QuestDB · Rate Limits

Questdb Rate Limits

QuestDB does not enforce a managed-service-style request quota. As a self-hosted database, the relevant limits are operational: max concurrent HTTP/PG connections, ILP TCP buffer/queue depth, query timeouts, and per-server CPU/IO budgets. Limits are configurable via server.conf.

Questdb Rate Limits is the machine-readable rate-limit profile for QuestDB on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 4 rate-limit definitions, measuring workers, connections, and ms.

The profile also includes 2 backoff/retry policies defined and response codes documented for busy.

Tagged areas include Database, Time-Series, SQL, Open Source, and Performance.

4 Limits
DatabaseTime-SeriesSQLOpen SourcePerformanceRate LimitingQuotasThrottling

Limits

HTTP REST default workers server
workers
see http.worker.count in server.conf
Default tuned to host CPU; controls request concurrency on port 9000.
Postgres wire connections server
connections
see pg.net.connection.limit in server.conf
Default 64 connections on port 8812.
ILP TCP connections server
connections
see line.tcp.net.connection.limit in server.conf
Default 256 ILP TCP connections on port 9009.
Query timeout server
ms
see query.timeout.sec in server.conf
Long-running queries are terminated server-side.

Policies

Backoff Strategy
ILP HTTP clients should retry on 5xx with exponential backoff; ILP TCP clients should buffer and reconnect on disconnect.
Capacity Planning
Size workers, RAM and disks per QuestDB capacity-planning guide; no managed throttling.

Sources

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/questdb-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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