Browse Prior Art Database

Information Management System/Enterprise Systems Architecture 5.1 Open Transaction Manager Access Logging Improvement

IP.com Disclosure Number: IPCOM000118854D
Original Publication Date: 1997-Aug-01
Included in the Prior Art Database: 2005-May-09
Document File: 4 page(s) / 80K

Publishing Venue

IBM

Related People

Lai, RS: AUTHOR [+4]

Abstract

In the current Information Management System (IMS) support for Set and Test Sequence Numbers (STSN) devices, output sequence numbers are logged as part of the following events.

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This is the abbreviated version, containing approximately 52% of the total text.

Information Management System/Enterprise Systems Architecture 5.1
Open Transaction Manager Access Logging Improvement

      Client                              IMS/TM
    Initial: R=1 S=5                     Initial: R=5 S=1
                    1  Transaction
                    ------------------>
                    2 ACK
             R=1 S=6 <------------------ Enqueue and log X'35'
  record
                                                 R=6 S=1
                                         Transaction runs
                                         Enqueue output
                                         Retrieve output
                                         Log X'31' record with
                                         pending send se number
  set
                                         to 2
                    3 Data
      Receive output <------------------ Send output
                    4 ACK
             R=2 S=6 --------------> IMS FAILS!!
                                         IMS restart
                                                 R=6 S=1
                                         Resynchronization
                    5 REQresynch(6 1)
                     <------------------
                    6 REPresynch (2 6)
                     ------------------> Dequeue output
                                                 R=6 S=2
                    7 ACK
                     <------------------

    Figure Message Flow with IMS/ESA 5.1 OTMA Logging Improvement

      Novel Advance over the Prior Art

      In the current Information Management System (IMS) support for
Set and Test Sequence Numbers (STSN) devices, output sequence numbers
are logged as part of the following events:
  1.  After enqueueing the output message, IMS retrieves the
       message from message queue and logs X'31' log record.
  2.  Pending send sequence, number is incremented by 1 and
       logged in X'66' log record.
  3.  Send the message to the client and wait for acknowledgement
       from the client.
  4.  Receive acknowledgement from the client.
  5.  The message is dequeued and X'36' log record is logged.

      Writing of the unnecessary X'66' log record a...