pl sql performance tuning techniques

server| Performance 1, in the program, to ensure that in the implementation of the function of the foundation, minimizing the number of accesses to the database, minimizing the number of accesses to the table by searching the parameters, minimising the result set, and reducing the burden of the network; the ability to separate the operations as much as possible, to improve the response rate each time; When you use

When the system is finished, performance problems are often an important issue in warranty and later maintenance. These days, the customer has to reflect that there is a very slow query. This query uses a primary key query, because the primary key is a clustered index and is fragmented. should be very fast. But the phenomenon of seeing is very slow (10 seconds or so, the worst is more than 18 seconds). Eliminates the problem of hardware, resource loc

Original address: Http://www.codeproject.com/Tips/1023621/SQL-Performance-Improvement-Techniques This article provides various options to improve the performance in database. 1) Re-write Query:If Any, the is taking much time-to-execute then the first step was to rewrite the query. Perform thorough analysis and move tow

requires a sort operation, while the others need to perform at least two sorting. Typically, SQL statements with union, minus, and intersect can be overridden in other ways. If your database is well-sort_area_size, using union, minus, intersect can also be considered, but they are very readable.(34) Optimize GROUP by: Increase the efficiency of the group BY statement by filtering out unwanted records before group by. The following two queries return

This article is based on MySQL. Many content applies to other relational databases at the same time and requires some indexing knowledge. It focuses on how to optimize SQL to improve database performance. This article is based on MySQL. Many content applies to other relational databases at the same time and requires some indexing knowledge. It focuses on how to optimize

As a code generator and ORM tool, linq to SQL automatically performs many tasks for us, which can easily cause us to doubt its performance. However, there are also several tests that show that the performance of linq to SQL can be improved to 93% of the performance of ado.ne

possible join The advantage of MySQL is simplicity, but in some ways it is a disadvantage. The MySQL optimizer is highly efficient, but because of its limited statistics, the optimizer's work process is more likely to deviate. For complex multiple table joins, on the one hand because of its optimizer limited, and also in the Join this aspect of the effort is not enough, so performance from Oracle and other relational database predecessors still have