sql query tuning tips

50 tips for optimizing query: (see which one is suitable for you) 1. Place data, logs, and indexes on different I/O devices to increase the reading speed. In the past, tempdb can be placed on raid0, which is not supported by SQL2000. The larger the data size (size), the more important it is to increase I/O. 2. vertically and horizontally split the table to reduce the table size (sp_spaceuse) 3. upgrade hard

Label:Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk

I will share 11 practical tips on Java performance tuning and java Tuning Most developers think that performance optimization is a complicated problem and requires a lot of experience and knowledge. Yes, it is not wrong. It is not easy to optimize the application to achieve the best performance, but it does not mean that you cannot do anything before getting the

Tags: sdn is ola visible reason water personal tuning tunToday, while watching Tri Hua's SQL optimization book, he saw a case in which he solved the SQL performance problem, and Tri Hua the teacher successfully positioned the problem and solved it. Here, on the basis of Tri Hua teacher analysis and positioning, do further analysis and reasoning, so that we can st

Server Tuning series advanced (How to index tuning)SQL Server Tuning series advanced (how to maintain database indexes)The third Topsy module focuses on specific issues followed by specific tips (Hints), based on the analysis of the first two modules.SQL Server

bytes received via sql*net from client2 sql*net roundtrips To/from Client0 Sorts (memory)0 Sorts (disk)1 rows processedSql> set Autotrace off2. Create an optimization task by dbms_sqltune the create_tuning_task of the package. And then through Dbms_sqltune. Execute_tuning_task to run tuning tasks and generate tuning r

to explicitly delete all temporary tables at the end of the stored procedure, TRUNCATE table first, and then drop table, which avoids longer locking of the system tables. 25. Avoid using cursors as much as possible, because cursors are inefficient and should be considered for overwriting if the cursor is manipulating more than 10,000 rows of data. 26. Before using a cursor-based method or temporal table method, you should first look for a set-based solution to solve the problem, and the set-bas

30 SQL query optimization tips for mysql with tens of millions of big data, mysqlsql 1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order. 2. try to avoid null value determination on the field in the where clause. Otherwise, the engine

%,%delete% statement. View MORE: How to create a trace (SQL Server Profiler) Http://technet.microsoft.com/zh-cn/library/ms175047.aspx Iv. SQL Server profiler-> Tools-Database Engine Tuning Advisor Workload Select the file that you just saved. Select one of the databases and tables you want to optimize (not all selected, will be stuck) The options are in Chine

Supports SQL tuning and SQL TUNING A friend of mine found me a few days ago and said that an SQL Performance problem exists to see if it can be optimized. The process is as follows: Snow Leopard 9:35:10 Are you there? Orchid island master 15:07:39 I forgot. What's the matter

fragmentation level: 2. Select the correct index 2.1 main considerations Query by range Data that often needs to be sorted 2.2 secondary considerations The column length must be short. Will affect all non-clustered Indexes Non-clustered indexes also contain the key values of all clustered indexes. Data Type 3. indexing principles Priority of all SQL syntaxes Give priority to creating indexes that c