Optimizing Database Performance Using Views and Indexes

Introduction

As e-commerce platforms grow rapidly, database systems must efficiently handle increasing numbers of customers, products, and transactions. A database administrator (DBA) plays a key role in ensuring the database performs well, remains secure, and supports business operations effectively.

Two important techniques DBAs use to improve database performance are indexes and views:

• Indexes speed up data retrieval.
• Views simplify complex queries and improve security.

By strategically implementing indexes and views, the overall efficiency and usability of the database system can be improved. As the database size increases, query optimization becomes essential for maintaining scalability and system responsiveness.

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A. How Indexes Improve Query Performance

According to Oracle (2005), indexes improve query performance by enabling the database management system to locate rows more quickly without scanning the entire table. In a rapidly growing e-commerce database, indexes are important because tables such as Orders and Products may contain thousands or millions of records.

Example 1: Orders Table

Customers often want to view their previous orders, and the system frequently searches orders by CustomerID. Without an index, the database would need to perform a full table scan, which slows as the table grows. Creating an index on CustomerID allows the database to retrieve matching orders much faster.

Example 2: Products Table

Customers commonly browse products by category, such as electronics or clothing. Queries filtering products by CategoryID are expected to be frequent. By creating an index on CategoryID, the database can quickly retrieve products in a specific category, improving the shopping experience for users.

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B. SQL Statements to Create Indexes

-- Index on Orders table (CustomerID column)
CREATE INDEX idx_orders_customer
ON Orders (CustomerID);

-- Index on Products table (CategoryID column)
CREATE INDEX idx_products_category
ON Products (CategoryID);

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C. How Views Can Be Helpful

Views are virtual tables created from SQL queries. They help simplify complex queries and improve security by restricting access to sensitive data.

Simplifying Order Reporting

In many situations, developers or staff members may need to retrieve order information along with customer details. Instead of repeatedly writing complex JOIN queries, a view can combine data from the Orders and Customer tables into a single virtual table. This makes queries easier to write and maintain.

Improving Security

The Customer table contains sensitive information such as passwords. Some employees may only need access to customer names and emails for customer service purposes. A view can hide sensitive columns and provide limited access to only the required information.

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D. SQL Statements to Create Views

-- 1. View: Order Summary (Joins Orders + Customers)
CREATE VIEW OrderSummaryView AS
SELECT
    o.OrderID,
    c.CustomerName,
    o.OrderDate,
    o.TotalAmount
FROM Orders o
INNER JOIN Customer c
    ON o.CustomerID = c.CustomerID;

-- 2. View: Public Customer Data (Hides sensitive fields)
CREATE VIEW CustomerPublicView AS
SELECT
    CustomerID,
    CustomerName,
    Email,
    Role
FROM Customer;

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E. Are These Views Updatable?

Views can be either updatable or non-updatable depending on their structure.

CustomerPublicView — Updatable

CustomerPublicView is considered updatable because it is based on a single table and does not contain aggregate functions or complex joins. Changes made through the view can be reflected directly in the Customer table.

OrderSummaryView — Non-Updatable

OrderSummaryView is considered non-updatable because it is created using a JOIN operation between multiple tables. The database management system may not be able to determine how updates should be applied across the related tables. For this reason, complex views involving multiple tables are usually treated as non-updatable.

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Conclusion

Indexes and views are important tools for optimizing database performance in a growing e-commerce platform:

• Indexes improve query speed by reducing full table scans and allowing faster data retrieval.
• Views simplify complex queries and help protect sensitive information by restricting access to selected columns.

By strategically implementing indexes and views, DBAs can improve system performance, maintain security, and support efficient database operations in modern business environments.

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References

1. Oracle. (2005). Using indexes and views for performance optimization. Oracle Documentation. https://docs.oracle.com/cd/B13789_01/appdev.101/b10795/adfns_in.htm
2. Vidhya, V., Jeyaram, G., & Ishwarya, K. (2016). Database management systems. Alpha Science International.