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40 lines
892 B
Markdown
40 lines
892 B
Markdown
# Indexing Principles
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> When and how to create indexes effectively.
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## When to Create Indexes
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```
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Index these:
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├── Columns in WHERE clauses
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├── Columns in JOIN conditions
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├── Columns in ORDER BY
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├── Foreign key columns
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└── Unique constraints
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Don't over-index:
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├── Write-heavy tables (slower inserts)
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├── Low-cardinality columns
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├── Columns rarely queried
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```
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## Index Type Selection
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| Type | Use For |
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|------|---------|
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| **B-tree** | General purpose, equality & range |
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| **Hash** | Equality only, faster |
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| **GIN** | JSONB, arrays, full-text |
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| **GiST** | Geometric, range types |
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| **HNSW/IVFFlat** | Vector similarity (pgvector) |
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## Composite Index Principles
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```
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Order matters for composite indexes:
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├── Equality columns first
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├── Range columns last
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├── Most selective first
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└── Match query pattern
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```
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