Sql Server Central
SQL SERVER -2005
A database or DBMS allows users to access their data and helps them to convert data into information. These systems include database management dBase, Paradox, IMS, SQL Server and SQL Server. These systems allow users to create, update and extract information your database.
A database is a structured collection of data. Data refer to the characteristics of people, things and events. SQL Server stores each data element in your account. In SQL Server, the fields related to a particular person, thing or event are grouped to form a single complete unit of data called register (this can be described as raw or event). Each record consists of a number of areas. There are two fields of a record may have the same field name.
During a design project of SQL Server databases, analyze your business needs identifies all the fields or attributes of interest. If your company needs a change with time, can define additional fields or change the definition of existing fields.
SQL Server Tables
SQL Server stores documents related to the other in a table. Different tables are created for different groups of information. Related tables are grouped to form a database.
PRIMARY KEY
Each table in SQL Server has a field or a combination of fields that uniquely identifies each record in the table. The identifier one is called the primary key, or simply the key. The primary key provides the means to locate a record of all others in a table. Allows the user and the database system to identify, locate and refer to a particular record in the database.
Relational Database
Sometimes, all information relevant to a business can be stored in a table. SQL Server provides the data link multiple tables. Corresponding to an employee of department where the work is an example. This is what makes SQL Server a relational database management or RDBMS. It stores data in two or more tables and enables you to define relations between the table and lets you define relationships between tables.
FOREIGN KEY
When a field is a table's primary key is another field appears as a foreign key. A foreign key is a field or group of fields in a table whose values match the primary key in another table.
Referential Integrity
SQL Server not only allows you to link multiple tables, it also maintains consistency between they. Make sure that the data between the tables is the correct link shows how to maintain referential integrity.
Abstraction data
One of the main purposes of a database system is to provide users an abstract view of data. This system hides certain details of how data is stored and maintained. The abstraction of the data is divided into three levels.
Physical Layer: This is the lowest level of abstraction describes how data is actually stored.
Conceptual Level: At this level of abstraction database of all assigned and the data are actually stored is described and income, and relations between them.
Level View: This is the highest level of abstraction describes only part of the database.
ADVANTAGES The RDBMS
- The redundancy can be avoided
- The inconsistency can be eliminated
- Data can be shared
- The standards are applicable
- CA security restrictions that apply
- Integrity can be maintained
- Conflicting requirements can be balanced
- Independence data can be achieved.
Disadvantages of DBMS
A significant disadvantage is the cost DBMS. In addition to the costs of acquisition of software development, hardware must be updated to allow large programs and the necessary work area for execution and storage. While centralization reduces duplication, lack of duplication requires that the database is adequate support for that in case of failure data can be recovered.
SQL Server Management with the Central Management Server
|
SQL Server 2005 Maintenance Plans
$34.99 Maintenance plans are one of those evolutionary items that have changed substantially, but retain a familiarity to the same subsystem in SQL Server 7 and 2000. These are automated plans that are customizable and greatly ease the setup and administration of a SQL Server instance. For example, while the wizard has changed slightly, most DBAs will easily find their way through to change and setup the... |
|
Two Minute SQL Server Stumpers Vol 3
$7.60 100 great questions and answers about SQL Server from SQLServerCentral.com Book is organized in question/answer format, explains the correct answer Questions cover a wide range of SQL Server topics This is Volume 3 in the series... |
|
Two Minute SQL Server Stumpers - Vol. 1
$12.34 Got an interview tomorrow? Studying for an exam? Need something to pass the time while you restore that 20GB database? SQLServerCentral.com has put together just the resource for you. This book contains 100 questions and associated answers on various aspects of working with SQL Server: administration, security, development, DTS, and more! These are high quality questions from our very popular Ques... |