Stage0 Interactions with Databases

The following is known or assumed:

1. Stage0 is a special class of online consumer which reads from the datastream during a data taking run, determines calibration constants critical for production (e.g. the COT time to distance relationship), and then writes them to the calibration DB. In run 1 there was also a process called Post0 that ran immediately after the run finished, processed files that Stage0 produced during the run, and the production of the runs data in the farms did not begin until Post0 completed (it is unclear whether there will be Post0 processing in run 2).
2. Stage0 will need to access the calibration DB "Used_Sets" for the online hardware and level 3 (possibly different). The output of Stage0 will be needed to produce "Valid_Sets" of calibrations for the production farms.

Documents

• COT & Muon Calibration & Monitoring : Presentation by A. Savoy-Navarro about cot information that will be saved in CDF Conditions Database and its interaction with Stage0. Also, overview of various online databases.