LAB-01
Abdul Moiz
Awan
21-02-2024
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Database System Lab
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Sir Hamza Bhatti
Database:
A database is an organized collection of structured information or data.
Types of Databases:
There are two basic types which are:
1. SQL
2. NoSQL
SQL:
It is a structure query language and is used for processing information in
relational databases. In SQL the data is in tabular form.
SQL Databases:
1. Microsoft SQL Server:
2. Oracle: It is one of the best SQL databases which helps to manage data and prevent
security breaches.
3. MySQL
NoSQL:
NoSQL normally collects unstructured data. It uses a variety of data models
for accessing and managing data. They are not in tabular form instead they are
horizontally scalable.
NoSQL Databases:
1. MongoDB
2. Redis (Faster than MongoDB)
3. Cassendra
Relational Databases:
It is a type of database that stores and provides access to data points that are related to one
another.
Non-Relational Databases:
It is a type of database that doesn’t use the tabular schema of rows and columns.
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ACID:
It refers to four key properties:
A Atomicity:
Entire Transaction takes place at once or doesn’t happen at all.
C Consistency: Database must be consistent before and after the transaction.
I Isolation:
Multiple transaction occurs independently without any interference.
D Durability:
A successful transaction can still take place despite a system failure.
Transaction:
It is a sequence of one or more operations, such as insertions, updates, or deletions,
performed on a database as a single unit of work.
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