the communication control device. Message transmitting / receiving means, transaction execution processing means for executing transaction processing of a message input from the terminal, and a protocol for registering a message format version of a message capable of executing transaction processing for each of the plurality of host computers. At the time of start-up of the own host computer and at regular time intervals, a storage means and a message format version of a message by which the own host computer can execute a transaction process are registered in the protocol storage means and stored in another host computer. A protocol notifying means for notifying, and a protocol for registering, in the protocol storage means, a message format version of a message notified by the other host computer that the other host computer can execute transaction processing. And Col update means,
A global message queuing file input / output unit for inputting / outputting data to / from the global message queuing file, and requesting another host computer to perform transaction processing of a message input from the terminal; A request for transaction processing, a processing request notifying means for reading out a message stored in the global message queuing file by the global message queuing file input / output means, and inputting from the terminal for each of the plurality of host computers. A host status management table for registering whether the transaction processing for the message cannot be executed or not confirmed or confirmed,
A message format received from the message transmitting / receiving means and the processing request notifying means and having a message format version attached to the message with reference to the protocol storage means is a message format capable of executing transaction processing in the host computer. Version,
When the host computer is not in a high load state and the transaction execution processing means is in an active state, the transaction execution processing means includes a message processing host determination means for executing a transaction processing for a received message by the transaction execution processing means. And

The transaction load balancing system in the eighth loosely coupled multiprocessor system according to the present invention is the transaction load distribution system in the seventh loosely coupled multiprocessor system, wherein the message processing host determining means further comprises the message transmitting and receiving means and Receiving a message from the processing request notifying means, referring to the protocol storage means, a message format version attached to the message is a message format version capable of executing transaction processing in the host computer; and When the own host computer is not in a high load state and the transaction execution processing means is in an inactive state, the message further includes a host processing state table that has been confirmed for the own host computer, and the global message is added. And storing, by the queuing file input and output means to the global message queue file.

In a ninth loosely-coupled multiprocessor system according to the present invention, there is provided a transaction load balancing system according to the seventh and eighth loosely-coupled multiprocessor systems. A message format version received from the transmitting / receiving means and the processing request notifying means, and referring to the protocol storage means, is a message format version attached to the message. If it is determined that there is no message, a host processing status table that has been confirmed for the host computer is further added to the message, and the global message queue is input and output by the global message queuing file input / output means. And storing, in the ring file.

The transaction load distribution system in the tenth loosely-coupled multi-computer system according to the present invention has a seventh configuration.
To the ninth to ninth loosely coupled multiple computer systems, the message processing host determining means further receives a message from the message transmitting / receiving means and the processing request notifying means, and refers to the protocol storage means. It is determined that the version of the message format attached to the message is a version of the message format capable of executing transaction processing in the host computer, and the host computer is in a high load state, and the host processing state If there is an unconfirmed host computer in the table, the host further adds a host processing status table for all the host computers that has not been confirmed to the message, and the global message queuing file input / output means outputs the global message key. Stored in the over viewing files, characterized by requesting the transaction processing of the message to an unverified other host computer in the host processing state table by said processing request notification unit.

The transaction load balancing system in the eleventh loosely-coupled multi-computer system of the present invention comprises
In the transaction load distribution system in any one of the tenth to tenth loosely coupled multiple computer systems, the message processing host determining unit further receives a message from the message transmitting / receiving unit and the processing request notifying unit, and refers to the protocol storage unit. It is determined that the version of the message format attached to the message is a version of the message format capable of executing transaction processing in the host computer, and the host computer is in a high load state, and the host processing state When there is no unconfirmed host computer in the table, the transaction processing for the received message is executed by the transaction execution processing means.

The transaction load distribution system in the twelfth loosely-coupled multi-computer system according to the present invention has a seventh configuration.
To the transaction load distribution system in any one of the eleventh to eleventh loosely-coupled multi-computer systems, the processing request notifying means further comprises:
A message stored in the global message queuing file is read by the global message queuing file input / output means.

[0020]

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

Referring to FIG. 1, one embodiment of the present invention is:
Global message queuing file (G
Host A (host number 0001) and host B, which share a loosely-coupled multi-computer system by sharing 3
(Host number 0002) and a communication control device 10 for controlling transmission and reception of messages between the host A, the host B and the terminal 11.

Each of the host A and the host B has a transaction processing system.

