sql server query tuning advisor

Tags: url inpu Good application response from is the parallel Operation database systemObjective In the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operator optimization techniques, the same emphasis on the master of basic knowledge. In this article, we can understand how

. server.2005. Technical Insider "series Conclusion This article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see

Label:Original: SQL Server database Performance tuning tipsThe reasons for the slow query are many, and the following are common: 1. No index or index is not used; 2, I/O throughput is small, forming a bottleneck effect; 3, insufficient memory; 4, the network speed is slow; 5, the amount of data queried is too large; 6

Speaking of the tuning of SQL Server, I think everyone would like to know this knowledge. I am also exploring the way, we have any good ideas, welcome to discuss and study. Win the people's long, can avoid weaknesses. This article is mainly from the programmer's SQL code, if you want to read, you can download the Inte

many other useful shortcut menus, such as mathematical and string functions. Continue to expand the object. You can use these menus to obtain the parameter requirements. For example, figure 35-15 shows the parameter data folder in the expanded mathematical function. 　Figure 35-15 view the parameter data folder in the object browsingUse SQL profiler　In addition to query analyzer, the

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

which some statements in SQL Server take advantage of the index may not be clear, our next analysis of this piece, to understand the indexing method and optimization techniques, interested in advance attention, about SQL Server performance tuning involves a wide range of co

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 many blocks.The principle of the BEGIN Tran is

easily believe that the online spread of those "SQL optimization gold sentence", "SQL Optimization prescriptions", their practice several times, is the hard truth. First figure out the goal of performance tuning From the most intuitive, most common point of view, mainly includes the following two points: Optimize response time What is "Optimizing response time"

I. OverviewThis time the introduction of instance-level resources waits for lck type locks, and an introduction to Lck locks can refer to "SQL Server lock and transaction dispel". The following is also the use of sys.dm_os_wait_stats to view and find the most time-consuming Lok lock.Select Wait_type,waiting_tasks_count,wait_time_ms, Max_wait_time_ms,signal_wait_time_ms from sys.dm_os_wait_stats where like

. 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