Cursor performance

Database Query Performance Degraded

After Cursor refactored your database query code, certain queries have become significantly slower. Page loads that were previously fast now timeout or feel laggy.

The generated queries are inefficient or missing important indexes.

Error Messages You Might See

Query timeout Slow query detected Connection timeout Too many rows returned
Query timeoutSlow query detectedConnection timeoutToo many rows returned

Common Causes

  1. Removed index on frequently filtered column
  2. Changed query structure to avoid index (e.g., function on indexed column)
  3. Added unnecessary JOINs or subqueries
  4. Changed from prepared statements to concatenated queries
  5. Missing LIMIT clause fetching entire result set

How to Fix It

Analyze query with EXPLAIN: EXPLAIN ANALYZE SELECT .... Look for sequential scans that should be index scans. Add indexes: CREATE INDEX idx_name ON table(column). Verify prepared statements used. Add LIMIT to prevent full table scans.

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Frequently Asked Questions

How do I identify slow queries?

Enable slow query log. Use EXPLAIN ANALYZE. Check application logs for query duration.

When should I add an index?

On columns used in WHERE, JOIN, ORDER BY. Not on columns with low cardinality. Test improvement vs write cost.

Related Cursor Issues

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