The transaction processing system comprises a transaction execution processing means 1 having a business program for performing message processing, a message processing host determination means 2, a GMQF input / output means 4, a protocol update means 5, a protocol storage means 6, and a protocol notification means 7. , A processing request notifying means 8 and a message transmitting / receiving means 9.

FIG. 2 is a diagram showing a data format of information stored in the protocol storage means 6 for storing the protocol information of another host received by the protocol notification means 7. The storage information includes a number 21 of each host and a protocol version 22 that can be processed by the transaction processing system of each host.

FIG. 3 is a diagram showing a data format stored in the GMQF3. The stored information includes the protocol version 31 of the input transaction message.
And a host processing state table 32 and a received message 33 which indicate a message processing state in each host.

FIG. 4 is a diagram showing internal information of the host processing status table (32 in FIG. 3) stored in the GMQF3.
The information to be stored includes a host number 41 and a processing state 42 of the host. If the host confirms that the protocol version of the input message cannot be processed, the processing state is confirmed, but not confirmed. In the case of, set unconfirmed.

FIG. 5 is a diagram showing information held in the protocol storage means 6 of each transaction processing system when a loosely coupled multi-computer system is constituted by five hosts having transaction processing systems having different protocol versions. It is.

Hereinafter, a transaction load distribution system in a loosely-coupled multi-computer system according to an embodiment of the present invention will be described with reference to FIG.

The user inputs a message for causing the host A to execute a desired transaction process from the terminal 11 by attaching a protocol version of the message.

The message input from the terminal 11 is received by the message transmitting / receiving means 9 of the transaction processing system in the host A via the communication processing device 10 (step 61).

The message received by the message transmitting / receiving means 9 is passed to the message processing host judging means 2 (step 62), and the host (self) to be processed according to the protocol version attached to the message and the load status of the host. Host / other host is determined (step 6)
3).

In step 63, first, the protocol version attached to the received message is higher than the protocol version of the message stored in the protocol storage device 6 and capable of executing the transaction processing by the host. Request the other host to process the message.
When it is determined that the resource usage rate such as the U usage rate, the memory usage rate, and the number of times of input / output is higher than a preset threshold, that is, the load of the host is high, the processing of the message is requested to another host.

When the message processing host determining means 2 determines that the message is to be processed by another host, the message processing version is added to the received message with the protocol version of the message and a host processing status table of all hosts unconfirmed.
It is stored in the GMQF 3 using the MQF input / output means 4 (step 64), and the processing request notifying means 8 requests processing from another host (step 65).

If the message processing host determining means 2 determines in step 63 that the message is to be processed by its own host, the received message is passed to the transaction execution processing means 1 without being stored in the GMQF 3 to execute the transaction processing. (Step 66).

The processing request notification means 8 of the host B receives the processing request notification from the host A (step 67), and
The GMQF3 message is read out using the F input / output means 4 (step 68). The message reading of the GMQF3 is performed not only at the time of receiving the processing request notification, but also at the time of completion of the transaction in progress (load reduction) and at regular intervals.

The message processing host determination means 2 of the host B refers to the host processing state table added to the read message (step 69). If the host is in an unconfirmed state, it is stored in the protocol storage means 6. Referring to the information, the version of the processable protocol of the host and the version of the protocol added to the read message are compared (step 6A).

If the version of the protocol added to the read message is the same or lower than the version of the protocol that can be processed by the host, the message processing host determination means 2 of the host B further checks the host. It is determined whether or not the load is high (step 6B). If the load of the host is high, the GMQF3 remains in the host processing state table with the processing state of the host being unconfirmed.
Is stored again (step 6C). In an environment where the load on the host is low and the transaction can be executed, it is further determined whether or not the transaction execution processing means 1 is in an active state (step 6D). Assuming that the processing state has been confirmed, the transaction processing corresponding to the protocol of the message is executed (step 6E). When the transaction execution processing means 1 is inactive, the host B
Since the transaction processing cannot be executed, the processing state of the host in the host processing state table is confirmed, and the message is stored again in the GMQF3 (step 6F).

After the end of step 6C, the message processing host determining means 2 of the host B determines whether or not there is any other host in an unconfirmed state in the host processing state table (step 6).
G) If it is determined that there is another host in the unconfirmed state, it is further determined from the contents of the protocol storage means 6 whether the other host can process the protocol version of the message ( Step 6H).
If it is determined in step 6G that there is no other host in the unconfirmed state, and if it is determined in step 6H that the other host cannot process the protocol version of the message, step 6D
To If it is determined in step 6H that the other host can process the protocol version of the message, the processing request notifying unit 8 requests the other host to perform processing (step 6I).

