Query optimization in Wordpress - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is query optimization in WordPress?

Query optimization means making database queries faster and use less resources. It helps your website load quicker and handle more visitors smoothly.

beginner

Why should you avoid using SELECT * in WordPress queries?

Using SELECT * fetches all columns, which can slow down the query. It's better to select only the columns you need to reduce data load and speed up the query.

intermediate

How does caching improve query performance in WordPress?

Caching stores query results temporarily so WordPress doesn't have to run the same query again. This reduces database load and makes pages load faster.

intermediate

What is the role of indexes in WordPress database query optimization?

Indexes help the database find data faster, like a book's index helps you find a topic quickly. Adding indexes on columns used in queries speeds up data retrieval.

beginner

Name a WordPress function that helps you write optimized queries.

The <code>WP_Query</code> class helps you build efficient and flexible queries with parameters to limit results, order data, and avoid unnecessary database load.

Which of these improves WordPress query speed the most?

A Selecting only needed columns

B Using SELECT * in queries

C Running queries on every page load without caching

D Ignoring database indexes

Selecting only needed columns reduces data load and speeds up queries.

What does caching do in WordPress query optimization?

A Deletes old data from the database

B Runs queries multiple times

C Slows down page loading

D Stores query results to reuse later

Caching stores query results temporarily to avoid running the same query repeatedly.

Which WordPress class helps build optimized database queries?

A WP_Post

B WP_Query

C WP_Comment

D WP_User

WP_Query is designed to create efficient and flexible database queries.

What is the benefit of adding indexes to database columns?

A Deletes duplicate data

B Increases database size

C Makes data retrieval faster

D Prevents data from being saved

Indexes help the database find data faster, improving query speed.

Which practice should you avoid for better query optimization?

A Using SELECT * in queries

B Using caching plugins

C Selecting only needed fields

D Limiting query results

Using SELECT * fetches all columns and slows down queries.

Explain how caching helps improve WordPress query performance.

Think about how repeating the same work can be avoided.

Describe why adding indexes to database columns can speed up queries in WordPress.

Imagine looking up a topic in a book quickly.