When startup services will run?
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When packages are loaded into memory
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When IS startup
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When IS is restrated
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Wlile login to the server
Startup services run when packages are loaded into memory during the Integration Server initialization process. They are triggered automatically when the IS starts up and packages are being loaded, which occurs before IS restarts complete and is separate from login events.
Startup services in an Information Server/ETL environment run when the relevant packages are loaded into memory during system initialization, since that's the point at which the runtime environment becomes ready to execute configured startup logic. This is distinct from a plain login event or an IS restart trigger, which don't by themselves guarantee packages have been loaded.