Re: Expensive op codes

Peter,

At 12:01 AM 10/18/99 -0700, you wrote:

>As I mentioned in an earlier post, I fail to see why READE and READ/compare
>are so different. They are both doing sequential reads (last time I checked
><g>) and then comparing some key fields to determine whether to use the
>record or not. I would like to think that it's possible for the READE code
>to read a block of records just as READ does, and look at each record within
>the block to do it's compare before either passing the record to the program
>or setting the = indicator. This is something that could be tweaked by IBM
>at any time.

 1) Functionally, one way READE works differently is that the data does not
populate the input fields if the key is not equal.  Code has to be
generated for that.

2)  When the EOF indicator comes on, this is considered an "error"
condition to that opcode.  I/O error conditions tend to be expensive.

 -mark

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