Question 1

What is database observability?

Accepted Answer

Database observability is the ability to understand the internal state of your database systems by analyzing query performance, engine metrics, and infrastructure signals. Unlike basic monitoring which checks metrics against static thresholds, observability helps you understand why problems occur by correlating signals across multiple layers.

Question 2

How is QueryComment different from Datadog?

Accepted Answer

Datadog offers broad infrastructure monitoring with database support as one feature among many. QueryComment is purpose-built for database observability, providing cross-layer causal correlation between query regressions, engine-level issues (like autovacuum delays or buffer pool misses), and infrastructure changes. It detects silent degradation before threshold-based alerts fire.

Question 3

Which databases does QueryComment support?

Accepted Answer

QueryComment supports PostgreSQL and MySQL, including managed platforms like Supabase, Neon, Aurora, AlloyDB, PlanetScale, AWS RDS, and GCP Cloud SQL.

Question 4

What is silent degradation?

Accepted Answer

Silent degradation is when database performance gradually worsens — a query getting 3ms slower per day, an index slowly bloating, buffer cache hit ratio dropping 0.1% daily — without triggering any alert threshold. By the time a static alert fires, users have been affected for days or weeks. QueryComment detects these trends proactively.

Question 5

How does cross-layer correlation work?

Accepted Answer

QueryComment collects metrics from three layers — query performance, database engine internals, and infrastructure (CPU, memory, I/O, network). Its reasoning engine correlates anomalies across layers to build causal chains: e.g., "this query got slow because autovacuum was delayed due to a long-running transaction, which caused table bloat, which caused sequential scans."

Question 6

Is QueryComment free?

Accepted Answer

QueryComment is currently in early access. Sign up for free to get early access to the platform.

Database Observability for PostgreSQL & MySQL