View source for Proposal for an online conditions database

* During data taking various conditions of the detector, electronics, data acquisition system, hall, and counting room will be recorded.
* These data will be recorded in different ways for different reasons, but one of the main uses is for use in subsequent data analysis.
* Things like magnet power supply currents, temperatures, trigger rate, scalers will all need to be available for offline processing.
* These quantities will need to identified by time of recording, run number, and perhaps event number.
* These quantities will not have to be recorded on an event-by-event basis; most will only be recorded once per run.

Proposed schema:

[[Image:Online.png||online conditions database schema]]

Features:

* Different processes can update quantities for which they are responsible independently.
** Special events, e. g., scalers
** Alarm systems
** Log book
* Central server alone needs to know DAQ status (single number, the ID)
* New quantities can be added without re-writing the schema
* Frequency of update completely determined by the data producing client