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The default behavior of the foreign key is NO ACTION. If the foreign key finds an error and NO ACTION is specified, SQL Server rolls back the statement that violated the constraint and raises an error message. SET NULL and SET DEFAULT each cause all the referenced values to be set to either NULL (for SET NULL) or DEFAULT (for SET DEFAULT that is, the default defined on the column) instead of raising an error and rolling back the statement. In the relationship between the Orders and Customers tables shown in the code sample, if a customer is deleted, the CustomerID column is set to NULL for all orders belonging to that customer and no error message is sent to the calling application.

Table 1-5

You create a new SQL Server error log each time you start an instance of SQL Server. You should view the SQL Server error log to ensure that processes have completed successfully (for example, backup and restore operations, batch commands, and scripts). This can help you to detect any current or potential problem areas, including automatic recovery messages particularly if an instance of SQL Server has been stopped and restarted kernel messages, and so on.

RAID Type RAID 0 (stripe set with out parity) RAID 1 (mirrored volume) RAID 5 (stripe set with parity) RAID 10 (stripe of mirrors)

5

Fault Tolerance None One disk may fail One disk may fail Half of the disks may fail (but not both disks in any mirrored pair)

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The CASCADE action causes SQL Server to delete referenced rows for a delete statement (ON DELETE) and update the referenced values (ON UPDATE) for an update statement. Using the same code sample, if the CustomerID column is changed for a row in the Customers table, all corresponding rows in the Orders table are updated with the same CustomerID to reflect the change. If ON DELETE CASCADE is specified for the foreign key constraint and a row in the Customers table is deleted, all referencing rows in the Orders table are deleted. This might sound reasonable, but it might not be possible to implement CASCADE for all foreign key constraints because cyclic references are not supported. For example, in the following script, an error will be raised when you try to add the foreign key FKCustomersLastOrder because it will introduce a cyclic reference. If a customer is deleted, all referencing orders must be deleted, and all customers referencing those orders through the LastOrderID column must be deleted.

Performance Best read and write Good read, acceptable write Excellent read, fairly poor write Excellent read and write

You can use the sp_cycle_errorlog system stored procedure to cycle the error log files without having to restart the instance of SQL Server. Typically, SQL Server retains backups of the previous six logs and gives the most recent log backup the extension .1, the second most recent the extension .2, and so on. The current error log file (ERRORLOG) has no extension. You can view the SQL Server error log by using SSMS or any text editor. By default, the error log file and backup files are located in the \Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\ folder.

Exam Tip On the 70-443 exam, RAID types (such as 0, 1, and 5) are used interchangeably with their descriptive names (stripe set without parity, mirrored volume, and stripe set with parity). Make sure that you understand the costs and benefits of RAID 0, RAID 1, and RAID 5. Finally, note that RAID 10 is not emphasized on the 70-443 exam, even though it is appearing more frequently in the real world.

CREATE TABLE Test.Customers ( CustomerID INT PRIMARY KEY ,LastOrderID INT NULL ); CREATE TABLE Test.Orders ( OrderID INT PRIMARY KEY ,CustomerID INT NOT NULL REFERENCES Test.Customers ON DELETE CASCADE ON UPDATE NO ACTION ); ALTER TABLE Test.Customers ADD CONSTRAINT FKCustomersLastOrder FOREIGN KEY (LastOrderID) REFERENCES Test.Orders (OrderID) ON DELETE CASCADE ON UPDATE NO ACTION

1. If your only concern is to improve performance, which RAID should you choose 2. When might you want to dedicate an entire drive set to tempdb

In the previous example, consider what happens if a customer is deleted all of the customer s orders are also deleted. This might be fine, but consider the following example:

1

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