If the message processing host determining means 2 of the host B determines in step 6A that the version of the protocol added to the read message is higher than the version of the protocol that can be processed by the host B, Since the own host cannot execute the transaction processing, the processing status of the own host in the host processing status table has been confirmed, and the message is stored again in the GMQF3 (step 6J).

Separately from this, when the transaction processing system starts up or at regular intervals after the start-up, the protocol notification means 7 stores the protocol version of the message which can be processed by the own transaction processing system in the protocol storage means 6. Register and notify other hosts. The protocol notifying means 7 of the host that has received the notification updates the protocol version of the host in the protocol storage means 6 using the protocol updating means 5 with the notified protocol version.

Next, a method of storing the protocol version will be described with reference to FIG.

The information notified to the other host by the protocol notifying means 7 is the host number of the own host and the version of the protocol of the message by which the host can execute the transaction processing. Upon receiving the protocol notification from the protocol notification means 7, the protocol update means 5 stores the protocol version 22 in the protocol storage means 6 corresponding to the notified host number 21. The version of the protocol of the host that has not received the protocol notification is not confirmed in the protocol storage means and is not a candidate for a processable host.

Next, the data format of GMQF3 is shown in FIG.
This will be described with reference to FIG.

When a message is received from the communication processing apparatus 10 and the message processing host determining means 2 determines that the message is to be processed by another host, the protocol version 31 which can be processed and a host processing status table in which all hosts are unconfirmed are set. 32 to the received message 33
Store it in QF3. When the message is read from the GMQF3, when the protocol version of the message is a message of a protocol version higher than that of the own transaction processing system, or when the read transaction execution processing means 1 of the host is inactive, the transaction is executed. Is impossible, the processing state 42 corresponding to the host number 41 in the host processing state table 32 is confirmed and written back to the GMQF3.

Next, an example of load distribution when a loosely-coupled multi-computer system is configured with five hosts having mixed protocols will be described with reference to FIG.

Host A (host number 0001) to host E (0005) constitute a loosely coupled multiple computer system, and the protocol versions that can be processed by the transaction processing system operating on each host are host A = 2 and B, respectively. = 2, C = 3, D = 2, and E =
When the number is 3, the information stored in the protocol storage unit 6 of each transaction processing system is as shown by 51 in FIG.

When a transaction message having a protocol version of 2 is input to this loosely coupled multi-computer system, all the hosts capable of processing the protocol version 2 message from the contents of the protocol storage means 6 are all hosts. The host becomes a target of load distribution and is processed by a host with a low load. In the case of a transaction message with a protocol version of 3,
The hosts that can be processed are the hosts C and E based on the contents of the protocol storage means, and the two hosts perform load distribution.

As described above, the processing of the transaction load balancing system in the loosely-coupled multi-computer system according to one embodiment of the present invention is completed.

The transaction load distribution system in the loosely coupled multi-computer system according to one embodiment of the present invention adds a protocol version to a message stored in the GMQF3, thereby providing a protocol that can be processed by its own transaction processing system. G for messages with the same or lower protocol version
When the message is read from the MQF3, transaction processing corresponding to the message can be performed. In the case of a message of a higher protocol version, processing corresponding to the protocol version such as re-storage in the GMQF3 can be performed. Transaction processing for messages of different versions can be executed in a distributed manner by the transaction processing systems of the respective hosts constituting the loosely-coupled multi-computer system.

[0050]

As described above, the transaction load balancing system in the loosely-coupled multi-computer system of the present invention mutually notifies and recognizes the protocol version of the transaction processing system on another host, thereby recognizing the protocol version. Since it is possible to determine the host that can process each time, transaction processing for messages with different protocol versions,
It can be executed in a distributed manner in the transaction processing system of each host constituting the loosely-coupled multi-computer system, and even if a failure occurs in any of the hosts constituting the loosely-coupled multi-computer system, it is not executed on the host. This has the effect that the transaction processing can be continued on another host.

Further, there is an effect that the terminal user can input a message without being aware of the protocol version and execute a transaction process.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing the contents of a protocol storage means 6 in one embodiment of the present invention.

