On 2018-11-29 4:28 AM, Lizette Koehler wrote:
Logrec is not only preformatted, but it is a wrap around datasets.
So it (LOGREC) always knows where the last record was written in the file.
If it gets to the point of overlaying the data, I think an IFC message is
produced to let you know you are about to lose data.
When IFCDIP00 is used to initialize SYS1.LOGREC, it writes 2 40-byte
records (also blocks since RECFM=U), the first containing the CCHH range
of the data set and the CCHHR of the 90% full mark and the next CCHHR to
be used for a new record. The second record is what I call (rightly or
wrongly) the "3 minute currency record" which I've observed gets updated
every 3 minutes or so with a new current timestamp.
When the LOGREC data set gets to 90% full message IFB080E is issued.
When the LOGREC data set becomes full message IFB082I is issued.
You can offload the contents and make the data set available for more
data by running IFCEREP1 (with the appropriate control inputs), or you
can throw the data away and reinitialize LOGREC with IFCDIP00.
If you really want to know how full it is in a reasonably convenient
fashion then you can write a program to read the first record and
calculate and report the fullness, or get a program which already does
this. One such program is the public domain data set browser called
REVIEW which will format and display some summary data from each LOGREC
record when the LOGREC data set is browsed and EREP ON is specified.
Cheers,
Greg P.
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