Database Insights

Understand RDS Multi-AZ for HA and Read Replicas for read scaling — failover behavior, replication lag, and costs

Use Aurora Serverless v2 for cost-effective scaling — ACU configuration, scaling behavior, and when it fits

Configure Redis Cluster for horizontal scaling — hash slots, replication, failover, and client-side routing

Design MongoDB sharded clusters — choose shard keys, manage chunk balancing, and avoid hot shards in production

Configure pgBouncer correctly for your PostgreSQL workload. Compare transaction vs session pooling, size your pool correctly, and monitor pool health in production.

Right-size your PostgreSQL connection pool using the (cores*2)+1 formula. PgBouncer configuration, per-user limits, pool saturation monitoring, and transaction mode pitfalls.

Enable and tune PostgreSQL parallel query for analytical workloads. Covers max_parallel_workers settings, PARALLEL SAFE functions, JIT compilation, and execution plan verification.

Compare database sharding strategies: hash sharding for even distribution, range sharding for locality, and directory-based for flexibility. When to shard and alternatives.

DynamoDB and MongoDB are the two most common NoSQL choices, but cost structures, query flexibility, and operational overhead differ dramatically depending on your access patterns.

Deploy and operate a Redis Cluster with automatic sharding and HA. Covers 6-node setup, health checks, adding master nodes, resharding, and manual failover.

Configure MySQL Group Replication (MGR) with Paxos-based consensus for fault-tolerant clustering. Covers prerequisites, bootstrap, joining nodes, and health monitoring.

Set up PgBouncer in transaction pooling mode to handle thousands of PostgreSQL connections. Configuration, monitoring with SHOW POOLS, and common pitfalls.