Schemas in VS .NET

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Schemas
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A schema is a collection of database entities within a single namespace With the use of schemas, different groups of database objects (tables, views, stored procedures, etc) can be grouped together into a common namespace For example, consider the AdventureWorks business They have a Sales department, and the database has tables and other objects directly related to sales We can create a Sales schema with the express purpose of organizing the sales objects within this namespace The concept of schemas in this context is new to SQL Server 2005, and largely it is resolving a problem that database administrators faced in previous editions of SQL server In a four-part name of a database object, the schema is the third part: serverNamedatabaseNameschemaNameobjectName In SQL Server 2000, the four-part name looked like this: serverNamedatabaseNameownerobjectName
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The Problem
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Every database object needs an owner Let s say I create a table named Employees in the Certification database on the MCTIP server The four-part name would look like this: MCITPCertificationdarrilgibsonEmployees This might work fine for a long time Perhaps I ve even created dozens of objects with myself as the owner Then a wonderful thing happens I win the lottery! Needless to say, I am no longer managing this database You come in and take over responsibility of the database However, all these database objects have my name on them You couldn t delete my database user because I own all of the objects If you were to change the owner name of any of these objects, relationships between them and other objects would be broken You would have to change the database owner name on all of the objects and on all of the definitions of the objects At the very least, you could expect a long weekend of changing and testing
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8: Database Security
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To avoid the problem, Microsoft s recommendation was for all database objects to be owned by the dbo user With all objects owned by the dbo, the problem could be avoided However, this also limited organization capabilities within the database
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With the creation of schemas in SQL Server 2005, users don t own objects Instead, we define a schema as a namespace that encompasses a group of database objects One or more users then own a schema Dropping a user isn t a problem because the user doesn t own the object If necessary, we grant ownership of the schema to another user The use of schemas also allows permissions to be managed with a higher degree of granularity EXAM TIP Users don t own objects Users own schemas and schemas are used to name objects With this understanding, a four-part name would never include the name of a user The third part of the four-part name should only include the schema name
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Database securables are objects that we can secure with permissions We grant specific permissions to principals on an object granting or denying access Many of the securables are listed in Table 8-3
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Columns Database Functions
Server Synonyms Table 8-3 Securables
Service broker queues Tables
Stored procedures Views
Permissions
The actual permissions that can be assigned to all the objects are too lengthy to include here If you want to view a complete list, take a look at the Permissions topic in Books Online However, we need to cover some generic concepts related to permissions Individual permissions can be granted, denied, or revoked:
Granted You are explicitly given this permission Denied You are explicitly denied this permission Revoked This removes any permissions that have been granted or denied
Grant and Deny are straightforward, but the Revoke permission frequently trips people up Revoke has a negative connotation and implies something is being taken away However, revoke doesn t always mean that access is no longer granted
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