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If I was, for example, going to count ‘activities’ across many computers and show a rollup of that activity, what would the database look like to store the data?
Simply this? Seems too simple. I’m overthinking this.
ACTIVITYID COUNT ---------- -----
If the volume is not going to be ridiculously large, I’d probably create a table that logs each event individually, with a DateTime as @Turnkey suggests, and possibly the machine that logged it, etc.
That would give you the ability to run a query to get the current count, and also to use the data to determine events in a time period, and/or coming from a specific machine. A clustered index on ActivityID should give you good query performance, and the table is narrow so inserts shouldn’t be too costly.