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When would you use more than one database?
In practice many systems use multiple databases. They are introduced for many reasons, for example, to scale up the system, to separate data belonging to different applications, to simplify debugging and maintenance, or to add an application that requires a different data manager product.
What do you call multiple databases?
This could be what is often considered a clustered database. But some people equate one database user account, and all of it’s owned database objects, to be a database. Oracle calls these schemas and a single database instance can have many, many different schemas. So in that case, it would be a database instance.
Is it better to have one database or multiple databases?
That way you can have a bunch of small clients in one database and the big ones on separate servers. A key factor for maintainability though, is that you keep the schema identical in all databases. There will be headache enough to manage the versioning without introducing client specific schemas.
What happens when you have multiple customers in one database?
Add : One more issue – with multiple customers in a single database, every SQL query is going to need to ensure that the data for the correct customer is chosen. That means that the SQL is going to be harder to write, and read, and the DBMS is going to have to work harder on processing the data, and indexes will be bigger, and
Why are multiple schemas better than multiple databases?
The administrative work is simplified because no database links are required, and application code is simplified because no error trapping need exist to handle the unavailability of the VENDORS table.
Are there any solid arguments against multiple databases?
Arguments against multiple databases: Use schemas to separate domains. None of performance, stability, optimization are true. Does anyone have a solid argument or reference article why these would be true?