Shulou(Shulou.com)05/31 Report--

In this issue, Xiaobian will bring you the optimization principles of SQL database. The article is rich in content and analyzed and described from a professional perspective. After reading this article, I hope you can gain something.

SQL database optimization principles can be started from the following aspects:

Design aspects:

Try to rely on oracle optimizer and provide conditions for it; suitable index, double effect of index, column selectivity;

Coding:

Use indexes to avoid large tables FULL TABLE SCAN; use temporary tables reasonably; avoid writing overly complex sql, not necessarily one sql to solve problems; reduce transaction granularity without affecting business;

Oracle Database SQL statement optimization overall strategy. Guided by these optimization strategies, we can enrich optimization schemes continuously through experience summary, and then guide us to optimize database performance of application system. Here are a few proven optimizations:

● When creating tables. The primary key should be established as far as possible, and the PCTFREE and PCTUSED parameters of the data table should be adjusted as far as possible according to actual needs; large data tables should be deleted with truncate tabledelete.

Rational use of indexes, in OLTP applications a table index is not too many. Binary tree index should not be established for columns with large data duplication, bitmap index can be adopted; column order of composite index should be consistent with column order of query condition as much as possible; for tables with frequent data operation, index should be reconstructed regularly to reduce invalid index and fragmentation.

The above is what the optimization principles of SQL database shared by Xiaobian are. If there are similar doubts, please refer to the above analysis for understanding. If you want to know more about it, please pay attention to the industry information channel.

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