Indexing & Performance
Index Basics
Speeding Up Queries
💡 Index, EK, "KITAAB, KA, INDEX, PAGE" jaisa, hai — BINA, INDEX, ke, MySQL, ko, POORI, TABLE, (FULL, TABLE, SCAN) PADHNI, PADТI, hai — INDEX, ke, saath, DIRECTLY, RELEVANT, rows, tak, PAHUNCHA, ja, sakta hai.
Index, EK, SPECIAL, DATA, STRUCTURE, (B-tree) hai, JO, EK, COLUMN, ke, values, ko, EFFICIENTLY, SEARCHABLE, ORDER, mein, STORE, karta hai — CREATE INDEX, se, EK, NAYA, INDEX, banaya, jaata hai.
PRIMARY KEY, PAR, MySQL, AUTOMATICALLY, EK, INDEX, banaता hai. FOREIGN, KEYS, PAR, bhi, aksar, index, banaна, CHAHIYE — join, performance, ke, liye.
CREATE INDEX idx_email ON users(email);
-- Ab, ye, query, FAST, hai:
SELECT * FROM users WHERE email = 'aarav@example.com';
-- Indexes, list, karna:
SHOW INDEX FROM users;📇
Index, EK, "KITAAB, KA, INDEX, PAGE" jaisa, hai — BINA, INDEX, ke, MySQL, ko, POORI, TABLE, (FULL, TABLE, SCAN) PADHNI, PADТI, hai — INDEX, ke, saath, DIRECTLY, RELEVANT, rows, tak, PAHUNCHA, ja, sakta hai.
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⚡ Quick Recap
- Index = B-tree structure, jo, column, values, ko, efficiently, searchable, banata, hai
- Primary key, PAR, MySQL, automatically, index, banaта, hai
- Indexes, write, operations, ko, slower, banaте, hain — trade-off, samajhna, ZAROORI, hai
On this page (2 subtopics)
UNIQUE, index, DUPLICATE, values, ko, PREVENT, karta hai, SAATH, hi, LOOKUP, performance, bhi, improve, karta hai — UNIQUE, constraint, aur, unique, index, EK, HI, CHEEZ, ke, DO, NAAM, HAIN.
CREATE UNIQUE INDEX idx_email_unique ON users(email);SHOW INDEX, se, HAR, index, dekha, ja, sakta hai — performance_schema, se, index, usage, statistics, bhi, mil, sakti, HAIN. Unused, indexes, DROP, karne, se, write, performance, improve, hoti, hai.
Common Mistake: Har, unnecessary, index, HAR, write, operation, (INSERT/UPDATE/DELETE) ko, THODA, SLOWER, banaता, hai — sirf, WOHI, indexes, rakho, JO, ACTUALLY, use, ho, rahe, HAIN.