How to monitor progress of web-service calculation? And abort it?

Hello. We're thinking of converting an existing Java radar calculation program into a web-service, so that it can be used by various interested parties. However, calculations can take some time (several minutes) and so we would like the client to be able to both show calculation progress and allow the user to abort the calculation if necessary. It is not obvious to us how to do this with a web-service. Are there any standard approaches to this problem? What's the best way of a client asking the web-service how a calculation is progressing? What's the best way for a client to abort a calculation? Any advice most welcomed.
Kind regards
Paul Howland
NATO C3 Agency
The Hague

You can't estimate the duration withour running the gather_database_stats. You can monitor it while it is running. (e.g. count the tables that have got updated statistics based on DBA_TABLES)
And if you run gather_database_stats, the default behaviour might well be to exclude tables which aren't "stale" while in the imported database the expectation is to gather stats on all tables.
(Similarly, the behaviour to gather column histograms (method_opt) may differ in an existing database from a newly imported database)
Hemant K Chitale
Edited by: Hemant K Chitale on May 14, 2013 10:13 AM

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