SQL Server的隐藏特性

SQL Server有哪些隐藏特性?

例如，没有文档的系统存储过程，做一些非常有用但没有足够文档的事情的技巧?

答案

感谢大家的精彩回答!

存储过程

sp_msforeachtable: Runs a command with '?' replaced with each table name (v6.5 and up) sp_msforeachdb: Runs a command with '?' replaced with each database name (v7 and up) sp_who2: just like sp_who, but with a lot more info for troubleshooting blocks (v7 and up) sp_helptext: If you want the code of a stored procedure, view & UDF sp_tables: return a list of all tables and views of database in scope. sp_stored_procedures: return a list of all stored procedures xp_sscanf: Reads data from the string into the argument locations specified by each format argument. xp_fixeddrives:: Find the fixed drive with largest free space sp_help: If you want to know the table structure, indexes and constraints of a table. Also views and UDFs. Shortcut is Alt+F1

片段

Returning rows in random order All database User Objects by Last Modified Date Return Date Only Find records which date falls somewhere inside the current week. Find records which date occurred last week. Returns the date for the beginning of the current week. Returns the date for the beginning of last week. See the text of a procedure that has been deployed to a server Drop all connections to the database Table Checksum Row Checksum Drop all the procedures in a database Re-map the login Ids correctly after restore Call Stored Procedures from an INSERT statement Find Procedures By Keyword Drop all the procedures in a database Query the transaction log for a database programmatically.

功能

哈希字节（） EncryptByKey 枢轴命令

Misc

Connection String extras TableDiff.exe Triggers for Logon Events (New in Service Pack 2) Boosting performance with persisted-computed-columns (pcc). DEFAULT_SCHEMA setting in sys.database_principles Forced Parameterization Vardecimal Storage Format Figuring out the most popular queries in seconds Scalable Shared Databases Table/Stored Procedure Filter feature in SQL Management Studio Trace flags Number after a GO repeats the batch Security using schemas Encryption using built in encryption functions, views and base tables with triggers

当前回答

SQL Server 2005:

select * from sys.dm_os_performance_counters

select * from sys.dm_exec_requests

2008-09-23 16:05:02

其他回答

我最喜欢master..xp_cmdshell。它允许您从服务器上的命令提示符运行命令并查看输出。如果你不能登录到服务器，但你需要获取信息或以某种方式控制它，它是非常有用的。

例如，列出运行SQL server的服务器C:驱动器上的文件夹。

主. .Xp_cmdshell ` dir c:\ `

您还可以启动和停止服务。

主. .xp_cmdshell的sc查询“My . 服务”的主. .xp_cmdshell 'sc stop“My . 服务”的主. .xp_cmdshell 'sc start“My . 服务”的

它很强大，但也有安全隐患。许多人禁用它，因为它很容易被用来在服务器上做坏事。但是，如果你能接触到它，它会非常有用。

2008-09-26 14:31:04

用于解析存储过程参数:xp_sscanf

将数据从字符串读入每个格式参数指定的参数位置。下面的示例使用xp_sscanf 从源中提取两个值属性中的位置源字符串的格式。

DECLARE @filename varchar (20), @message varchar (20)
EXEC xp_sscanf 'sync -b -fproducts10.tmp -rrandom', 'sync -b -f%s -r%s', 
  @filename OUTPUT, @message OUTPUT
SELECT @filename, @message

这是结果集。

-------------------- -------------------- 
products10.tmp        random

2008-09-23 14:47:43

连接字符串额外功能:

MultipleActiveResultSets = true;

这就产生了ADO。Net 2.0及以上版本在单个数据库连接上读取多个只向前、只读的结果集，如果要进行大量读取，这可以提高性能。即使是混合执行查询类型，也可以打开它。

应用程序名称= MyProgramName

现在，当您希望通过查询sysprocesses表来查看活动连接列表时，程序的名称将出现在program_name列中，而不是“”。Net SqlClient数据提供程序

2008-09-23 15:21:30

根据单个语句中管道分隔的id字符串返回结果(替代传递xml或首先将分隔的字符串转换为表)

例子:

DECLARE @nvcIDs nvarchar(max)
SET @nvcIDs = '|1|2|3|'

SELECT C.*
FROM tblCompany C
WHERE @nvcIDs LIKE '%|' + CAST(C.CompanyID as nvarchar) + '|%'

2009-05-21 18:17:19

使用osql实用程序运行命令行查询/脚本/批处理

2009-09-01 19:00:27

SQL Server的隐藏特性

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