Reducing PI Map Memory Requiement via Premap
We are trying to map large 200+ MB XML files using PI 7.11.
The target is a flat CSV. The maps are quite complex with multiple lookups.
Since we only use a small subset of the xml fields in the source file, I'm wondering if the following "PreMap" would help reduce the memory requirements.
Source XML(200MB+) -> PreMap-> Source XML*(100MB+)
Source XML*(100MB+) -> MainMap ->Target CSV(10MB)
How does this compare with:
Source XML(200MB+) -> MainMap ->Target CSV(10MB)
1) Both maps are MessageMappings.
2) PreMap is a simple map that discards all XML fields that MAP2 doesn't need, but keeps the same XML structure.
3) MainMap is a complex map that will have mulitple lookups.
Is there any benefit to a PreMap that filters out fields that are not required by the main map? Or maybe it makes things worse?
I'm hoping to optimize memory consumption.