Author: mucka
Subject: Reply to: Need help in estimating space of unload file
Posted: Wed Apr 12, 2017 1:15 am (GMT 5.5)
This could be difficult to estimate. What kind of IMS DB. HIDAM adds to the ESDS front to back on dataset. It can however have free space. HDAM DBs are given space and the randomizer puts roots wherever they key randomized to. So if you look at a listcat no matter how many segments the report looks the same. Another issue is are your IMS segments compressed in the database? With some utilities you can leave them compressed when you reorg the DB but you can't read them. So you would have to unload them uncompressed or have a user written program. If no compression it is a simple task to find out how much space. Each segment has a defined length. Take that length and multiply by the number of that type of segments. Do that for each segment type and add them all together.
You asked a very simple question but the answer might not be simple.
mucka
Subject: Reply to: Need help in estimating space of unload file
Posted: Wed Apr 12, 2017 1:15 am (GMT 5.5)
This could be difficult to estimate. What kind of IMS DB. HIDAM adds to the ESDS front to back on dataset. It can however have free space. HDAM DBs are given space and the randomizer puts roots wherever they key randomized to. So if you look at a listcat no matter how many segments the report looks the same. Another issue is are your IMS segments compressed in the database? With some utilities you can leave them compressed when you reorg the DB but you can't read them. So you would have to unload them uncompressed or have a user written program. If no compression it is a simple task to find out how much space. Each segment has a defined length. Take that length and multiply by the number of that type of segments. Do that for each segment type and add them all together.
You asked a very simple question but the answer might not be simple.
mucka