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Welcome to the 4th month of Performance tuning training . This month is all about statistics in SQL Server and how they can help the query optimizer generate a good enough execution plan. The statistics are primarily used by the query optimizer to

Use GeoIP2 to analyze visitors' IP addresses to obtain geographical location information. Link: http://blog.csdn.net/johnnycode/article/details/42028841 MaxMind GeoIP2 is widely used to identify locations and other features of Internet users, this

Original link: http://blog.csdn.net/johnnycode/article/details/42028841MaxMind GeoIP2 Services can identify the location and other characteristics of Internet users, including personalized content, fraud detection, advertising targeting, website

Original: SQL Drip 27-execution plan for performance analysisAlways want to find some of the authoritative reference for SQL statement performance debugging, but there is no reference may not be able to do the debugging work. I am convinced that the

Data retrieval, processing and storage 1. Write to a CSV file using NumPy and PandasTo write to the CSV file, NumPy's Savetxt () function is a function that corresponds to Loadtxt (), and he can save the array in a partition file format such as

Layer in Internet protocol stack People have already discussed how to map TCP/IP reference models to OSI models. Because TCP/IP and OSI model groups cannot exactly match, there is no correct answer yet. In addition, the lower layer of the OSI model