Database Insights

Design multi-tenant databases — compare schema-per-tenant, row-level-security, and database-per-tenant approaches

Compare Liquibase and Flyway for schema migration management — features, abstraction level, and team fit

Apply DynamoDB advanced patterns — GSI overloading, sparse indexes, single-table design, and access pattern modeling

Model data in Cassandra around query patterns — partition key design, clustering columns, and anti-patterns to avoid

Compare Liquibase and Flyway for production database schema management. Learn changelog formats, rollback strategies, team workflows, and CI/CD integration patterns.

Understand when MySQL JSON columns help and hurt performance. Learn functional indexes, JSON_TABLE, and when to migrate JSON to normalized columns.

MySQL's foreign key implementation has evolved significantly from 5.7 through 8.4 — with changes to metadata locking, instant DDL interactions, and Group Replication behavior that every DBA needs to understand.

Use MySQL JSON columns effectively with path operators, functional indexes via generated columns, JSON_CONTAINS filtering, and partial updates with JSON_SET.

Design Cassandra tables around query patterns, not entities. Covers partition key cardinality, hot partition prevention, time bucketing, and secondary indexes vs materialized views.

Compare three PostgreSQL multi-tenant patterns: shared schema with RLS, schema-per-tenant, and database-per-tenant. Includes hash partitioning for shared schema at scale.

Apply GitOps principles to database changes — PR-based schema reviews, automated migrations, and rollback strategies

UUIDs as primary keys can destroy database performance. Learn why 50M rows went from 0.5ms to 2.3ms inserts, and how to fix it with hybrid approaches.