The JusDB Database Engineering Blog

Build a complete database observability stack with Prometheus metrics, slow query logs, and OpenTelemetry distributed traces. Includes alert rules for replication lag and cache hit rate.

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.

Use MySQL Performance Schema to find top queries by total time, detect blocking transactions in real time, audit index usage, and analyze memory allocation.

Master pg_stat_statements for PostgreSQL query analysis. Find top queries by total time, detect plan instability via stddev, identify I/O-heavy queries, and track WAL generation.

Execute MySQL schema migrations safely with the expand-contract pattern, batched backfills, backward-compatible changes, and migration tooling comparison (Flyway, Liquibase, gh-ost).

ClickHouse MergeTree is why ClickHouse queries 1 billion rows in 0.3 seconds. Learn how parts, merges, and sparse indexes work, and how to choose the ORDER BY key, secondary indexes, and MergeTree variants.

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.

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

Understand why MySQL removed the query cache in 8.0 and what to use instead: application-level Redis caching, ProxySQL query cache, and pre-computed summary tables.

PostgreSQL 17 ships eager freezing and improved autovacuum prioritization, the most significant vacuum improvements in a decade. Learn how to tune autovacuum for high-write tables and prevent transaction ID wraparound.

Guide the PostgreSQL query planner with enable_xxx settings, pg_hint_plan extension, and extended statistics for correlated columns. Fix bad plans without rewriting queries.

Migrate MySQL schema changes online with gh-ost using binlog streaming instead of triggers. Covers dynamic throttling via Unix socket, postpone-cut-over flag, and test-on-replica mode.