SQL Server

Reference Address: http://topic.csdn.net/u/20090828/16/e693935a-99b7-4090-a6bc-0123c91183eb.html1. How to open the 1433 port of SQL Server 2005Configuration Tool->sql Server configuration Manager->mssqlserver ProtocolSee if the TCP/IP protocol

--get the most time-consuming first-n T-SQL statements --for SQL SERVER 2005 and later --assigning an initial value of N toDeclare @n int Set @n= - ; withMaco as ( Select Top(@n) plan_handle,sum(Total_worker_time) asTotal_worker_time,

There's nothing new under the sunI. SQL Server framework Structure1. Three stages of query optimizer1), find the plan cache if you find a direct use2), simple statement generation 0 overhead execution plan3), formal optimization in general, the

First, install MySQL 5.5 (can not be on the same server as SQL Server), and create a new empty database (typically UTF-8 encoded) to receive the imported data.Two, install Mysql-connector-odbc-5.3.2-win32 on the server of SQL Server.Third, run

a view is a table of data tables or tables with multiple data table maps, but a virtual tableThe role of the view Improve the security of data accessIn real-world applications, if you do not want the developer to be able to query all the

For SELECT statements:1, when the table scan, the page will be locked directly, instead of locking a specific record, so there will be these locks:A, database S lockB, the table is lockC, the page s lock2. When the index is used to find the data,

New methods introduced by SQL Server 2005.SELECT * FROM (select Row_number () Up (ORDER by Keyfield DESC) as RowNum, * from TableName) as T WHERE rowNum > start and RowNum whichKeyfield is a field of table TableName (preferably a primary

The person who writes the program often needs to analyze whether the SQL statement that has been written has been optimized, and how fast the server responds, this time it needs to use the statistics state value of SQL to view it.By setting

Recently, a small tool is required for the project.Requirement: the customer uses the old database and stores some data. After a while, we modified the new database based on the new features proposed by the customer. These modifications have many

1. Stored Procedure 1. Storage Process Classification A stored procedure is a database object that is stored in a database and can be executed by an application through a single call. Allows users to declare variables and perform conditional

When using tables in a database, we often encounter two ways to use tables: using temporary tables and table variables. In actual use, how can we flexibly use them in the stored procedure? Although they implement the same functions, in a stored

Currently, web-based attacks are generally injected. Generally, the cause of injection is that the variables are not completely filtered, so that intruders can illegally execute programs or query and modify arbitrary data. As injection attacks

After installing Ms SQL Server 2005, I am not used to it. Because I have been using SQL server 2000 before, I found that SQL server 2005 has been changed in many places, and sometimes a small function is required for a long time. Today, because I

A stored procedure is one or more SQL commands stored as executable objects in the database.Definition is always abstract. The stored procedure is actually a set of SQL statements that can complete certain operations, but these statements are stored

Long-term modification or deletion of a table will produce a large number of fragments, affecting the database performance. The solution is to reconstruct the table or index, eliminate fragments, and achieve optimization. Directly run the Code: /*

1. Related Data TablesScore Table [User] TableThe SQL statement is as follows:Copy codeThe Code is as follows:-- Query the student information with the best scores in each subject-- Self-connection-- Select top 1 * FROM Score B where B. ScoreName = '

Annotate the stored procedure in SQL Server and create it in mysql. #! /Usr/bin/perl Use DBI; Use Switch; Use Encode; Use Encode: CN; My $ source_name = "sqldb "; My $ source_user_name = "sa "; 'My $ source_user_psd = "123 "; My $ db_name = "mysqldb

1. Primary Key and clustered Index First, clarify the concept that the primary key is not equal to the clustered index. (Isn't that nonsense? If it's the same thing, Microsoft won't call two different names) A table can have only one clustered index,

Recently, I found that the database is too large and has insufficient space. Therefore, I plan to clear all the data in the database, but there are a lot of tables, one by one, which is really troublesome, therefore, we want to use SQL statements to

What is bitmap index? What are the features of Bitmap indexes? What are the advantages and disadvantages of Bitmap indexes? Let's look at the example of Bitmap scanning. Query plan items ------------------- Bitmap Heap Scan on bitmap_test (cost =