sql server performance tuning videos

statements first, converting lowercase letters to uppercase and then executing (20) Use the connector "+" connection string sparingly in Java code! (21) Avoid using not on indexed columns usually (22) Avoid using calculations on indexed columns (23) Replace > with >= (24) Replace or with union (for indexed columns) (25) Replace or with in (26) Avoid using is null and is not NULL on an indexed column (27) Always use the first column of an index (28) Replace union with

The following articles mainly describe the ultimate SQL Performance tuning Technology of DB2, including the impact of pointers on the Performance of DB2 databases, DB2 performance tuning technology and a detailed description of mo

, converting lowercase letters to uppercase and then executing (20) Use the connector "+" connection string sparingly in Java code! (21) Avoid using not on indexed columns usually (22) Avoid using calculations on indexed columns (23) Replace > with >= (24) Replace or with union (for indexed columns) (25) Replace or with in (26) Avoid using is null and is not NULL on an indexed column (27) Always use the first column of an index (28) Replace union with Union-all (if possible)

, etc.Linux features are rich, powerful, and flexible. You can use it to complete various tasks. In this article, we will discuss some techniques to improve the performance of Linux servers.1. Adjust the Linux kernel elevator Algorithm for disk I/OAfter selecting a file system, some kernel and mount options may affect its performance. One of the kernel settings is the elevator algorithm. by adjusting the el

rich, powerful, and flexible, and you can do a variety of tasks with it, and in this article we'll discuss some tips for improving the performance of Linux servers.1. Tuning the Linux kernel elevator algorithm for disk I/OAfter selecting the file system, there are some kernel and mount options that may affect its performance, one of which is the elevator algorit

executed using the index ....First the nonclustered index contains the column: [Orderid],[customerid]The value we want to get is filtered according to Shippostalcode, so to get the result you have to do a single scan of the nonclustered index (index Scan), which can also, after all, nonclustered indexes are ordered, but in order to filter, you must introduce a bookmark lookup (Key Lookup) To filter, we know that the bookmark lookup is random io, the consumption is huge, so this filter is like i

storage, but the benefits are largely negligible. Conclusion This article first of all, this article mainly describes the T-SQL statement tuning from the execution plan of the following, and introduced a few common simple operators, the next one will focus on some of our most commonly used operators and tuning techniques, including: Join operators, aggregation

called the procedure cache.The execution plan cache primarily contains the query plan and execution context.2. Execute the query plan (Generate execution plan-Generate query results), as described in the next article.Compiling and recompilingSQL Server has an efficient algorithm to find an existing execution plan for any particular SQL statement. SQL

servers, the parameters of the last few lines can be a good way to reduce the number of time_wait sockets, but for Squid, the effect is not small. This parameter controls the maximum number of time_wait sockets, preventing squid servers from being dragged to death by a large number of time_wait sockets.Tuning is complete, then press to see the effect of it.# Netstat-n | awk '/^tcp/{++y[$NF]} END {for (w in y) Print W, Y[w]} ' established 968Issue 1: How to resolve the request after the e

children's shoes can be noticed in advance.The content of SQL Server performance tuning involves a wide range of topics, followed by an analysis in the following article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with

operation This is it, the next we add to SQL Server on the use of the index and dynamic index content, About indexes I believe that many people who understand database products are familiar with it, but the way in which some statements in SQL Server take advantage of the index may not be clear, our next analysis of th

Label:Original: T-SQL performance Tuning-information collectionIO information (starting from server startup)--database IO Analysiswith iofordatabase as (SELECT db_name (vfs.database_id) as DatabaseName, case if Smf.type = 1 Then ' log_file ' ELSE ' data_file ' END As Databasefile_type, sum (vfs.num_of_bytes_written) as

Refer to the book SQL. server.2005. Technical Insider "series ConclusionThis article first to this bar, the article is short, easy to understand, follow-up on the parallel operation of a part of the content, follow-up articles, this article mainly introduces the parallel operators in the query plan, next we will add some of the SQL

Web applications with more than 300 million data records in a single tableProgramAfter the test, some functional and performance problems were discovered. The following methods were taken to adjust the performance: Changing the vast majority of SQL queries to stored procedures can undoubtedly improve some performance