What is a Database instance ? Explain

Answer:

 

A  database  instance  (Server) is a set of memory structure and background processes that access a set of database files.

 

The process can be shared by all users.

 

The  memory  structure  that  are  used  to  store  most  queried data from database.  This  helps up to improve database performance by decreasing the amount of I/O performed against data file.