The user log file contains the records created by the application program with LPUT calls. The user log file must be created as a file generation group.
openUTM does not write the user log records directly into the log file, rather saves them first of all in the page pool of the KDCFILE. If the number of UTM pages in the page pool generated with MAX...,LPUTBUF=number are used by LPUT records, openUTM copies the records to the user log file. The records are copied outside the user transaction. If the application is terminated normally, openUTM likewise copies the records to the user log file.
The number of UTM pages specified in LPUTBUF=number must be taken into account when generating the size of the page pool with MAX...,PGPOOL=number.
The MAX...,LPUTLTH=length statement affects the block length of the user log file. It is calculated by openUTM and can be greater than the standard block of 2KB.
openUTM can only copy LPUT records to the user log file if this file is created and can be accessed by openUTM.
Note that the user log file is overwritten from the start following a KDCDEF or KDCUPD run; otherwise, data is added to the end of the file. For this reason, you should evaluate the log records before a KDCDEF or KDCUPD run.