FIG. 3 is a diagram showing the contents of GMQF3 in one embodiment of the present invention.

FIG. 4 is a diagram showing the contents of a host processing status table in one embodiment of the present invention.

FIG. 5 is a diagram for explaining an example of load distribution when a loosely-coupled multi-computer system is configured by five hosts with mixed protocols in one embodiment of the present invention.

FIG. 6 is a flowchart showing the processing of the message transmitting / receiving means 9, the message processing host determining means 2, the GMQF input / output means 4, the processing request notifying means 8, and the transaction execution processing means 1 in one embodiment of the present invention.

[Explanation of symbols]

1 transaction execution processing means 2 message processing host judgment means 3 global message queuing file (G
MQF) 4 GMQF input / output means 5 Protocol update means 6 Protocol storage means 7 Protocol notification means 8 Processing request notification means 9 Message transmission / reception means 10 Communication processing device 11 Terminal 21 Host number 22 Protocol version 31 Protocol version 32 Host processing status table 33 Reception Message 41 Host number 42 Processing status 51 Contents held by protocol storage means of transaction processing system of each host

Claims (12)

(57) [Claims] 1. A plurality of host computers that execute transaction processing, and a terminal that attaches a message format to a message for executing the transaction processing and sends it to any of the plurality of host computers via a communication control device. And a loosely coupled multiple computer system having an external storage device shared by the plurality of host computers, wherein the host computer registers a message format of a message capable of executing transaction processing for each of the plurality of host computers. Protocol storage means, and at the time of start-up of the host computer and at regular time intervals, register the message format of a message which allows the host computer to execute transaction processing in the protocol storage means and notify other host computers. Protocol notification means to Protocol update means for registering a message format of a message notified by the host computer that the other host computer can execute transaction processing in the protocol storage means; receiving a message from the terminal, and referring to the protocol storage means If the message format attached to the message is a version of the message format in which the transaction processing can be executed by the host computer, and the host computer is not in a high load state, the transaction processing for the received message is performed. A transaction load balancing system in a loosely-coupled multi-computer system, comprising a message processing host determining means for executing 2. The message processing host determining unit further receives a message from the terminal, and executes a transaction process in a host computer of a message format attached to the message by referring to the protocol storage unit. 2. The transaction load balancing system in a loosely coupled multi-computer system according to claim 1, wherein when it is determined that the message format is not an acceptable message format, the message is stored in the external storage device. 3. The message processing host judging unit further receives a message from the terminal, and executes a transaction process in a host computer of the message format attached to the message by referring to the protocol storage unit. 3. The loosely-coupled connection according to claim 1, wherein the message is stored in the external storage device when the host computer is determined to be in a message format that can be used and the host computer is in a high load state. Transaction load distribution system in a multi-computer system. 4. A plurality of host computers that execute transaction processing, and a terminal that attaches a message format to a message for executing the transaction processing and sends it to any of the plurality of host computers via a communication control device. And a loosely coupled multiple computer system having an external storage device shared by the plurality of host computers, wherein the host computer registers a message format of a message capable of executing transaction processing for each of the plurality of host computers. Protocol storage means, and at the time of start-up of the host computer and at regular time intervals, register the message format of a message which allows the host computer to execute transaction processing in the protocol storage means and notify other host computers. Protocol notification means to Protocol update means for registering, in the protocol storage means, a message format of a message notified by the host computer that the other host computer can execute transaction processing; and completion of transaction processing in the own host computer and at a fixed time interval. Each time a message is read from the external storage device with reference to the protocol storage means, the message format attached to the message is a version of a message format that allows the host computer to execute a transaction process, and A transaction load distribution system in a loosely-coupled multi-computer system, characterized by including a message processing host determining means for executing a transaction processing on a received message when the host computer is not in a high load state. 5. The message processing host judging means further reads a message from the external storage device at the completion of transaction processing in the host computer and at regular time intervals, and refers to the protocol storage means to attach the message to the message. 5. The sparse message storage device according to claim 4, wherein when it is determined that the message format is not a message format in which transaction processing can be executed by the host computer, the message is stored in the external storage device. A transaction load distribution system in a coupled multiple computer system. 6. The message processing host determining means further reads a message from the external storage device at the time of completion of transaction processing in the host computer and at regular time intervals, and refers to the protocol storage means to attach the message to the message. If the determined message format is a message format in which transaction processing can be executed by the host computer, and the host computer is in a high load state, the message is stored in the external storage device. 