How the Buffer Pool Anchors the Memory Hierarchy

Choosing an Eviction Policy: LRU, CLOCK, and Workload-Aware Variants

Pinning and Concurrency: Making Eviction Safe at Scale

Dirty Page Management: Flushing, Checkpoints, and WAL Discipline

Prefetching, Read-Ahead, and OS Cache Interaction

Practical Application: Instrumentation, Tuning, and Operational Checklists

Buffer management is where microseconds become minutes: the buffer pool turns persistent I/O into in-memory work or it becomes the throttle that kills p99. Get eviction, pinning, and dirty-page flushing wrong and the storage layer will be the single largest source of unpredictable latency in production.

You see this problem in three ways: stealthy tail-latency spikes during heavy scans or checkpoints, I/O storms when the evictor chases dirty pages, and persistent memory bloat because kernel and engine caches duplicate the same bytes.…