35 lines
1.0 KiB
Markdown
35 lines
1.0 KiB
Markdown
---
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title: Clear, Action-Oriented Title (e.g., "Use Partial Indexes for Filtered Queries")
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impact: MEDIUM
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impactDescription: 5-20x query speedup for filtered queries
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tags: indexes, query-optimization, performance
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---
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## [Rule Title]
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[1-2 sentence explanation of the problem and why it matters. Focus on performance impact.]
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**Incorrect (describe the problem):**
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```sql
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-- Comment explaining what makes this slow/problematic
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CREATE INDEX users_email_idx ON users(email);
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SELECT * FROM users WHERE email = 'user@example.com' AND deleted_at IS NULL;
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-- This scans deleted records unnecessarily
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```
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**Correct (describe the solution):**
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```sql
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-- Comment explaining why this is better
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CREATE INDEX users_active_email_idx ON users(email) WHERE deleted_at IS NULL;
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SELECT * FROM users WHERE email = 'user@example.com' AND deleted_at IS NULL;
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-- Only indexes active users, 10x smaller index, faster queries
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```
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[Optional: Additional context, edge cases, or trade-offs]
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Reference: [Postgres Docs](https://www.postgresql.org/docs/current/)
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