6. A transaction load distribution system in a loosely-coupled multi-computer system according to claim 4, wherein: 7. A system comprising: a plurality of host computers for executing transaction processing; a communication control device for controlling transmission and reception of messages between the plurality of host computers and terminals; and an external storage device shared by the plurality of host computers. In the loosely-coupled multi-computer system, the terminal inputs a message for causing any of the plurality of host computers to execute a desired transaction process with a message format version of the message attached thereto, and the external storage device A global message queuing file for storing data transferred between the plurality of host computers, wherein the host computer receives a message input from the terminal via the communication control device; Transaction of message input from the terminal Transaction execution processing means for executing processing; protocol storage means for registering a message format version of a message capable of executing transaction processing for each of the plurality of host computers; at start-up of the own host computer and at fixed time intervals Protocol notification means for registering a message format version of a message in which the own host computer can execute transaction processing in the protocol storage means and for notifying the other host computer, A protocol update unit for registering a message format version of a message which can execute the transaction processing by the other host computer in the protocol storage unit; and data for the global message queuing file. A global message queuing file input / output unit for performing input / output, and requesting transaction processing of a message input from the terminal to another host computer, and receiving a transaction processing request from another host computer, A processing request notifying means for reading out a message stored in the global message queuing file by the queuing file input / output means; and a transaction processing for a message input from the terminal cannot be executed for each of the plurality of host computers. A host status management table for registering whether the message has not been confirmed or confirmed, and a message received from the message transmitting / receiving means and the processing request notifying means, and attached to the message by referring to the protocol storage means. And version of the message format and is the version of the message format that can perform transaction processing in the local host computer,
When the host computer is not in a high load state and the transaction execution processing unit is in an active state, the transaction execution processing unit executes a transaction process for a received message by the transaction execution processing unit. Transaction load balancing system in a loosely coupled multi-computer system. 8. The message processing host determining means further receives a message from the message transmitting / receiving means and the processing request notifying means, and refers to the protocol storing means to determine a message format version attached to the message. If the host computer is in a message format version capable of executing transaction processing, and the host computer is not in a high load state, and the transaction execution processing means is in an inactive state, the message further includes the host computer. 8. The loosely-coupled multi-computer system according to claim 7, wherein a host processing status table confirmed for the computer is added to the global message queuing file by the global message queuing file input / output means. Tran Transfection load balancing system. 9. The message processing host determining means further receives a message from the message transmitting / receiving means and the processing request notifying means, and refers to the protocol storing means to determine a version of the message format attached to the message. If it is determined that the version is not a message format version in which transaction processing can be executed by the host computer, the global message queuing is added to the message with a host processing status table that has been confirmed for the host computer. 9. The transaction load distribution system in a loosely-coupled multi-computer system according to claim 7, wherein the global message queuing file is stored by a file input / output unit. 10. The message processing host determining means further receives a message from the message transmitting / receiving means and the processing request notifying means, and refers to the protocol storage means to determine a message format version attached to the message. If it is determined that the version is a message format version that can execute transaction processing on the host computer, and the host computer is in a high load state, and there is an unconfirmed host computer in the host processing state table, Attached to the message is a host processing status table that has not been confirmed for all host computers.
The global message queuing file is stored in the global message queuing file by the global message queuing file input / output means, and the processing request notification means requests another host computer which has not been confirmed in the host processing status table to perform a transaction processing of the message. The transaction load distribution system in the loosely-coupled multi-computer system according to any one of claims 7 to 9. 11. The message processing host determining means further receives a message from the message transmitting / receiving means and the processing request notifying means, and refers to the protocol storage means to determine a message format version attached to the message. If it is determined that the version is in a message format in which transaction processing can be executed by the host computer, and the own host computer is in a high load state, and there is no unconfirmed host computer in the host processing state table, the reception is performed. 11. The transaction load distribution system in a loosely-coupled multi-computer system according to claim 7, wherein a transaction process for said message is executed by said transaction execution processing means. 12. The processing request notifying means is further stored in the global message queuing file by the global message queuing file input / output means at the completion of transaction processing in the host computer and at regular time intervals. The transaction load distribution system in a loosely-coupled multiple computer system according to any one of claims 7 to 11, wherein a message is read.