如果hr数据库仍然存在，如何在oracle sql developer中创建新数据库？

Question

I have already hr database in my Oracle sql. I want to make another database in Oracle sql developer and i also want hr database to be still present. please suggest me how to solve this

Answer 1

Perhaps you come from an environment like Microsoft Access where you have many databases floating around. In Oracle you only have one database, which has (possibly) many "schemas". All the tables are part of one big database, but each table (and other objects) has only a (usually smaller) subset of users who are allowed access to it.

HR in Oracle is not a database, it is only a schema. Your database already has other schemas, for example sys.

To create a new schema, you actually create a new USER. (Probably for yourself - call it dinesh . You use the create user command, while logged in as sysdba. Then you log in as dinesh and start building your schema (create tables, etc.) You can use SQL Developer to copy tables from HR or from scott (another standard schema), or you can even "clone" (copy) an entire schema to your own. It would be best if you read the Oracle documentation for all of this.

https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_8003.htm https://docs.oracle.com/cd/E11882_01/server.112/e10897/users_secure.htm#ADMQS007