[webservices] caching in dataselect and tracedsp

[John D. West]

Hello.

I am working on code that retrieves corrected traces from the DMC using the
dataselect and tracedsp web services. I notice that a second retrieval of
the same data is much, much faster, presumably because the data is being
cached by the DMC web services. I am retrieving broadband 40Hz data in
60-hour increments.

Do these web services cache more data than I ask for? Can I speed up my
requests by either sequentially asking for data for the same channel (i.e.,
ask for 60 hours of BHZ for a station, then ask for the next 60 hours,
etc.) or by asking for multiple traces for the same time period (i.e., 60
hours of BHZ, then 60 hours of BHE & BHN for the same station & time span)?

Thanks!

     -- John
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