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

Vardecimal存储格式

SQL Server 2005为数字和十进制数据类型添加了一种新的存储格式，称为vardecimal。Vardecimal是十进制类型的一种变长表示，可以在行的每个实例中保存未使用的字节。如果十进制定义很大(如decimal(38,6))，但存储的值很小(如0.0)，或者有大量重复值，或者数据填充稀疏，则可以节省最多的时间。

Link

2008-09-29 17:02:46

其他回答

找出最流行的查询

与系统。Dm_exec_query_stats，您可以通过一个查询计算出许多查询分析的组合。

链接用命令

select * from sys.dm_exec_query_stats 
order by execution_count desc

2008-09-29 17:03:14

在SQL Server 2005/2008中显示SELECT查询结果中的行号:

SELECT ( ROW_NUMBER() OVER (ORDER BY OrderId) ) AS RowNumber,
        GrandTotal, CustomerId, PurchaseDate
FROM Orders

ORDER BY是一个强制性条款。OVER()子句告诉SQL引擎对指定列(在本例中为OrderId)上的数据进行排序，并根据排序结果分配数字。

2009-02-10 15:22:30

在SQL Server Management Studio (SSMS)中，您可以在对象资源管理器中突出显示对象名称，并按Ctrl-C将该名称复制到剪贴板。

不需要按F2或右键，重命名对象复制名称。

您还可以将对象从对象资源管理器拖放到查询窗口中。

2009-12-18 19:36:19

/*找到空闲空间最大的固定驱动器，也可以复制文件来估计哪个磁盘最快*/

EXEC master..xp_fixeddrives

/*在使用或引用之前检查文件的假设*/

EXEC master..xp_fileexist 'C:\file_you_want_to_check'

详情请点击这里

2008-09-23 15:09:22

通过关键字查找过程

哪些过程包含特定的文本(表名、列名、变量名、TODO等)?

SELECT OBJECT_NAME(ID) FROM SysComments 
WHERE Text LIKE '%SearchString%' 
AND OBJECTPROPERTY(id, 'IsProcedure') = 1

2008-10-01 21:26:32

SQL Server的隐藏特性

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