Database Insights

Redis Sentinel and Redis Cluster both provide HA, but teams regularly choose the wrong one. Sentinel is simpler and covers 95% of use cases; Cluster is required for horizontal scale. Here's when to choose each.

Build a production database DR runbook covering RTO/RPO definitions, failover steps, PITR recovery commands, and a verification checklist. Test it quarterly.

Design multi-region database topologies for global latency and DR. Compares active-passive, Aurora Global Database replication, and application-level read routing patterns.

Upgrade PostgreSQL major versions with sub-second downtime using logical replication. Step-by-step guide covering schema copy, subscription setup, lag monitoring, and sequence resync.

Compare Redis persistence modes: RDB snapshots for fast restarts, AOF for sub-second durability, and the combined RDB+AOF approach. Includes data loss and I/O tradeoff matrix.

Aerospike 7.0 delivers 1 million writes per second with sub-millisecond latency using its Hybrid Memory Storage architecture. Learn when Aerospike beats Redis and Cassandra, and how to configure it for production.

MySQL 8.4 GTID replication eliminates binlog position tracking and makes failover deterministic. Learn to configure GTID mode, initialize replicas correctly, and use Orchestrator for automated failover.

MySQL InnoDB Cluster combines Group Replication, MySQL Shell, and MySQL Router into a complete HA solution. Here's how to deploy and manage it in production.

Logical replication in PostgreSQL has a critical gap: slots do not survive failover. PostgreSQL 17 finally fixes this with failover slots, plus adds row and column filtering for selective replication.

MySQL Group Replication and Galera Cluster both promise multi-primary high availability, but they behave very differently under load, network partitions, and node failures.

Understand the difference between RDS Multi-AZ and Read Replicas. Decision matrix covering HA, read scaling, Aurora cluster behavior, and cross-region DR.

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