good starting point is to display a graphical execution plan (http://msdn.microsoft.com/en-us/library/ms178071.aspx). Other useful resources include the grant Fritchey book,SQL Server execution plan (free ebook form), and The various operator query plan outputs in the Simple-talk article of the pellet-in Amorim series ( http://www.simple-talk.com/author/fabiano
50 tips for optimizing query: (see which one is suitable for you)
1. Place data, logs, and indexes on different I/O devices to increase the reading speed. In the past, tempdb can be placed on raid0, which is not supported by SQL2000. The larger the data size (size), the more important it is to increase I/O.
2. vertically and horizontally split the table to reduce the table size (sp_spaceuse)
3. upgrade hardware
4. Create an index based on the
Label:The join table operator operates on two input tables. There are three basic types of joins: Cross joins, Inner joins, and outer joins. The difference between the three types of joins is that they take different logical query processing steps, each of which has a set of steps. The cross join has only one step----cartesian product, the inner join has two steps----Cartesian product, filtering, and the outer join has three steps----Cartesian product
Label:It is understood that the vast majority of developers understand the index is smattering, limited to the majority of daily work without opportunities, and what is not necessary to care about the index, it is a query is too slow to find the query criteria to build an index OK, which day and a query slow, and then build an index is, Or simply the entire
Original: SQL Server performance Optimization nolock, greatly improve database query performanceThe company database grows with time, the data is more and more, the query speed is also more and more slow. Into the database to see a bit, hundreds of thousands of of the data, the que
Two tables linked to different libraries in the same server
This approach is limited to databases on the same server.I. Establishment of two databases, library a (table a) and Library B (table B).Second, to two libraries to assign the same account permissions.Use the following statement when querying:
The code is as follows
Copy Code
SELECT * from A.DBO.A, b.dbo.b where a.dbo.a.id=b.dbo.b.id
The result of this
Label:Original: SQL Server Tuning Series advanced (how the query optimizer runs)ObjectiveIn the previous articles, we introduced a series of basic descriptions of operators and the optimization methods and techniques for each operator. This includes a series of our common operators, including how to view execution plans, how several datasets are commonly used, ho
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
How do I retrieve the result set of a stored procedure (store Procedure) in a SQL Server query statement (Select)? (2006-12-14 09:25:36)Other descriptions of the same nature as this issue include:How do I get an execution result recordset for another stored procedure in a SQL Serv
successful, D-recovey for MS SQL Server can sometimes read out the data in the MDF data file. Let's describe some of the data recovery features of D-recovey for MS SQL Server.Let's take a look at some of the database corruption scenarios:1, due to power outages and other causes of database query, this is a more common
Solution Overview:
1. Change the file name during file storage
2. Configure the Indexing Server and associate the Indexing Server with the ms SQL Server.
3. Modify the SQL statement and add the content of the full-text query state
1. The problem system has a module that needs to query data in the Oracle database. Currently, this is achieved by creating a linked server. The current query statement of limit is a simple
1. The problem system has a module that needs to query data in the Oracle database. Currently, this is achieved by creating a link
Programme summary:
1. Change file name when storing
2. Configure the indexing server and associate the Index server with MS SQL Server.
3. Modify the SQL statement to include the contents of the Full-text query statement in the
XML query in SQL SERVER: FOR XML specifies PATHPreface
In SQL SERVER, you can specify RAW, AUTO, EXPLICIT, and PATH for XML queries. This article uses some examples to introduce the XML query of the specified PATH in
Directory
Background
Problem
Ideas
CTE
CTE recursive query
Conclusion
References
Background
I haven't written a blog for a long time. Recently I encountered a problem: "How can I traverse all the sub-Menus under a parent menu ?" Small and then use the CTE recursive query to solve this problem, sort the records for sharing.
Problem
How to traverse all sub-Menus under a parent menu?
Ideas
Fast_forward cursors on small datasets is often preferable to other progressive processing methods, especially if you must reference several tables to obtain the required data. Routines that include "totals" in the result set are typically faster than using cursors. If development time permits, a cursor-based approach and a set-based approach can all be tried to see which method works better.28. Set NOCOUNT on at the beginning of all stored procedures and triggers, set NOCOUNT OFF at the end. Y
Solution 5 use xml Parameters
If you are not familiar with SQL server xml type parameters, you must first understand the XQuery concept. Here, an XQuery is a language used to search for and extract elements and attributes from XML documents, simply put, the language used to query xml leads to XPath. In fact, XPath is a subset of XQuery. XQuery 1.0 and XPath 2.0 s
SSMs can provide the ability to view the plans that are being executed. Live query plan can view the execution of a query, from one query plan action to another query plan operation. Live query plan provides overall query run prog
This article gives an SQL statement to display the query between different databases on the same server, noting that the current connected user has permission to two libraries
The complete expression of an object in SQL Server SQL
Often listen to the students of Oracle materialized view, one of the functions of materialized view is that you can implement query rewriting, it sounds like a tall feeling, SQL Server also has the function similar to Oracle materialized view, just called indexed view. To tell the truth, or materialized views sound more appropriate, compared to the normal view, m
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