Reducing Fast Path logging

Because IMS holds updates for DEDBs in storage before writing entire VSAM control intervals (CIs), you can reduce the logging for Fast Path data. You reduce the log volume by logging only the changed data for each log record during replace (REPL) calls. You can reduce the logging only if the length of the segment remains unchanged.

Use the LGNR parameter of the IMS or DBC procedures to determine the maximum number of Fast Path DEDB buffer alterations that are to be held before IMS logs the entire VSAM control interval (CI). Use the Fast Path Log Analysis utility (DBFULTA0) to evaluate the value you should use for the LGNR parameter.