how to index a database
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1,111,111 TRP = 11,111 USD
1,111,111 TRP = 11,111 USD
1,111,111 TRP = 11,111 USD
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Purpose: Indexes improve query performance by allowing faster lookup (e.g., B-tree, hash indexes).
Choose Columns: Index frequently queried columns (e.g., primary keys, foreign keys, or fields in WHERE , JOIN , or ORDER BY clauses).
Types:
Single-column: Indexes one column.
Composite: Indexes multiple columns (order matters).
Unique: Ensures column uniqueness.
Clustered: Physically reorders data (e.g., primary key in SQL Server).
Syntax:
SQL:
CREATE INDEX idx_name ON table_name (column1, column2);
NoSQL: Varies by system (e.g., MongoDB: db.collection.createIndex({field: 1}) ).
Best Practices:
Avoid over-indexing (slows writes).
Monitor performance (use EXPLAIN in SQL).
Rebuild fragmented indexes periodically.
Trade-offs: Faster reads vs. slower writes (indexes must update on INSERT / UPDATE ).
Example (SQL):
CREATE INDEX idx_customer_email ON customers (email); — Speeds up email searches
Tools like MySQL Workbench or MongoDB Atlas provide GUI options. Always test indexes with real queries.