sql server index tuning wizard

Tags: replace identity varchar share log creation logical span BSP The source of this article: http://www.cnblogs.com/wy123/p/6617700.html SQL Server does not have a function index, in some scenarios when querying the field according to a certain part of the query or after some kind of calculation to do the query,If you use functions or other methods to function

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

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

I. Non-clustered index maintenanceThe row locator value for a nonclustered index keeps the same clustered index value, even after the clustered index column is physically relocated.To optimize this maintenance overhead, SQL Server

Copy Code code as follows: --begin Index (index) analysis optimization related SQL --Returns an index with more than 25% of the current database fragmentation rate --Running this statement scans a lot of data pages --Avoid running when the system load is relatively high --Avoid running when the system load is

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

It is understood that most developers have a smattering of understanding of the index, limited to most of the daily work no opportunity, what is not necessary to care about, understand the index, it is really a query too slow to find the query conditions to build an index on OK, which day again a query slow, and then establish an

, there is no one-cut means to solve all the problems.Summarize:In this paper, a simple example is given to analyze the effect of the order of columns on the query when creating a conforming index.Note that when creating an index, you should not only consider which columns to create indexes on, but also whether the order of indexed columns will affect the query.Avoid talking about indexing, which is the "Index