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Hectal
Phase 17Advanced18 of 18 in Database Design

Interview Preparation and Hands-On Labs

The database case-study template, a 36-question interview bank with model answers, a schema design problem bank from library to multi-tenant SaaS, hands-on PostgreSQL labs, the Java/Spring build track, and 30- and 60-day study plans.

Use this phase to rehearse. Answer each question aloud before reading the model answer, and time yourself on design problems using the case-study template.

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5 topics ~37 min 6 code blocks & diagrams
Start with the first topic
1
17.1

The Database Case-Study Template

A fixed structure for any database design answer: requirements, scale, entities, schema, normalization, access patterns, indexes, transactions, scaling, cache, failure, backup and DR, security, and cost, ending with trade-offs. It keeps you from skipping the parts interviewers score most: numbers, invariants and failure handling.

8 min 1 code practice

2
17.2

Question Bank: Fundamentals, Transactions and Indexes

Eighteen high-frequency questions on modeling, keys, normalization, ACID, isolation, locking, MVCC, B-trees and index design, each with a concise model answer you can deliver in about a minute.

6 min 1 code practice

3
17.3

Question Bank: Scaling, Distributed Systems and Production

Eighteen questions on replication, sharding, hot partitions, CAP and PACELC, quorums, consistency, outbox and CDC, zero-downtime migrations, backups, RPO/RTO and monitoring, with model answers aimed at senior-level depth.

6 min 1 code practice

4
17.4

Design Problem Bank: From Library to Multi-Tenant SaaS

Graded schema design problems with the key insight each one tests. Beginner problems test entities, keys and constraints; intermediate ones test concurrency, inventory and time ranges; advanced ones test ledgers, feeds, sharding, multi-tenancy and polyglot pipelines.

8 min 1 code practice

5
17.5

Hands-On Labs, Java Build Track and Study Plans

Knowledge sticks when you break things yourself. Run the PostgreSQL labs (plans, deadlocks, isolation, MVCC, VACUUM, partitioning, backup and restore, replication), build the Java/Spring track (locking, pagination, outbox, idempotency, caching, CDC, read-replica routing, multi-tenancy, zero-downtime migration), and follow a 30-day intensive or 60-day deep plan, finishing with the readiness checklist.

9 min 2 code practice