Real questions on indexing, execution plans, ACID anomalies and outbox patterns. Each one carries the senior answer and the reply that costs you the offer.
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The tested senior response and the What-To-Say / What-Not-To-Say battlecard unlock when your enrolment is approved.
Unlock full accessAnswer, production scenario and battlecard locked
The tested senior response and the What-To-Say / What-Not-To-Say battlecard unlock when your enrolment is approved.
Unlock full accessAnswer, production scenario and battlecard locked
The tested senior response and the What-To-Say / What-Not-To-Say battlecard unlock when your enrolment is approved.
Unlock full accessContrast DELETE, TRUNCATE, and DROP across transaction rollback capability, triggers, and space deallocation.
DELETE is a DML command that removes rows conditionally, fires table triggers, logs each row removal to WAL/redo logs, and can be rolled back. TRUNCATE is a DDL command that deallocates all data pages immediately, resets auto-increment sequences, does NOT fire individual row triggers, logs only page deallocations (vastly faster), and can be rolled back in PostgreSQL (not in MySQL). DROP is a DDL command that deletes both the data and the schema catalog definition, dropping all associated indexes and constraints.
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