sql server performance tuning best practices

Because our application is running on the Liferay application server, some optimizations for the server are of course our first thought. We have done a lot of testing before, because Liferay will have css-fast-load, and js-fast-load, these parameters will be a number of CSS files or several JS files merged into a single large file, which can significantly reduce the number of network IO overhead, We develo

configuration.Linux is 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

configuration. Linux is 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

Label:In the mature leading enterprise database system, parallel query can be said to be a big weapon, in some scenarios he can significantly improve the corresponding time of the query, improve the user experience. such as SQL Server, Oracle, etc., MySQL is not yet implemented, PostgreSQL has implemented parallel scanning in 2015, believing they are also moving toward a more robust enterprise-class databas

union and UnionAll. UnionAll Good 18, pay attention to using distinct, do not use when not necessary, it will make the query slower than the union. Duplicate records are not a problem in the query. 19. Do not return rows or columns that are not required when querying 20. Use sp_configure ' query governor cost limit ' or setquery_governor_cost_limit to limit the resources consumed by the query. When an estimate query consumes more resources than the limit, the

used by dbreindex PointView Source images Conclusion Index fragmentation varies with different types of work. Some applications can greatly improve the performance from fragment. Understanding application features, system performance, and SQLThe fragment statistics provided by the server are the key to determining when to perform fragment. SQLServer provides c

nothing is perfect.The cost of the Begin Tran is that all the resources locked by the SQL statements cannot be released until the commit is committed before committing.It can be seen that if the BEGIN TRAN too many SQL statements, the performance of the database is poor. Before this large transaction commits, it is bound to block other statements, resulting in m

Label:Original: SQL Server Tuning Series advanced (how the query optimizer runs)ObjectiveIn the previous articles, we introduced a series of basic descriptions of operators and the optimization methods and techniques for each operator. This includes a series of our common operators, including how to view execution plans, how several datasets are commonly used, ho

. server.2005. Technical Insider "series Conclusion This 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 Server parallel operations, Then analysis of

SQL Server Integration Services (SQL Server integration services,ssis) has made a lot of progress on the foundation of its predecessor, the Data Transformation Services, the transformation service, from usability, Performance and parallelism, it has grown into an enterprise-

the statement is 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

SQL Server performance optimization skills, SQL Server Performance Optimization 1. Select the most efficient table name sequence (only valid in the rule-based Optimizer) The SQL

SQL Server address search performance optimization and SQL server performance optimization This is an example of a long time ago. Now, I have no intention of discovering the materials, so I will take it out and try again. 1. Requi

Linux server performance is often affected by CPU, memory, disk I/O, network bandwidth, and so on, for each Linux background server developer, it is necessary to master some of the common performance tuning tools. Covering almost every aspect of a system, the tools in the di

index, the TPS from the previous 110 to 6000 such. Two. The SQL statement index does not work: When performing a performance test, the server is running under the circumstances: The CPU of the database is up to 90%-99.9%, and the CPU of the application is low; Sufficient memory (free memory >20m); Network normal; Disk input/output is normal

ObjectiveIn the previous few we analyzed a series of SQL Server-related performance tuning, which I divided into two modules.The first module focuses on the basic content of the master, a total of 6 articles to complete, covering a series of basic algorithms, the detailed analysis of how to view the execution plan, mas

Some time ago, I had a performance problem with my website, and sometimes the page was very slow to open. It would take more than 10 seconds. I tried a lot of methods, including cache, disable viewstate, and Disable debug mode. The improvements were not obvious. Later, I ran into SQL Server Profiler to check the cause: a slow query dragged down the entire page

alarm tcp:time wait bucket table overflow. However, you can increase concurrency and save ports.Net.ipv4.tcp_max_tw_buckets = 8000Increase the range of available ports, as the effect impliesNet.ipv4.ip_local_port_range = 1024 65000Last two parameters I forgot what it meant, but also add it:)Net.ipv4.tcp_keepalive_time = 1200Net.ipv4.tcp_max_syn_backlog = 81920At this point, your Nginx server can be happy to run up!Redis

With examples and resolution plans, this article shows some tips for improving query efficiency on Microsoft SQL Server. There are many small tips and tricks in programming. Knowing these techniques can extend your ability to optimize your performance. All of our examples in this section choose to use the Microsoft Showplan_all output because it is more compact

This article includes tips and best practices for Microsoft®sql server™ Reporting Service report design. This article provides some basic design issues and the functionality of some report services. About this document From using data controls, to what formats to use, to how to distribute reports, report makers face a variety of options. Microsoft®