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The documentation for each db file can be found at the top of the corresponding substitutions file. \[Wouldn't it be nice to have a better place to keep it? It can't get into the db files because it's not a macro, and the template files used are also used in other ways, so the documentation wouldn't apply.\]
The databases are:
Bsa.db (load once for each BSA PV, or use as a template with 1 line per BSA PV)
EvrPmc.db (Load once for each EVR in the system, usually 1)
Pattern.db (Load once per IOC)
*-trig.db (flavors are PMC-trig.db, VME-trig.db, and VME-TTB-trig.db. Load for each piece of hardware, e.g. for a PMC on the VME processor board with rear transition board load PMC... and VME-TTB...)
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