sql server index tuning wizard

Tags: itblog custom function ANSI get TCA ORDER by how many ISS goodFirst, the basic concept of indexed viewsAn indexed view is actually a view that "materialized" a set of unique values into a clustered index, which is materialized almost as a table, and its data is stored in one copy (it consumes hard disk space, but the query is fast, for example, you can set count (), sum () in an indexed view). The advantage is that it provides a very quick way t

BuniessDateTime1 between ' 2016-6-21 ' and ' 2016-6-28 'There may be 10,000 data, then BUNIESSDATETIME2,BUNIESSSTATUS1, BUNIESSSTATUS2 filteringFinally, there is only one qualifying piece of data.The difference is that: at the beginning of the filter conditions, determine how many page queries to determine the initial criteria to meet the data, and then further filteringIf the data range that satisfies the query condition is determined relatively accurately at the very beginning, the data that

beginning of the filter conditions, determine how many page queries to determine the initial criteria to meet the data, and then further filteringIf the data range that satisfies the query condition is determined relatively accurately at the very beginning, the data that satisfies the condition can be finally confirmed by a relatively small price.If the data range that satisfies the query condition is determined relatively vaguely at first, the cost of the process is relatively large, although

First, the basic concept of indexed viewsAn indexed view is actually a view that "materialized" a set of unique values into a clustered index, which is materialized almost as a table, and its data is stored in one copy (it consumes hard disk space, but the query is fast, for example, you can set count (), sum () in an indexed view). The advantage is that it provides a very quick way to find the information behind the view. After the first

Transferred from: http://www.cnblogs.com/MR_ke/archive/2010/08/25/1807856.htmlSQL 2005 Performance TuningSQL Server runs for a period of time, and as data accumulates, SQL runs less efficiently, and in order to use business system normal actions, IT departments often need to spend a high price on SQL tuning experts to

more than 95% of the total SP cost. If we fix this insert into # temptable statement, the cost of the entire SP will naturally come down. Therefore, we need to insert this sentence. But it's slow! In the case of default, SQL Server results only displays a few characters. The SQL statement in the second line is incomplete, so we need to modify the settings. In th

First, the basic concept of indexed viewsAn indexed view is actually a view that "materialized" a set of unique values into a clustered index, which is materialized almost as a table, and its data is stored in one copy (it consumes hard disk space, but the query is fast, for example, you can set count (), sum () in an indexed view). The advantage is that it provides a very quick way to find the information behind the view. After the first

SERVER will be full load. The CPU time of the statement is also divided into the compile and execute phases. The optimizer has to figure out how much CPU resources are used in each of these two phases, and then see if there is any possibility of optimization to reduce CPU usage.4) statement execution alone does not see a big problem, but concurrent execution is prone to blocking and deadlocks. This is also an important task of sentence

poorly run applications outweigh the investment in human, program, and technology using reliable load testing methods. Therefore, I would like to provide the following list of load tests for your application, which will be a magic bullet to prevent your SQL Server performance tuning problem. Checklist: Load test--sql

server| optimization In the actual work, especially in the production environment, the optimization of SQL statements is very important, and it also plays a significant role in improving the performance of the database. We are always complaining about the performance of the machine, always complaining about the trivial issues of concurrent access, but if we are not optimizing a single

Recently, the following project encountered an urgent problem, my old horse and young people to fight together. The problem is that many queries are incredibly slow when the pressure data is poured into the database. Said there must be some basic guidelines for performance issues. The order of performance problems tunning 1 Architecture design (software architecture and database design, poor design is almost fatal) 2 Code defects (90% of performance problems) 3 Add

Weekend finally moved out of the rental, installed broadband .... Only to find the days without the net ... What a kind of isolation it is ... Can't stand that kind of day anymore .... Well, since the netAnn's up, and I have to go on with this series.Indexes and locks, these two topics are very important to our development engineers ... Only by understanding these two topics can we write high-quality SQL statements, in the previous blog, I saidIndexes

Label:Original: SQL Server Tuning Series Basics (Union operator summary)ObjectiveIn the last two articles, we describe how to view the query plan, and some of the common optimization techniques for join operators, and we summarize how the federated operators are used and how to optimize them.Talk less and go straight to the subject of this article.Technical prepa

Tags: file http img Local image HTTPS student engine MSSThe recent project to do thousands of students to face recognition record (currently about 630000 lines) query the last record, it is conceivable that the performance of this piece is a problem. As a shen, get to SQL Server Profiler and Database Engine Tuning Advisor These two jobs are QI.Start to install fo

"SQL Server 2005 Deadlock resolution Discovery" mentioned a while ago, serious deadlock, the average occurrence of a deadlock every day, in the resolution and processing of SQL server2005 deadlock in the search for a lot of information and think of a lot of ways, on why deadlocks and how less deadlock has a further understanding, Here to share with you:

This index cannot be designed from the design view of the data (or it may not be found!). ）[SQL]View PlainCopy CREATE INDEX ix_contractdetail_quantity On Contractdetail (Costid, substatus, Note) INCLUDE (Quantity); And the only difference between the normal index is the addition of an include labe

/1000 N ' Total time spent in MS ',total_worker_time/1000 N ' Total CPU time MS ',Total_physical_reads N ' Total number of physical reads ',Total_logical_reads/execution_count N ' Each logical read ',Total_logical_reads N ' Logical reads total number of times ',Total number of total_logical_writes N ' logical writes ',Execution_count N ' execution times ',Creation_time N ' statement compilation Time ',Last_execution_time N ' Last Execution time ',SUBSTRING (St.text, (QS.STATEMENT_START_OFFSET/2)

allselect ContactName from Customersorder by ContactNameWe use index scanning to avoid explicit sorting operations.We'll change the Union all to Union, and the operation will redo the two datasets.--Create a new query, it is necessary to add a display order by in order to appear merge connection to re-select ContactName from Newemployeesunion select ContactName from Customersorder by ContactNameHere we know that the Union operation will be the result

for a field in a table, a nonclustered index for that field can be an unexpected effect. Because the database system searches for data values, it searches for a nonclustered index, finds the location of the data value in the table, and then retrieves the data directly from that location. Because the index contains entries that describe the exact location of the

In many systems, such as the database that I am currently managing, indexes are often abused and even used to create indexes in batches using DTA (Database Engine Tuning Advisor) (DTA is now considered by the individual to be the true usefulness of discovering missing statistics, using DTA in previous projects, It prompted a lot of columns lack of statistical information, and then do not change other operations under the premise, the statistical infor