Disk I/O and Checkpoint Tuning
Tune disk I/O behavior and checkpoint settings to reduce write spikes and improve overall system responsiveness.
Disk I/O & Performance
Disk Input/Output (I/O) is a critical factor for PostgreSQL performance. It refers to how fast your database can read and write data to storage.
Slow disk I/O often becomes a major bottleneck, leading to slower query execution and overall system unresponsiveness.
Understanding and tuning I/O-related settings is key to a high-performing PostgreSQL instance.
Understanding Checkpoints
A checkpoint is a crucial process in PostgreSQL that ensures data durability and helps with crash recovery.
During a checkpoint, all "dirty" data pages (data that has been changed in memory but not yet written to disk) are flushed from the shared_buffers to the data directory on disk.
This guarantees that at least up to the checkpoint, all committed changes are safely stored on persistent storage.
All lessons in this course
- postgresql.conf Key Parameters
- Memory (shared_buffers, work_mem) Tuning
- Disk I/O and Checkpoint Tuning
- Tuning the Query Planner Cost Constants