Embedded TSDB Overview

What It Is

The ProxySQL TSDB is an embedded SQLite-based time-series store implemented in ProxySQL_Statistics. It records Prometheus metrics and optional backend TCP probe health into statsdb_disk.

What It Currently Implements

• Storage in SQLite tables:
  • tsdb_metrics (raw samples)
  • tsdb_metrics_hour (hourly rollups)
  • tsdb_backend_health (backend probes)
• Periodic sampling from the built-in Prometheus registry.
• Sampling of all Prometheus metric families:
  • Counter, Gauge, Summary, Histogram, Info, Untyped.
• Optional backend TCP probe loop for runtime_mysql_servers.
• Hourly downsampling and retention cleanup.
• Query access via SQL on statsdb_disk.* tables.

Configuration Model

TSDB settings are standard global variables with the tsdb- prefix. They can be managed via standard SET commands or through the dedicated TSDB command set:

• SET tsdb-...
• LOAD TSDB VARIABLES TO RUNTIME
• SAVE TSDB VARIABLES TO DISK
• SHOW TSDB VARIABLES
• SHOW TSDB STATUS

UI and REST API

A built-in dashboard is available at /tsdb on the ProxySQL HTTP Server (default port 6080). It provides a simple visualization of collected metrics.

REST API endpoints are available under /api/tsdb/ for external integrations.

Variables

• tsdb-enabled (0/1)
• tsdb-sample_interval (1..3600 seconds)
• tsdb-retention_days (1..3650)
• tsdb-monitor_enabled (0/1)
• tsdb-monitor_interval (1..3600 seconds)

Retention

• Raw metrics (tsdb_metrics): tsdb-retention_days
• Backend probes (tsdb_backend_health): tsdb-retention_days
• Hourly rollups (tsdb_metrics_hour): fixed 365 days