Programming Quote by Anonymous
““When you execute a program that retrieves a small subset of rows from a large table, it can be time-consuming for PROC SQL to read the rows sequentially. In some situations, using an index on a table allows PROC SQL to access a subset of rows more efficiently. An index stores unique values for a specified column or columns in ascending value order, and includes information about the location of those values in the table. That is, an index is composed of value/identifier pairs that enable you to access a row directly, by value. For example, suppose you have created an index on your table that is based””
About This Quote
Source Technical Documentation: PROC SQL Indexing Guide, SAS Institute, 2020
Indexes let databases locate rows quickly by storing sorted key‑value pairs, reducing scan time for queries.
In simple terms: Indexes speed up data retrieval by mapping keys to rows.
Key Takeaway
Use indexes to improve query performance.
Themes
databases
performance
SQL
Mood
analytical
practical
Type
technical
educational
When to use this quote
- large datasets
- reporting
- data analysis
- software development
Key Concepts
indexing
query optimization
Questions to Reflect On
- When should you add an index?
- What trade‑offs exist?
A Different Perspective
Indexes add overhead for writes and storage.
