SQL Server

  Because the version of a maintained project cannot be affected, many developers have experienced it, especially as the table data volume increases, so the performance of some SQL statements is getting worse and worse. In this way, as the number

Why use transactions?When updating multiple tables, an execution fails. Transaction rollback is required to maintain data integrity. Display Set transactions Begin Try Begin Transaction Insert Into Shiwu (ASD) Values ( ' Aasdasda '

Objects such as tables in the SQL Server database are stored in the sysobjects data table, and temporary tables are saved in the tempdb database. 1. Determine whether a common table exists. You can use the object_id function to return the Object

I wrote a stored procedure the other day and used transactions in the stored procedure.CodeComment out to debug and find the error. Suddenly, a table is locked. It turns out that the code for creating the transaction has forgotten to comment out.

ArticleDirectory 1. Start the MSDTC Service. 2. Set the MSDTC component. 3. Check whether two machines can ping each other through hostname. 4. Start the distributed remote connection of SQL Server. I. symptom Assume that the

This article is from http://stackoverflow.com/users/6461/splattne. Thanks to his effort.   In order to optimize tempdb performance pay attention to physical disk configuration, file configuration, as well as some settings within the database.

It is a coincidence and helpless move to use this thing. Accidentally inserted some data after httputility. urlencodeunicode in the database. Some fields in the database are structured like % uxxxx. Search for the half-day T-SQL urldecode function,

Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Create   Function DBO. splitstring( @ Expression   Nvarchar ( 4000 ), -- String to be split @ Delimiter  

SQL server2005 failed: error40; unable to open the connection to SQL Server, set TCP/IP and other issues that cannot be connected. TCP/IP is set to allow. The username and password are correct. Sqlserver2005 built-in management tools can be

I. Data Definition Language)A document language is a language defined for the format and form of a document. It is the first thing that every database needs to create, the table relationships, column primary keys in the table, and the reference

(1) Char, varchar, text and nchar, nvarchar, ntextChar and varchar are both between 1 and 8000 characters in length. The difference is that char is a fixed-length character data while varchar is a variable-length character data. The so-called fixed

Preface This seriesArticleThere are four parts: 1.CLR overview. 2. Perform CLR integrated programming in Visual Studio and deploy it to SQL Server, including stored procedures, triggers, custom functions, custom types, and aggregation. 3.

SQL ServerHorizontal scaling: Design, implementation and maintenance (3)-distributedPartitionView implementation In the previous articleArticle, We have already mentionedDistributed partition ViewThe linked server technology is used for

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> -- Member table If Object_id ( ' Userinfo ' , ' U ' ) Is Not Null Drop Table Userinfo Go Create Table

From yesterday's online search for "Data Synchronization", the most frequently-used Article It is an entry to your understanding of this knowledge! Concept of ReplicationReplication is a technology that copies a set of data from one data source

SQL Server provides a special data type: image, which is a type that contains binary data. The following example shows how to put text or photos in the database. In this article Article To see how to store and read images in SQL Server. 1.

It mainly uses case statements to solve the problem of Row-to-column conversion. The row-to-column conversion problem is mainly divided into two types: 1) Simple row-to-column conversion: Example Table: Id Sid Course Result 1 2005001

Transaction attributes Transactions have ACID properties That is, atomic atomicity, consistent consistency, isolated isolation, durable permanent Atomicity That is, the transaction should be taken as a unit of work, and the transaction is

From: http://atkins.5d6d.com/viewthread.php? Tid = 6847 Analyze and solve the SQL Server deadlock problem Deadlock. In short, two or more trans simultaneously request an object being requested by the other party, causing both parties to wait for

1. 'essential' of a trigger ': A trigger is a special stored procedure. It cannot be explicitly called. Instead, it inserts records, changes records, or deletes records into a table. When an event occurs, automatically activated. 2. The 'function ':