Author: Artemk
Subject: IMS BMP program causes 878 system abend
Posted: Tue Nov 22, 2016 8:26 pm (GMT 5.5)
Hi, actually I'm a beginner in IMS tuning, and reading docs for me is better, but I already digged through tonns of it, learned numeros new things, but still have no idea what how to locate where does my problem come from.
It would be great if someone hints me where to dig. Some times I even think that it could be an internal IMS defect caused by memory leak...
The problrem is that some times I get 878 abend while batch program processing. The only message displayed is "DFS629I IMS XFP TCB ABEND - SYS 878 IVP1"
Configuration is like this: IMS version 12, z/os 1.13, batch is executed for initial load of DEDB, Fast path 64bit buffer manager is enabled, it's buffer size is maximal 2047M. The number of segments inserted is about 11million, total size of loaded data is 1,9GB.
BMP program is written to make checkpoints either after getting FW or every N inserted segments (N is about 1500).
The only dependency I figured out for now is that if NBA is bigger than 2000 in one BMP, or if there are several BMPs that use total NBA > 2000, and the scope of data inserted is long enough, I'm getting abend after about 200-300 checkpoints.
If NBA is 2000 or less, I do not get abend - at least while loading my 2GB of data, may be if I had 20, I got, who knows...
Thanks,
Artem
Subject: IMS BMP program causes 878 system abend
Posted: Tue Nov 22, 2016 8:26 pm (GMT 5.5)
Hi, actually I'm a beginner in IMS tuning, and reading docs for me is better, but I already digged through tonns of it, learned numeros new things, but still have no idea what how to locate where does my problem come from.
It would be great if someone hints me where to dig. Some times I even think that it could be an internal IMS defect caused by memory leak...
The problrem is that some times I get 878 abend while batch program processing. The only message displayed is "DFS629I IMS XFP TCB ABEND - SYS 878 IVP1"
Configuration is like this: IMS version 12, z/os 1.13, batch is executed for initial load of DEDB, Fast path 64bit buffer manager is enabled, it's buffer size is maximal 2047M. The number of segments inserted is about 11million, total size of loaded data is 1,9GB.
BMP program is written to make checkpoints either after getting FW or every N inserted segments (N is about 1500).
The only dependency I figured out for now is that if NBA is bigger than 2000 in one BMP, or if there are several BMPs that use total NBA > 2000, and the scope of data inserted is long enough, I'm getting abend after about 200-300 checkpoints.
If NBA is 2000 or less, I do not get abend - at least while loading my 2GB of data, may be if I had 20, I got, who knows...
Thanks,
Artem