BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Over 500 Tables ?          BorlandTalk.com Forum Index -> C++ Builder Databases (Multi-Tier) View previous topic :: View next topic   Author Message Sasan Guest Posted: Wed Oct 05, 2005 10:25 am    Post subject: Over 500 Tables ? Hello, I use SQL-Serevr for my database application, i have more than 500 tables and split it in 2 databases, i want know may be this design decrease application speed ? Best Regards, M.T Back to top Giuliano Guest Posted: Wed Oct 05, 2005 10:57 am    Post subject: Re: Over 500 Tables ? On Wed, 5 Oct 2005 13:55:14 +0330, "Sasan" <sasan_vm (AT) yahoo (DOT) com> wrote: Quote: Hello, I use SQL-Serevr for my database application, i have more than 500 tables and split it in 2 databases, i want know may be this design decrease application speed ? If you are creating relations (making queries), using objects from both databases, you could to experiment degraded performances. Normally, this kind of queries are called "heterogeneous queries". AFAIK, server's optimizers (even if databases are owned by the same server), don't play very much with relations coming from different databases (database = groups of tables, views, stored procedures, rules, etc etc). Moreover, if you are using databases' access technologies like ADO, is possible that some parts of yours join, they could be made "locally". If so, the network traffic is unavoidably increased 'cause amount of transmitted data isn't reduced at server side. Only the server has "intimate" semantics of structure (schema) you have created in the database. Again, AFAIK, it's not possible to have referential integrity between different databases, so I suggest you, if it's possible, "to reduce" (denormalize) your database schema, and put all your objects (tables, views, stored procedures, etc etc) in the same place. Best regards. 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