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You can use both the SQL Server error log and the Windows application event log to identify the cause of problems. For example, while monitoring the SQL Server error log, you might encounter error messages that do not contain cause information. By comparing the dates and times for events between these logs, you can narrow the list of probable causes. The SSMS Log File Viewer lets you integrate SQL Server, SQL Server Agent, and the Windows logs into a single list, making it easier to correlate related Windows application events and SQL Server events. Although the Windows application event log is the most useful for displaying SQL Server errors and events, you should not ignore the other event logs on a SQL Server 2005 server. Three logs are available:

When you are designing your storage solution, consider that your choice of RAID for each volume affects the number of reads and writes that have to be processed. RAID 1 and RAID 10, for example, each generate one additional read operation for each write operation. RAID 5, however, generates four I/O operations (two reads and two writes) for each write. After I/Os are adjusted for these RAID types, you can determine the I/O load on each disk. Table 1-6 shows the calculation associated with each of these RAID types.

CREATE TABLE Test.Countries ( CountryID INT PRIMARY KEY ); CREATE TABLE Test.Cities ( CityID INT PRIMARY KEY ,CountryID INT NOT NULL REFERENCES Test.Countries ON DELETE CASCADE ); CREATE TABLE Test.Customers (

Table 1-6

RAID Type RAID 0 (stripe set without parity) RAID 1 (mirrored volume) RAID 5 (stripe set with parity) RAID 10 (stripe of mirrors)

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You can double-click an agent to access information in a detail window. The agent detail windows provide information about agent sessions, including start time, end time, duration, and the actions performed in a session. The error messages provide detailed information about why an agent is not running, and they assist you in troubleshooting issues with the agents associated with a publication. Replication Monitor also provides a context menu for the publications node. You can right-click a publication in the left pane to choose one of the following tasks:

CustomerID INT PRIMARY KEY ,CityID INT NOT NULL REFERENCES Test.Cities ON DELETE CASCADE ); CREATE TABLE Test.Orders ( OrderID INT PRIMARY KEY ,CustomerID INT NOT NULL REFERENCES Test.Customers ON DELETE CASCADE );

I/Os per Disk Calculation (reads + writes) / number of disks [reads + (2 writes)] / 2 [reads + (4 writes)] / number of disks I/Os per disk = [reads + (2 writes)] / number of disks

In this example, if you delete a country, all cities in that country, all customers in those cities, and all orders belonging to those customers are also deleted. Be cautious you might be deleting more than you think. Consider someone executing the query DELETE Test.Countries WHERE CountryID = 1; from SQL Server Management Studio. The person might think he is deleting only one row in the Countries table when he might actually be deleting millions of rows. The time it takes to execute this delete statement depends on how many rows are being deleted. When it finishes, SQL Server Management Studio will return the following message:

Although all fault-tolerant RAID configurations increase the number of I/Os per formed by the system, it is important to remember that this increased number of I/Os is divided among more disks. As a result, if a RAID configuration is properly designed, it should have the net effect of lowering, not raising, the I/O load on each disk. In fact, a key concept in sizing the disk I/O subsystem is that the more physical disks you add to your RAID configuration, the fewer I/Os per disk. Because all disks have physical throughput limitations, such as 300 IOPS, it is often necessary to add disks to a configuration for the sole purpose of bringing the IOPS per disk down to a level that can be handled by each disk. (Note, however, that every system has a maximum I/O bus capacity beyond which I/O throughput cannot be increased merely by add ing disks.)

When deciding between SCSI and ATA disk types, understand that SCSI tends to be faster, smaller, more reliable and more expensive. Beyond SCSI, SATA and iSCSI offer even better performance at an even higher price.

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