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  1. Categories >> ERRORS >> Database Errors >> Oracle Errors
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ORA-01100: database already mounted

Question Posted / harbai computer education

Answer Posted / harbai computer education

ORA-01100: database already mounted

First off, what Oracle calls a "database" is generally different than what most other database products call a "database". A "database" in MySQL or SQL Server is much closer to what Oracle calls a "schema" which is the set of objects owned by a particular user. In Oracle, you would generally only have one database per server (a large server might have a handful of databases on it) where each database has many different schemas. If you are using the express edition of Oracle, you are only allowed to have 1 database per server. If you are connected to Oracle via SQL Developer, that indicates that you already have the Oracle database created.

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