ClickHouse Common Errors

Overview

Quick reference for the top 10 most common ClickHouse errors and their solutions.

Prerequisites

• ClickHouse SDK installed
• API credentials configured
• Access to error logs

Instructions

Step 1: Identify the Error

Check error message and code in your logs or console.

Step 2: Find Matching Error Below

Match your error to one of the documented cases.

Step 3: Apply Solution

Follow the solution steps for your specific error.

Output

• Identified error cause
• Applied fix
• Verified resolution

Error Handling

Authentication Failed

Error Message:

Authentication error: Invalid API key

Cause: API key is missing, expired, or invalid.

Solution:

# Verify API key is set
echo $CLICKHOUSE_API_KEY

Rate Limit Exceeded

Error Message:

Rate limit exceeded. Please retry after X seconds.

Cause: Too many requests in a short period.

Solution:

Implement exponential backoff. See clickhouse-rate-limits skill.

Network Timeout

Error Message:

Request timeout after 30000ms

Cause: Network connectivity or server latency issues.

Solution:

// Increase timeout
const client = new Client({ timeout: 60000 });

Examples

Quick Diagnostic Commands

# Check ClickHouse status
curl -s https://status.clickhouse.com

# Verify API connectivity
curl -I https://api.clickhouse.com

# Check local configuration
env | grep CLICKHOUSE

Escalation Path

1. Collect evidence with clickhouse-debug-bundle
2. Check ClickHouse status page
3. Contact support with request ID

Resources

• ClickHouse Status Page
• ClickHouse Support
• ClickHouse Error Codes

Next Steps

For comprehensive debugging, see clickhouse-debug-bundle.