How to write and optimize SQL Server stored procedures
[Introduction] In the development process of database, we often encounter complex business logic and operations on the database. At this time, SP will be used to encapsulate the database operations. If there are many SPs in the project and there are no certain standards for writing, it will make it difficult to maintain the system in the future and make it difficult to understand the logic of the large SPs. In addition, during the development process of the database, complex problems will often be encountered. For business logic and database operations, SP will be used to encapsulate database operations at this time. If the project has many SPs and the writing is not standardized, it will make it difficult to maintain the system in the future and make it difficult to understand the logic of the large SPs. In addition, if the amount of data in the database is large or the project has high performance requirements for the SPs, you will encounter It is a problem of optimization, otherwise the speed may be very slow. Through personal experience, an optimized SP is even hundreds of times more efficient than a SP with poor performance.
Details:
1. If developers use Tables or Views from other libraries, they must create Views in the current library to implement cross-library operations. It is best not to use them directly. "databse.dbo.table_name", because sp_depends cannot display the cross-database table or view used by the SP, which is inconvenient for verification.
2. Before submitting SP, developers must have used set showplan on to analyze the query plan and conduct their own query optimization checks.
3. To improve program operation efficiency and optimize applications, you should pay attention to the following points during the SP writing process:(a) SQL usage specifications :
(b) Index usage specifications:
(c) Tempdb usage specifications:
(d) Reasonable algorithm use:
Based on the SQL optimization technology mentioned above and the SQL optimization content in the ASE Tuning manual, combined with practical applications, multiple algorithms are used for comparison to obtain the method that consumes the least resources and is the most efficient. Specific ASE tuning commands are available: set statistics io on, set statistics time on, set showplan on, etc.
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