SQL Server

Microsoft's SQL Server provides two types of indexes: Clustered indexes (clustered index, also called clustered indexes, clustered indexes), and nonclustered indexes (nonclustered index, also called nonclustered indexes, non-clustered indexes) ...(a)

Transferred from: http://www.maomao365.com/?p=6965Summary:Here are two ways to share a null value in a field with a specified value, as follows:Lab environment: SQL Server R2 Cases:Create TableTest (keyIdint Identity, infovarchar( -))GoInsert

Days to build AlwaysOn, encounter a bunch of problems, to solve it took a lot of time, hereby write down a few representative, so as to avoid the subsequent encounter to do repetitive work.First, create an availability groupUsing the SSMs Create

Judging the total number of records in a table is the most common thing for a developer. I think the common practice is: Select Count(*)FromTable Name; This is not done. I am mainly talking about efficiency issues here. When the number of

Query whether a table exists:In practice, you may need to delete a table. before deleting a table, you are advised to check whether the table exists to prevent returning error messages. In SQL Server, you can use the following statement: If

SQL Server compact and LINQ to SQL? By default, SQL Server compact 3.5 is installed in all Visual Studio versions. Therefore, it can be used with LINQ to SQL on the development computer. However, applications using SQL Server compact 3.5 and LINQ

1. To confirm that no other person is connected to the current database, use sp_who to view the connection, and then use kill @ spid to forcibly close the connection. 2. Run the SQL statement to modify the database's collate attribute.   Code

Ms SQL Server provides many database repair commands that can be attempted when the database challenges or some cannot complete the read. 1. DBCC checkdbAfter the server is restarted, if no operation is performed, execute the following SQL statement

SqlserverIn 2005, many new features are added. For developers, the most important thing to mention is XML support and CLR integration. Of course, there are some new features about "High Availability" (Database Cluster/database image/log transmission)

 1. Concurrency consistency Common concurrency consistency problems include: Lost modifications, non-repeated reads, dirty reads, and Phantom reads (Phantom reads are often classified as non-repeated reads in some materials ).1.1 lost

This section describes SQL statements, sqltransaction, and transactionscope. All examples in this section run in SQL Server 2008 and vs 2008 environments. If SQL Server 2005 is not available, the same applies to SQL Server, however, SQL se rver 2000

Does SQL server allow simple copy to back up database data and log files? The answer is yes. However, the premise is that data files are no longer used by SQL Server. When the database is active, you cannot simply copy its files. We recommend that

Continued: SQL Server programming series (2): operations on common SMO objects I recently used programming implementation for SQL Server Management Tasks in my project. I have some experiences and want to share with you here, I have used SMO, SQL

Optimization SQL Server DatabaseThere are many reasons for slow query speed, which are common in the following ways: 1. No index or no index is used (this is the most common problem of slow query and is a defect in programming) 2. Low I/O throughput,

From: http://blogs.msdn.com/ B /apgcdsd/archive/2011/02/11/sql-server-tempdb.aspx TempdbThe system database is a global resource for all users connected to the SQL server instance. In the current SQL Server, the frequency of use may exceed the user'

In the previous experiment, I tried to use the connection server and ad hoc query to import the data in Excel to the database in SQL server2005. But as the saying goes, the plan cannot keep up with the change. No, the change is coming. In further

To deploy an application that uses SQL Server compact 3.5 or a smart device that runs the program for testing, the target device or simulation program must have SQL Server compact 3.5 installed. Some devices are installed with SQL Server compact 3.5

Uninstall SQL Server first, and then delete the "Microsoft SQL Server" folder generated during installation. Register Delete all HKEY_CURRENT_USER/software/Microsoft SQL Server and HKEY_LOCAL_MACHINE/software/Microsoft SQL Server (Delete the

  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

The options ansi_warning and ansi_nulls must be enabled, as if they do not affect the system.   The landlord checks two places again. After testing, this must be set when you want to use distributed transactions. 1. Link server and name resolution