ClickHouse outage history and postmortems
Data and observability · 18 incidents in 90 days · 99.55% implied uptime · last 24h ago
Incidents
27 on fileAbout ClickHouse
The real-time analytics database and ClickHouse Cloud.
The last year, day by day
Downtime, added up
ClickHouse: 9h 43m weighted downtime in range, category median 2h 1m.
18 incidents, 3 major or critical, 2d 10h of incident time (32h 34m major or critical, 26h 15m partial), longest 29h 46m, implied uptime 99.55%, between Jun 28, 2026 and Sep 25, 2026.
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Questions
Is ClickHouse down right now?
Check ClickHouse's own status page at https://status.clickhouse.com for the live state. This page shows ClickHouse's incident history from that page; the most recent incident started 2026-09-24: "Streaming ClickPipes degradation in AWS eu-central-1 region".
How often does ClickHouse have outages?
ClickHouse posted 18 incidents in the last 90 days and 27 in the last year, 3 of them major or critical in the last 90 days. The median incident lasted 2h 10m.
When was ClickHouse's last major outage?
2026-09-15: "ClickPipes failing on Kinesis in AWS us-east-1", lasting 29h 46m.
What usually causes ClickHouse incidents?
Where ClickHouse explained the cause, the most common was capacity and load (3 incidents). Most status updates do not name a cause.
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.