SEMS Database Discipline: Engineering There are multiple tables of data necessary in SEMS. These will primarily live on site, but will be replicated back to SBA. The different tables are: Internal instrument data: Data recorded from LCOGT-run instruments. External environment data: Data read from external instruments, websites, or feeds that has been used by LCOGT. Event logging: Explanation of a site change of status, what factors led to the decision. Tags: semsdatabasemysql