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The built-in schemas that are created when you install SQL Server are identified in 3
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HRAdmin HRAdmin Support Support HRAdmin Support HRAdmin Table 4-1
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SELECT * FROM HumanResourcesEmployee SELECT * FROM Employee SELECT * FROM dboErrorLog SELECT * FROM ErrorLog SELECT * FROM ErrorLog SELECT * FROM Employee SELECT * FROM HumanResourcesErrorLog Addressing Schema Objects
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Succeed Succeed (default schema) Succeed Succeed (default schema) Succeed (dbo schema) Fail (no schema name and not in default schema or dbo) Fail (object isn t in this schema!)
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To talk briefly about how other applications may connect to a SQL Server database, applications can specify what database to connect to as part of their connection string It is a best practice for applications to explicitly connect to their target database, and to only specify three-part object names when accessing objects in a different database
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Working with Schemas
Creating a schema is simply a case of specifying a schema name and the schema owner (if none is specified, then the owner will default to the dbo User) You can do this from the Schema New dialog box (see Figure 4-2), which you can access either from
Figure 4-2
The Schema New dialog box
4: Database Objects
the context menu of the Schemas node in Object Explorer or by using the CREATE SCHEMA statement For example:
CREATE SCHEMA Accounts AUTHORIZATION AccountsAdmin
Moving Objects Between Schemas
Objects may be moved between schemas in SQL Server, but doing so causes any permissions explicitly set on that object (see 5) to be dropped The object s schema can be reassigned from the object s designer pages in Management Studio (see the section Working with Data Objects for examples covering multiple object types) or by using the following script:
USE AdventureWorks2008 GO ALTER SCHEMA HumanResources TRANSFER PersonPerson GO
Synonyms
Another SQL Server object that is likely to catch the eye of the Oracle administrator, but is far from commonly used by SQL Server administrators, is the synonym As with Oracle, synonyms are aliases or alternative names by which tables, views, stored procedures, and other programmatic objects can be addressed Synonyms can refer to remote objects, making them appear local, and can make objects in one schema appear as if they reside in another While SQL Server DBAs have not traditionally used synonyms to support addressing objects outside of schemas or databases (like schemas, synonyms were introduced in version 2005), they can be very useful in abstracting changes to the location of underlying objects from clients In this scenario, the moved object is replaced by a synonym in the old location that references the object in the new location Figure 4-3 shows creating a synonym that would allow the failing call by HRAdmin described in Table 4-1 to succeed
Microsoft SQL Server 2008 Administration for Oracle DBAs
Figure 4-3
Creating a new synonym
Schema Objects
As you can see in the following table, the objects that are found in SQL Server databases will be very familiar to Oracle administrators, with the majority of the principal object types having exact counterparts in SQL Server
4: Database Objects
Oracle
Table Index View Synonym Sequence Procedure Function Package
SQL Server
Table Index View Synonym N/A* Stored procedure Function N/A
*The SQL Server objects that provide some of the capabilities of Oracle sequences are described in the section Identity Columns and Sequences later in the chapter
The fact that SQL Server does not implement anything that acts as an Oracle package will mostly be of interest to those who are familiar with this functionality in Oracle and are now looking to build applications in SQL Server As demonstrated above, SQL Server schemas give application developers a means of creating logical groupings of objects, and while this does not provide a way of passing application state between objects in the same way as package-scoped variables, there are means available to SQL Server developers to achieve the same end A common solution is to use temporary tables, which are discussed later in the chapter After we take a brief look at the programmatic objects available in SQL Server, the remainder of this section looks at those objects that allow developers and administrators to effectively store data in a SQL Server database, namely the types of tables and indexes available and how views can be used to aid data retrieval and modification The next section looks at some common administrative tasks associated with these objects
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