sql server columnstore index

In the application system, especially in the online thing processing system, the data query and processing speed have become the standard to measure the application system.The use of index to speed up the data processing speed has become the majority of database users to accept the optimization method.On the basis of good database design, the ability to index efficiently is the foundation of

Original: SQL Server index and Table Architecture (ii)Nonclustered indexesOverviewfor nonclustered indexes, the information involved is a bit more than the clustered index, because the entire length of the page is much more involved in the next "index of the included column

the database, and it takes longer to add, delete, and change data commands. Storage mechanism of indexes The catalog in the book is a word and a list of page numbers in which the index in the database is the value in the table and the list where the values are stored. A clustered index is a new physical space in the database that holds the values he arranges, and when new data is inserted, he rearranges th

through David Durante , 2017/10/18(first published: 2014/11/26) the seriesThis article is part of the stair series: Ladder index for SQL ServerThe basis of the index database design tells the developer to use the intent of the Database Designer. Unfortunately, the index is often followed by a performance problem that

BKJIA exclusive Article] low carbon index: here we use Intel Xeon X7500 processor TDP as the standard for computing power consumption TDP = 130 W/h = 2.167 W/m = 0.036 W/s) to facilitate computing and visualization ). In addition, according to data from the China Forestry Administration, a tree absorbs 5.023 kg of carbon dioxide a day and generates 0.785 kg of carbon dioxide per power. If the execution time of the database is reduced from 27 seconds t

Tags: Group impact dex STS HTML tail file without MicrosoftReference Original: http://www.cnblogs.com/tjy9999/p/4494662.html 1. Nonclustered indexes SET STATISTICSIo on SET STATISTICSTime on --1. No index (logical reads 568) SELECTFirstName, LastName fromDbo. ContactWHERELastName like 's%' --To create a nonclustered index IF EXISTS(SELECT * fromSys.indexesWHERE object_id = object_id('Person.Contact'

output results Value Description Scan count Number of scans saved med Logical reads Number of pages read from the data cache Physical reads Number of pages read from disk Read-ahead reads Number of pages placed into the cache for the query Using Physical reads and read-ahead reads values, You can estimate the I/O volume involved in a specific query. PhysicalBoth reads and read-ahead reads indicate the number of pages read from t

Tags: width image black rebuild requires Har index Primary CenterThe leaf page of a clustered index stores the table's data. As a result, table rows are physically sorted by clustered index columns, because table data can only have one physical order, so a table can have only a single clustered index. When we create a

Original: SQL Server 2008 Spatial Data Application Series II: the Spatial Index FoundationIn the previous blog post, we learned some basic knowledge about geographic information, and also learned about the spatial reference system, including the Earth ellipsoid, Datum, Prime Meridian, measurement unit, projection and other related theoretical knowledge, We can us

The leaf page of a clustered index stores the table's data. As a result, table rows are physically sorted by clustered index columns, because table data can only have one physical order, so a table can have only a single clustered index.When we create a PRIMARY key constraint, if there is no clustered index and the index