Database Insights

Use ClickHouse for sub-second analytics on billions of rows. Covers MergeTree table engine, LowCardinality types, AggregatingMergeTree materialized views, and MySQL ingestion.

PostgreSQL's logging system is powerful but requires careful configuration to be useful in production. Learn how to capture slow queries, connection events, and DDL changes without drowning in noise.

Implement PostgreSQL declarative range partitioning with partition pruning, propagated indexes, instant DETACH for archival, and pg_partman for automated partition management.

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.

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.

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.

Use pg_repack to reclaim PostgreSQL table bloat without the exclusive lock of VACUUM FULL. Covers installation, table vs index repack, disk space requirements, and throttling.

Tune the InnoDB buffer pool for maximum MySQL performance. Covers sizing to 70-80% RAM, monitoring hit ratio, dynamic resize, warm-up on restart, and pollution prevention.

Choose the right Cassandra compaction strategy: STCS for write-heavy workloads, LCS for read-heavy point lookups, and TWCS for time-series data with TTL-based expiry.

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

Implement PostgreSQL full-text search with tsvector columns, GIN indexes, and ts_rank scoring. Covers phrase search, weighted fields, and ts_headline snippets.