Databases
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POWhat is better: to have many similar databases or one database with similar tables or one database with one table?
 

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    <p>I need to work with several data samples, to say, <code>N</code>. The samples represent similar data but from different origins. For example, history of order in different shops. So the structure of all the samples is the same. To operate with the data I have several possibilities:</p> <ol> <li><p>Use <code>N</code> databases with identical schema, one for each sample</p></li> <li><p>Use one database, but <code>N</code> sets of tables. For example, User_1,..., User_N; Product_1, ..., Product_N, Order_1, ..., Order_N and so on.</p></li> <li><p>Use one database with one set of tables User, Product, Order, but add to each table a helper column which represents a sample index. Clearly, this column should be an index.</p></li> </ol> <p>The last variant seems to be the most convenient for use because all queries become simple. In the second case I need to send a table name to a query (stored procedure) as a parameter (is it possible?).</p> <p>So which way would you advise? The performance is very important.</p>
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