sql server index hint

Many people do not know how SQL statements are executed in SQL Server. They worry that SQL statements they write will be misunderstood by SQL Server. Many people do not know how SQL sta

Preface Indexes are one of the most important objects in relational databases. They can significantly reduce disk I/O and logical read consumption and improve the query performance of SELECT statements. However, it is a double-edged sword. Improper use affects performance: it requires additional space to store the index information and requires additional overhead to maintain index synchronization when data

In database principles, clustering indexes are interpreted as follows: the order of clustering indexes is the physical storage order of data, while the non-clustering indexes are interpreted as follows: the index order is irrelevant to the physical data arrangement order. Because of this, a table can have at most one clustered index. However, this definition is too abstract. In

1.1.1 SummaryIf we want to optimize the database, we can mainly use the following five methods to optimize the database system.1. Computer Hardware tuning2. Application Tuning3. Database Index Optimization4. SQL statement Optimization5. Transaction Handling TuningIn this blog post, we will want to tell you about the index type and usage in the database, this arti

Label:first, the basic concept of indexed views An 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 the indexed view) . The advantage is that it provides a very quick way to find the information behind the view. After the first

1.1.1 Summary If we want to optimize the database, we can optimize the database system using the following five methods. 1. Computer hardware optimization2. Application Optimization3. Database INDEX OPTIMIZATION4. SQL statement Optimization5. Transaction Processing Optimization In this blog post, we will want to talk about the index types and application scenar

Select OBJECT_ID (' dbo. Ft_cfp_trade_subaccount ')SELECT * from sys.partitions where [object_id]=1467256382SELECT * from Sys.allocation_units where container_id=72057594139049984SELECT * FROM sys.system_internals_allocation_units where container_id=72057594139049984SELECT * from Sys.dm_db_index_physical_stats (db_id (), object_id (' dbo. Mm_realquotehistory_11 '), Null,null, ' sampled ')SELECT * from Sys.dm_db_index_physical_stats (db_id (), object_id (' dbo. Mm_realquotehistory_11 '), Null,nul

SQL Server Performance Tuning 3 (Index) MaintenanceHeat1 reviews Brook Stream GrassSQL Server Performance Tuning 3 (Index) MaintenanceObjectiveThe previous article describes how to improve the query performance of a database by building an

An understanding of the index structureIn fact, you can interpret the index as a special kind of directory. Microsoft's SQL Server provides two indexes: a clustered index (clustered index, also known as a clustered, clustered

Original address:Stairway to SQL Server indexes:level 10,index Internal StructureThis article is part of the SQL Server cable Introduction order series (Stairway to SQL Server Indexes).

Tags: naming bin Sch clustered User Web page binding modeling altfirst, the basic concept of indexed views An 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

For example: Select * From Table1 where name = ''zhangsan'' and TID> 10000 And execution: Select * From Table1 where TID> 10000 and name = ''zhangsan'' Some people do not know whether the execution efficiency of the preceding two statements is the same, because the two statements are indeed different from the statement sequence. If TID is an aggregate index, then, the next sentence can only be searched from the 10000 records in the table; in the previ

index statement must appear with the table or view, and you need to declare the table where the column resides (on). The following explains the effect of an option　　1, Asc/descThese two options allow you to select ascending and descending order for the index. The default option is ASC, which is ascending.Why do I need two options for ascending and descending? Not the reverse order to view the

extension. The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensive utilization of these three types of paging files creates a new

What is an index The Table of Contents page (index) of the Chinese Dictionary: just as the Chinese characters are stored in a page, the data records in SQL Server are stored on the page, typically 4K per page. In order to speed up the speed of the search, the Chinese word (word) code generally have by pinyin, strokes,

Tags: blog http io os using AR java strong SPIndex of http://www.blogjava.net/allen-zhe/archive/2010/07/23/326966.html Performance optimizationRecent project needs, did a period of time SQL Server performance optimization, encountered some problems, but also accumulated some experience, now summed up, with June share. SQL Ser