What are the different types of indexes in Oracle?

Vaibhav Kothia May 26, 2023 0 Comments

1. Unique Index: A unique index is a type of index that ensures that all values stored in the index key are unique. For example, if you have a table with a column that stores employee IDs, you can create a unique index on that column to ensure that no two employees have the same ID.

2. Bitmap Index: A bitmap index is a type of index that uses a bitmap to store the index keys. Each bit in the bitmap corresponds to a value in the index key. For example, if you have a table with a column that stores gender (male or female), you can create a bitmap index on that column to quickly find all the males or females in the table.

3. Composite Index: A composite index is a type of index that is made up of multiple columns. For example, if you have a table with columns for first name, last name, and age, you can create a composite index on those three columns to quickly find all the records with a particular combination of first name, last name, and age.

4. Function-Based Index: A function-based index is a type of index that is based on a function or expression. For example, if you have a table with a column that stores dates, you can create a function-based index on that column to quickly find all the records with a particular date range.

5. Spatial Index: A spatial index is a type of index that is used to quickly find records that are related to a particular location. For example, if you have a table with columns for latitude and longitude, you can create a spatial index on those columns to quickly find all the records that are within a certain distance of a particular location.

What is Oracle Database and why is it used?

Vaibhav Kothia May 26, 2023 0 Comments

Oracle Database is an object-relational database management system (ORDBMS) developed by Oracle Corporation. It is used to store and manage data for large applications, web sites, and other distributed applications. Oracle Database is used to store, organize, and retrieve data in a secure and efficient manner. It is also used to create and manage databases for web applications, data warehouses, and other applications. For example, Oracle Database can be used to store customer information, product information, and financial data. It can also be used to create and manage databases for e-commerce websites, data warehouses, and other applications.