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Log file control system in a complex system

  • US 5,455,947 A
  • Filed: 05/28/1993
  • Issued: 10/03/1995
  • Est. Priority Date: 05/28/1992
  • Status: Expired due to Term
First Claim
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1. A log file control system used in a complex system comprising a plurality of computer systems connected for communications in said complex system for performing transactions, a data base shared among said computer systems, and a high-speed storage unit shared among said computer systems, said log file control system comprising:

  • a log file, shared among said computer systems and coupled to said data base, for managing log data of said data base;

    a log data buffer in said high-speed storage unit for temporarily storing the log data;

    an inter-system exclusion control table in said high-speed storage unit for controlling an exclusion lock on said log data buffer;

    a backout file, provided for each computer system, for temporarily the storing log data to be transmitted to said log data buffer; and

    log file control means in each of said computer systems for controlling said log file, said backout file, said log data buffer, and said inter-system exclusive control table so that said log data is transmitted to said log file asynchronously when a transaction is performed in at least one of said computer systems;

    wherein said log file control means comprises saving means for completing a transaction by storing log data in said backout file at the end of a transaction process so that a succeeding transaction can be started.

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