Performance Advice from a Mysterious Friend, Part 3
April 2, 2008 Ted Holt
Here’s a third performance tip from one of your fellow subscribers, whose identity I have agreed to hold in confidence. I appreciate the feedback I have received in response to his previous tips and hope to publish some of your comments in the near future.
Here’s performance tip number 3: “Use CHGJRN to set MINENTDTA to *FLDBDY.”
When you journal a file, you record changes that are made to contents of the file. You keep a record of each record added to the file, each record that is removed from the file, and each record that is changed. All of these record images consume disk space. You can reduce the amount of needed disk space by telling the system to minimize entry-specific data (the record images) when possible.
Here’s more information about minimized entry-specific data from IBM’s V5R4 Information Center.