Instances are the collection of information stored at a particular moment. The instances can be changed by certain CRUD operations as like addition, deletion of data. It may be noted that any search query will not make any kind of changes in the instances.
Let’s say a table teacher in our database whose name is School, suppose the table has 20 records so the instance of the database has 20 records for now and tomorrow we are going to add another fifty records so tomorrow the instance have total 100 records. This is called an instance.
Schema is the overall description of the database. The basic structure of how the data will be stored in the database is called schema.
Let’s say a table teacher in our database name school, the teacher table require the name, dob, doj in their table so we design a structure as :
Teacher tablename: String doj: date dob: date
Above given is the schema of the table teacher.
Difference between Schema and Instance :
It is the overall description of the database.
Schema is same for whole database.
Does not change Frequently.
Defines the basic structure of the database i.e how the data will be stored in the database.
It is the collection of information stored in a database at a particular moment.
Data in instances can be changed using addition, deletion, updation.
It is the set of Information stored at a particular time
#DBMS #Schema #Instance #Probyto #ProbytoAI
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