Teach Cloud - Cloud, DevOps, and Python Backend Development Blog

❓ Quiz Question

Aug 30, 2026

Quiz: Which database isolation level prevents Dirty Reads but allows Non-Repeatable Reads?

Under Read Committed isolation, transactions can only view committed data, preventing uncommitted dirty reads.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

ROLLBACK reverts database modifications made since the last BEGIN TRANSACTION point.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

… when concurrent transactions acquire circular locks; database engines detect deadlocks and abort one of the transactions.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

EXPLAIN (or EXPLAIN ANALYZE ) shows how database engines execute queries, highlighting index usage and scan costs.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

… migration files; migrate applies pending migrations to the database.

#Django Web Framework #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

null=True is database-related (storing NULL values); blank=True is validation-related (allowing empty inputs in forms).

#Django Web Framework #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

… expressions reference model field values directly in database queries, preventing race conditions during atomic updates.

#Django Web Framework #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

… built-in automatic rotation workflows (using Lambda) for database and API credentials.

#AWS Cloud Services #Quiz #Interactive