rebuild index sql server

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

We know that SQL Server data row storage has two kinds of data structure: A: Heap b:b tree (binary two fork tree) Data is sorted and stored in one of two ways, and friends who have studied data structures should know how to use binary trees, because it is convenient to use the binary search method to quickly Find the data. If it is a heap, then the data is not sorted in any order, there is no structure, t

SQL Server query performance optimization-index and SARG (I) For non-SARG statements, SQL SERVER must evaluate each record to determine whether it meets the WHERE clause conditions. Therefore, indexes are usually useless for queries using non-SARG conditions. A non-SARG stat

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

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

With the SQL Server event probe tool, you can use a captured trace to collect important information about the Server. With the Index Tuning Wizard, ITW, Index OPTIMIZATION Wizard, and correct general Index information, this trail

Brief introduction In SQL Server, data is stored on a page. When you add a clustered index to a table, SQL Server searches for the data by using the columns of the clustered index as the keyword. Therefore, the impact on performa

When we want a query to take advantage of an index, we typically add an index hint to the query, like this Copy Code code as follows: SELECT Id,name from TB with (index (Ix_xttrace_bal)) where bal In a production environment, the optimizer generally does not consider other indexes because of the reason for this

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

What does SQL Server non-clustered index bring to us? SQL Server Profiler is used to track the execution of SQL statements when a page is accessed. Because the application is very simple, three

Use full-text index in SQL Server Article Category: Generally, the full-text index in SQL Server is used for databases. After four steps: 1 ). install full text search Full Text Index S

Tags: Microsoft wildcard scalar SOF ZMQ system size Server sumFirst, how to open the execution plan? Open "Include Actual execution Plan" (shortcut key: ctrl+m) in Microsoft SQL Server Management Studio, execute SQL statement to see actual execution plan (graphic format, very intuitive), this is undoubtedly the most fr

server|word| Index Q: I need to import Microsoft Word documents into SQL Server and index the documents so that they can be used in relational queries. How do I import and index documents? A: