CICS Nov title - CBT Tape

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c_warm = RC_FAILURE; /* Set return code */ } /* */ return rc_warm; /* Function Entry */ { /* */ /*--------------------------------------------------------------------* * local variables * *--------------------------------------------------------------------*/ /*--------------------------------------------------------------------* * code * *--------------------------------------------------------------------*/ exit(EXIT_FAILURE); /*
AUTODELETE (YES or NO) specifies whether the MVS System Logger will perform an automatic physical deletion of log data, or whether an explicit IXGDELET macro call is required to perform the delete. The default values are AUTODELETE(NO) and RETPD(0). Always specify AUTODELETE(NO) and RETPD(0) for the CICS system log streams DFHLOG and DFHSHUNT. This is important for two good reasons – data integrity and system performance. CICS manages its own system log data deletion, by ‘trimming the tail’ of the DFHLOG and DFHSHUNT system log streams during keypoint operations when appropriate to do so. This ensures CICS deletes only log data when there is no further need to retain the information for recovery purposes. If AUTODELETE(YES) is specified, the MVS System Logger could physically delete system log data that was still required to guarantee data integrity for a task abend or system restart. Also, if a non-zero RETPD value were specified for the system log streams, the MVS System Logger would not physically delete log data until it has reached this age. Hence redundant data marked for deletion by CICS tail-trimming would not be physically deleted by the MVS System Logger at the next opportunity (a subsequent offload process occurring), resulting in unnecessary I/O activity to retain it. HIGHOFFLOAD AND LOWOFFLOAD VALUES HIGHOFFLOAD and LOWOFFLOAD are specified (as percentage values) when a log stream is defined. They represent the boundary limits, relating to the space used by the log stream, that control when MVS System Logger ‘offload processing’ is to occur. Offload processing is used to optimize the use of log stream primary storage (that is, space within a structure on the Coupling Facility, or within staging datasets for DASD-only logging). One trigger for the start of offload processing is when the primary storage utilization for a log stream reaches its HIGHOFFLOAD value. When this happens, the MVS System Logger will physically delete log data that has already been logically deleted by ‘tail-trimming’, which was carried out automatically by CICS keypoint processing. This operation will free up space within the log stream’s primary storage. Having completed this work, the percentage of remaining log data may now be less than the LOWOFFLOAD value. If it is not, the MVS System Logger will © 2000. Reproduction prohibited. Please inform Xephon of any infringement. 7
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CICS Nov title - CBT Tape

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