I was sent a copy of a job log from weeks ago, and had been asked to identify which parts of the job had run the longest. Fortunately, the spool file of the job log was still available so I could do some SQL magic to extract useful information from it. The first thing I want to do is to determine is how long each program or command took. I can extract the timestamp from the spool file, but I need to be able to retrieve the timestamp for the previous entry too. How can I retrieve that information for the previous entry?
After a bit of searching I found a SQL function that would allow me to do this. Rather than go straight into showing what I did with the joblog spool file, I am going to start with a simpler example. I have a DDL table, TESTTABLE, that has a decimal column, TEST_NUMBER, and nine rows of data. I can show the data using the following SQL statement:
01 SELECT TEST_NUMBER 02 FROM TESTTABLE |
Which returns: