Bolt
database
Database Query Timeout - Complex Queries Too Slow
Database queries timeout or take too long (>5 seconds). Complex queries with joins or aggregations are slow.
API endpoints that query database time out or users see loading spinners for too long.
Error Messages You Might See
Query execution timeout after 30 seconds
Database connection timeout
Slow query warning: exceeded 1 second
Database lock timeout
Common Causes
- Missing database indexes on frequently queried columns
- N+1 queries - fetching parent then all children separately
- Fetching more data than needed (select * instead of specific columns)
- Complex joins without proper indexes
- Large result sets without pagination
How to Fix It
Add indexes: CREATE INDEX idx_user_email ON users(email)
Use eager loading: Prisma.findUnique({ include: { posts: true } }) instead of separate queries
Select specific fields: select { id: true, email: true } instead of full objects
Paginate large results: limit 100, offset (page-1)*100
Profile queries: explain analyze SELECT... in database
Cache frequently accessed data: use Redis for hot data
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Get HelpFrequently Asked Questions
How do I know if a query is slow?
Run EXPLAIN ANALYZE in database. Look for sequential scans (bad) vs index scans (good)
What's N+1 query problem?
Fetch 1 user (1 query), then fetch posts for each user (N queries). Use eager loading to do 2 queries total
Should I cache everything?
No, cache hot data. Use Redis for frequently accessed, slow-to-compute results. Set reasonable TTL