The Real MTCS SQL Server 2008 Exam 70/432 Prep Kit- P6 docx

The following SQL code demonstrates how to configure CDC for auditing of a table in a database: --Activate CDC EXEC sys.sp_cdc_enable_db_change_data_capture --Enable CDC on table EXEC sy

The T-SQL procedure to do a Copy Only Backup would look like:

BACKUP DATABASE [robby] TO DISK = N'C:\Backup\robby.bak' WITH COPY_ONLY,

NOFORMAT, NOINIT, NAME = N'robby-Full Database Backup', SKIP, NOREWIND,

NOUNLOAD, STATS = 10

GO

Figure 1.3 The Copy Only Backup Option

TesT Day Tip

Be sure you are very familiar with doing backups and restores both from

a T-SQL standpoint and a GUI standpoint Since this is the bread and

butter of a DBA’s job, you can be sure there will be plenty of questions

about backups, restores, and recovery.

Enhanced Configuration

and Management of Audits

Auditing is available using the new Change Data Capture (CDC) feature CDC can

be used to capture insertions, updates, and deletes in an SQL table in a database and place the changes in another table

The following SQL code demonstrates how to configure CDC for auditing of

a table in a database:

Activate CDC

EXEC sys.sp_cdc_enable_db_change_data_capture

Enable CDC on table

EXEC sys.sp_cdc_enable_table_change_data_capture @source_schema = 'dbo',

@source_name = 'myTable', @role_name = 'cdc'

To read the data from the CDC table, there are a series of system stored procedures and functions available, or you can query the tables directly

System stored procedures:

sys.sp_cdc_add_ job

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sys.sp_cdc_generate_wrapper_function

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sys.sp_cdc_change_ job

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sys.sp_cdc_get_captured_columns

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sys.sp_cdc_cleanup_change_table

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sys.sp_cdc_get_ddl_history

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sys.sp_cdc_disable_db

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sys.sp_cdc_help_change_data_capture

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sys.sp_cdc_disable_table

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sys.sp_cdc_help_ jobs

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sys.sp_cdc_drop_ job

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sys.sp_cdc_scan

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sys.sp_cdc_enable_db

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sys.sp_cdc_start_ job

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sys.sp_cdc_enable_table

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sys.sp_cdc_stop_ job

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System functions:

cdc.fn_cdc_get_all_changes_<capture_instance>

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sys.fn_cdc_has_column_changed

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cdc.fn_cdc_get_net_changes_<capture_instance>

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sys.fn_cdc_increment_lsn

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sys.fn_cdc_decrement_lsn

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sys.fn_cdc_is_bit_set

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sys.fn_cdc_get_column_ordinal

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sys.fn_cdc_map_lsn_to_time

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sys.fn_cdc_get_max_lsn

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sys.fn_cdc_map_time_to_lsn

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sys.fn_cdc_get_min_lsn

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TesT Day Tip

You can count on questions about Change Data Capture on your exam

This new feature makes tracking down changes and auditing much

easier than it has been in the past.

New Table Value Parameter

Passing tables as parameters has been a long time coming The new table type can

be passed to a stored procedure This will solve quite a few problems!

Here’s an example:

To declare a Table User Defined Type in the database:

create type MyTableType as table

(

Name varchar(150),

City varchar(20),

AddressID int

)

And here's the stored procedure that consumes it:

create procedure InsertFriends

@MyTable MyTableType readonly )

as

insert into Friends (Name, city, AddressID) select Name, city, AddressID

from @MyTable;

To fill create and fill the temp table:

declare @MyBestFriends_temp MyTableType

insert into @MyBestFriends_temp values ('Debbie', 'Havertown', 2)

insert into @MyBestFriends_temp values ('Chris', 'Philadelphia', 1)

insert into @MyBestFriends_temp values ('Tom', 'Garden City', 11)

insert into @MyBestFriends_temp values ('Greg', 'Lansdowne', 6)

insert into @MyBestFriends_temp values ('Steve', 'Wilmington', 6)

And finally, to execute:

execute InsertFriends @MyBestFriends_temp

FileStream Data Types

FileStream data types are a new, interesting feature in SQL SERVER 2008 Basically, the database engine will store all of the data associated with the column in a disk file as opposed to the actual database You might have used a similar home-grown scheme in earlier versions of SQL, but this integrates everything nicely into SQL Server

In order to use FileStream, you must first enable it This is accomplished via the

sp_FILESTREAM_configure system stored procedure, or via the GUI in

Management Studio under advanced settings.

Once FileStream is enabled, a file group must be added to the database in order for it to be able to use FileStream data types

FileStream has the following limitations:

Database mirroring cannot be configured in databases with FileStream data

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Database snapshots are not supported for FileStream data

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Native encryption is not possible by SQL Server for FileStream data

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exam Warning

Be sure you remember the limitations of FileStream data types!

Sparse Column Support

Sparse columns are a new addition to SQL Server Sparse columns allow for the

optimized storage of null columns Sparse columns can be a good thing, but be sure to enable them only on columns that contain sparse data, or your storage requirements

may go up instead of down

To enable a column as a sparse column, use the create statement in SQL or

change the properties in the column to Sparse (see Figure 1.4).

Figure 1.4 Enabling a Column as a Sparse Column

The SQL to accomplish this is as follows:

CREATE TABLE dbo.Table_1

(

OID int NULL,

MyValue1 varchar(50) SPARSE NULL

) ON [PRIMARY]

GO