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pfaulkner · Posted: Thu Feb 20, 2003 3:01 pm Post subject:

I have a message flow that accepts messages in BLOB and then parses them in 2 parts.

1. Every message has a header, I extract this from the BLOB
- SUBSTRING(InputBody.BLOB FROM 1 FOR 200).
2. Every message has a data part. I also extract this from the BLOB
- SUBSTRING(InputBody.BLOB FROM 201).
This part of the message is later parsed and converted to COBOL (from XML)

When the messages are relatively small (1000 bytes or so) I don't see any performance issues. Infact there is very little difference between going through SI and going direct MQ without any parsing.

I have another message that is 32000 bytes but I only needed to parse the first 200 bytes of it to convert to various XML tags, the remainder of the message I need to send back in another TAG but as BLOB.
So I took my Data Part of the message and extracted the first 200 bytes of it and used RCD and Compute to parse into XML. I also used SUBSTRING to extract the last 31800 bytes and stored in Environment so I could simply add to my parsed XML structure later.

Now I see my performace go from 0.3 seconds without using SI to over 4 seconds when I do this.

I am only parsing small amounts of data from my original 32k message so why the performace hit???

Any help would be greatly appreciated.