Indexes Usefulness

Indexes in databases are like the indexes in books. They increase the speed of data retrieval from a database. When you want to read data from a table, instead of going through all the rows of the table, indexes help to go straight to the row you are looking for.

They improve SELECT queries, improve performance, and make sorting and filtering faster. They also ensure data integrity. There are different types of indexes, which include:

• B-Tree index
• Composite index
• Unique index
• Full text index
• Bitmap index
• Clustered index
• Non-clustered index