database - why are multiple DBs actually needed? -

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i looking @ godaddy.com says offer 10 mysql dbs, don't know why need more 1 ever since db can have mutliple tables. can't multiple dbs integrated single db? there example case better or unfeasible not have multiple ones? , how differentiate between them when want call them, directory or name?

best,

i guess separation of concerns obvious answer. in same way can have of functionality in 1 humongous class in object oriented programming, it's idea keep non-related information separate. it's easier wrap head around smaller chunks of data, , future developers mights start think tables related, , aggregate data in way never meant to.


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