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MySQL index optimization solution

Chapter1 Index introduction
1-1 what is index
1-2 Index data structure
1-3 Advantages and Disadvantages of Indexing
1-4 Index classification
Chapter2 MySQL index-Explain
2-1 Index test
2-2 explain
2-3 Explain ID introduction
2-4 Explain's select_type introduction
2-5 Explain type introduction -1
2-6 Explain type introduction -2
2-7 Explain type introduction -3
2-8 Explain's possible keys and key introduction
2-9 Explain's ref introduction
2-10 Introduction to Explain
2-11 Explainvalueextra introduction
Chapter3 MySQL index - index failure
3-1 Index invalidation -1
3-2 Index failure -2
3-3 Index failure -3
Chapter4 MySQL Index-Optimization
4-1 Sorting optimization
4-2 Optimization case
4-3 Joint table query optimization
4-4 Group query optimization
4-5 Slow query log

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