one database many?


i am building website control information churned entities. information common between entities, nonetheless competence owned same customer. fan competence wish control entities unparalleled "dashboard". should i have database everything, keep information seperated sole databases?
is there best-practice? positives/negatives carrying a:




  • database whole site (entity
    has "customerid", information has
    "entityid")

  • database each
    customer (data "entityid")

  • database any entity (relation of
    database fan outmost of
    database)



multiple databases seems have improved opening (fewer rows joins) nonetheless competence eventually spin maintain nightmare.



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