As we all know, database applications are an extremely critical core component of IT systems, and SQL is the only interactive language for databases. SQL statements are not difficult to implement, but SQL statement optimization is more complicated. Someone needs to lead the way. Let’s see how to grasp SQL. Essential optimization?
SQL optimization is not simple. Doing a good job of SQL optimization requires knowledge of database architecture, table and index design, efficient SQL methods, advanced SQL syntax, multiple optimization tools, and even analysis of business characteristics and understanding of the shortcomings of the optimizer. Only by establishing the SQL optimization methodology system, can we quickly find the most suitable method to optimize SQL and solve the performance problems of SQL51.
In any IT system, data is the core, and it is also a hot spot for access and display. IT projects that are separated from the database hardly exist. It can even be said that there are almost no programmers who do not need to operate the database, but can interact seamlessly with the database. There is only SQL. In addition, SQL is a "dumb language" that is very easy to learn. Any where condition is a requirement to achieve. Basically, novice level developers can sit down and look at the simple syntax to write SQL. If you have 3 days to do it By learning, basically all SQL will be written. Let’s use my own example. Someone suddenly asked me how long I have been studying SQL development. I almost instinctively came out a sentence: SQL development, did I take the time to learn it? Isn’t it natural to write SQL? ?
Because SQL is so important, the cost of learning is so low, and it is natural to interact with the indispensable database in IT systems, so almost all Java, C++ and other developers can be more proficient in applying database SQL development technology. This leads to an unusually large number of people applying SQL development. Simply put, it is the sum of all front-end and back-end program developers, IT operation and maintenance personnel, and database developers.
How to solve the troubles of SQL optimization? Start with this book to grasp the essence of SQL optimization
Overview
Take the lead in introducing the two chapters that I find most helpful
This is part of the advanced content rewrite, of course, still need to be rewritten to see the problems, and why, so that we can better the rewrite, did not talk much, take a look at this part of the senior rewritten:
Chapter 14 hands-on, advanced writing applications let SQL fly
Specific SQL tuning ideas:
Rewrite SQL tuning:
Specific SQL tuning ideas:
Advanced SQL case introduction:
Chapter 15 hands-on, analytical functions let SQL fly
The Oracle analysis function implements some statistical functions that we need to code to achieve, which is of great help to simplify our development work, especially in the development of BI reports, which has unexpected effects; at the same time, we can also use analysis functions to achieve Some special needs.
Advanced SQL analysis functions:
The above is part of the advanced rewriting of this PDF. In fact, there are still many people in the company who can only find the problem, but it is difficult to find a solution to the problem, so let's start from the beginning:
Grasp the essence of SQL optimization
Chapter 1 The overall situation is in the chest-the overall optimization of SQL with tools
Chapter 2 Fast Speed-Effectively shorten the SQL optimization process
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Chapter 3 Following the Rules-How to Read the SQL Execution Plan
Chapter 4 Strategies-Coupes to Left and Right SQL Execution Plan
Chapter 5 Wait a minute, feel the architecture makes SQL fly
Chapter 6 Wait a minute, experience the logical structure to make SQL fly
Chapter 7 Wait a minute, the design of the search table makes SQL fly
Chapter 8 Wait a minute, learn how indexes make SQL fly
Chapter 9 Wait a minute, clarify the obstacles of indexes and let SQL fly
Chapter 10 Wait a minute, other index applications let SQL fly
Chapter 11 Wait a minute, the secret of table join makes SQL fly
Chapter 12 hands-on, classic equivalent rewrite to let SQL fly
Chapter 13 hands-on, procedural function optimization makes SQL fly
Chapter 14 hands-on, advanced writing applications let SQL fly
Chapter 15 hands-on, analytical functions let SQL fly
Chapter 16 Hands-on, grasp the needs and rewrite to let SQL fly
Chapter 17 Summary and Extension: From Don't Believe the Mistakes to Watch the Fire
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