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

这是我今天学到的一个，因为我需要搜索一笔交易。

:: fn_dblog 这允许您查询数据库的事务日志。

USE mydatabase;
SELECT *
FROM ::fn_dblog(NULL, NULL)

http://killspid.blogspot.com/2006/07/using-fndblog.html

2008-10-16 02:02:57

其他回答

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

基于强硬的数据库开发人员对它的强烈反应，CLR集成应该排在前面。=）

2009-01-07 19:08:36

HashBytes()返回其输入的MD2、MD4、MD5、SHA或SHA1哈希值。

2008-09-23 14:21:35

sp_executesql

用于执行字符串中的语句。与Execute一样好，但可以返回参数

2008-10-24 16:21:10

Persisted-computed-columns

计算列可以帮助您将运行时计算成本转移到数据修改阶段。计算列与行其余部分一起存储，当计算列上的表达式与查询匹配时，将透明地使用它。您还可以在PCC上构建索引，以加快表达式的过滤和范围扫描。

Link

2008-09-29 17:00:54

SQL Server的隐藏特性

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