SQLServer DBA常見問題
In the latest installment of the SQL Server interview questions, we will outline questions suitable for a DBA interview to assess the candidates skills related to SQL Server system databases. In this tip, the questions are there to read, but the answers are intentionally hidden to really test your skills. Once you read the question and have determined your answer, then highlight the answer to see how you did.
Solution
Question Difficulty = Easy
Question 1: What are the SQL Server system databases and can you outline the general functionality of each database?
Master - Database responsible for SQL Server instance related data. You can also think of this database corresponding to the Windows SQL Server service account.
Resource - Database responsible for SQL Server system objects. This database was introduced in SQL Server 2005 and is intended to ease the upgrade and rollback of SQL Server system objects.
Model - Template database for the creation of new user defined databases.
MSDB - Database responsible for SQL Server Agent related data such as Jobs, Alerts, Operators, etc.
TempDB - Temporary database to store temporary tables (#temptable or ##temptale), table variables, cursors, work tables, row versioning, create or rebuild indexes sorted in TempDB, etc. Each time the SQL Server instance is restarted all objects in this database are destroyed, so permanent objects cannot be created in this database.
Distribution - Database responsible for managing replicated data. This database could reside on the publisher or subscriber.
Additional information: SQL Server 2005 Books Online - System Databases
Question 2: True or False - Can you create objects in the Master, Model and MSDB databases?
True.
Question 3: Is it a good idea to create objects in the system databases?
In general , objects should not be created in the system databases. In general, it is a best practice to create a separate database for user defined objects that would be used instanc
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概述：
配置 Web 同步
url: http://technet.microsoft.com/zh-cn/library/ms151810(SQL.90).aspx
若要对复制使用 Web 同步，请执行下列步骤：
配置发布，以允许使用 Web 同步。
配置运行 Microsoft Internet 信息服务 (IIS) 的计算机以同步订阅。支持 IIS 5.0 和 6.0 版。
配置一个或多个订阅以使用 Web 同步。
......
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient; ......
一、主键与聚集索引并不是一对一匹配的
一般情况下我们都认为,聚集索引和主键是相互匹配的,因为只要你在SQLServer表中定义了一个主键,那么SQLServer会为这个主键自动添加聚集索引.但是,如果你先在表中基于任意一列建立聚集索引,然后再选择另一列作为主键,这时,这个SQLServer将会基于这个主键建立一个唯一非聚集索引.
二、 ......
1.绝对值
S:select abs(-1) value
O:select abs(-1) value from dual
2.取整(大)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.取整（小）
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.取整（截取）
S:select cast(-1.002 as int) value
O:selec ......
昨天下午快下班的时候，无意中听到公司两位同事在探讨批量向数据库插入数据的性能优化问题，顿时来了兴趣，把自己的想法向两位同事说了一下，于是有了本文。
公司技术背景：数据库访问类（xxx.DataBase.Dll）调用存储过程实现数据库的访问。
技术方案一：
压缩时间下程序员写出的第一个版本，仅仅为了完成任务，没有从程 ......
