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1. Problems faced by massive data systems 2. After the concurrency increases, the system pressure analysis 3. The bottleneck faced by the system after massive data + high concurrent access 4. Introduction to Redis, installation and deployment (windows, linux), PHP integration 5. The role of search engines in modern web systems and their installation and deployment (windows+linux) 6. Integration and use of Elasticsearch and php (thinkphp) 7. Mysql query optimization and performance analysis for tens of millions of data volumes in a single table 8. MySQL master-slave principle and its application in high-concurrency systems 9. Analysis of the differences and concerns between high-concurrency system code and ordinary system code architecture