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What is DNS propagation?
DNS propagation is the time required for DNS changes to update across internet servers worldwide.
Quick Answer: DNS propagation usually happens because different DNS resolvers cache old records
for a specific TTL period before fetching the new value.
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What is MySQL indexing?
Quick Answer: MySQL indexing helps the database find rows faster without scanning the full table.
It improves SELECT query speed when used on searchable columns.
Simple Explanation
A MySQL index works like a book index. Instead of checking every row, MySQL uses the index to quickly locate matching records.
Best Usage
Use indexes on columns used in WHERE, JOIN, ORDER BY, and search filters such as email, user_id, category_id, status, or created_at.
CREATE INDEX idx_email ON users(email);