What is multiple instance database?

Question

We need to provide extra securty layer between databases. Multiples instances give us the ability to spread load over more than one TempDB. Databases are stored in separate SQL intances which are more secured and very well protected from one another. They don't interfere with each other.

Can one database have multiple instances?

It appears as though you cannot have multiple databases running under one instance. Without OPS or RAC, you must have one instance for each database if you want to access data in that database. However, it is possible to access another database's data through an instance by using Database Links.

What is instance database?

A database instance is a set of memory structures that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database.

Why do we need multiple instances?

A second area in which multiple instances provide great benefit is server consolidation. Instead of having 10 machines to run 10 applications, a company can run all applications on one machine. With separate SQL Server instances, each application can still have its own administrator and its own users and permissions.

How do you create multiple instances of database?

Creating a Database for a Multi-instance Environment.1Start Server Manager.2Connect with SYSDBA privileges.3Start up an instance with the NOMOUNT option.4Issue the CREATE DATABASE statement.5Create additional rollback segments and threads, as needed.6Close and dismount the database.14 Creating a Database & Objects for Multiple Instances

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