Microsoft SQL Server 2008 Administration for Oracle DBAs in VS .NET

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Microsoft SQL Server 2008 Administration for Oracle DBAs
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they are called partition aligned, or the indexes can be unpartitioned or stored on a different partition scheme In SQL Server, a table can only be partitioned on a single column, and cannot be subpartitioned There is also a wizard in the GUI to partition an existing table, available in the context menu for the table under Storage | Create Partition Existing partition schemes and partition functions can be viewed in Object Explorer, as shown in Figure 4-31 Tables and indexes can now be assigned to this partition scheme in exactly the same way as specifying a standard filegroup In doing this, we need to specify which column will provide the values that will be evaluated as rows are placed in partitions:
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CREATE NONCLUSTERED INDEX [IX_Invoice_InvoiceDueDate] ON [Accounts][Invoice] ( [CustomerID] ASC, [InvoiceDueDate] ASC ) INCLUDE ([CustomerRefNo]) ON [PS_InvoiceInvoiceDueDate] ([InvoiceDueDate]) GO
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To give an example of a common operation performed against a single partition, we can now rebuild only the latest partition of this index To do this we need to determine
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Figure 4-31 Partition Schemes and Functions in Object Explorer
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4: Database Objects
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a value known as the destination_id for the partition, for which we can use the following query (which aliases this column as Partition No):
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SELECT dsname AS [Filegroup], ddsdestination_id AS [Partition No], psname AS [Scheme] FROM sysdata_spaces ds JOIN sysdestination_data_spaces dds ON (dsdata_space_id = ddsdata_space_id) JOIN syspartition_schemes ps ON (psdata_space_id = ddspartition_scheme_id) ORDER BY dsname, psname ASC
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The result of running this query is shown in Figure 4-32 We can now use this value when rebuilding the index:
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ALTER INDEX IX_Invoice_InvoiceDueDate ON [Accounts][Invoice] REBUILD PARTITION = 5 GO
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The $PARTITION function can also be very useful when working with partitions or when testing new partition functions, as it can return the partition number for a given value or set of values For example:
ALTER INDEX IX_Invoice_InvoiceDueDate ON [Accounts][Invoice] REBUILD PARTITION = $partitionPF_InvoiceInvoiceDueDate('20100901') GO
Figure 4-32 Identifying partitions
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5
Security
In This
Security Objects Protecting SQL Server Databases
Microsoft SQL Server 2008 Administration for Oracle DBAs
his chapter describes the features available in SQL Server that allow administrators to effectively control access to database objects and data It also describes the database features that can further enhance security within a SQL Server installation Where there are security implications for administrators in carrying out tasks that are described elsewhere in this book, those implications are discussed in the relevant chapters This chapter does not attempt to highlight every aspect of SQL Server that, through misconfiguration or improper deployment, can act to create security vulnerabilities, nor does it try to list every tool or technique for addressing these vulnerabilities Put simply, there are so many factors outside of any database system that can influence its operational security, from physical access through to operating system and network configuration, that becoming an expert in this field takes many years and is beyond the scope of this book
NOTE
The chapter introduces a SQL Server object called a User To differentiate this object from a person initiating a database request, the SQL Server object is always capitalized ( User ) and the more general term is written in lowercase ( user )
Security Objects
The model for controlling access to a SQL Server database is built from a combination of many types of objects, from those working at a very high level, representing people or applications, to very fine-grained objects that allow us to associate the granting or denying of individual privileges (permissions) with objects such as tables and columns The way these objects come together will be very familiar to Oracle administrators, with possibly two subtle differences to keep in mind: To control access to SQL Server database objects, a combination of security objects at both the instance and database level is required There is no logical 1:1 relationship between SQL Server Users and schemas (or the functional equivalent of the Oracle schema, the SQL Server database)
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