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Hi Herbert, You seem to be describing server-side functions. Unfortunately, THREDDS doesn't currently support them. There's certainly a compelling use case there, but there are pretty thorny security issues to work out as well. You may be interested to know that Hyrax supports them [1]. However, it looks like functions can only be added at install time of the server, not runtime. As for read performance, the 100TB aggregation will certainly take longer the first time its data is accessed. However, subsequent acceses should benefit from caching and be much faster. Cheers, Christian [1] http://docs.opendap.org/index.php/Hyrax:_Server_Side_Functions Ticket Details =================== Ticket ID: JUE-335127 Department: Support THREDDS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.