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In some cases, queries that have been parallelized can perform more poorly than the same query running in a serial fashion. The easiest way to determine whether parallelism is causing system performance issues is to follow the normal performance tuning procedures described in 8, and look for CXPacket waits. If a specific SPID is experiencing CXPacket waits, run the query above and note the statement that is executing on that SPID. If it is determined that a specific statement or batch is causing a problem with CXPacket waits, use the MAXDOP 1 query option for that batch and execute it again to see if it performs better. As discussed earlier in this appendix, all user access to data in SQL Server occurs through the buffer cache. When a query is executed, the query engine first checks to see whether the data needed is already present in the buffer cache. If it isn t present, a request is made for the storage engine to read the data into buffer cache. Because the buffer cache is a finite resource, SQLOS must manage the buffer cache very carefully. Developers can assist SQLOS by controlling how their applications access data (for example, group access to similar objects as much as possible), which can help minimize data movement within the buffer cache. SQLOS provides a mechanism in the form of the sys.dm_os_buffer_descriptors DMV that enables developers to peer into buffer cache and determine which objects currently have pages in buffer cache. The following query will provide a list of all objects and the number of pages from that object currently in buffer cache:

9. 10. 11. 12. 13. 14. 15.

Figure 7-12

7-36

17. 18.

SELECT count(*)AS cached_pages_count ,name ,index_id FROM sys.dm_os_buffer_descriptors AS bd INNER JOIN ( SELECT object_name(object_id) AS name ,index_id ,allocation_unit_id FROM sys.allocation_units AS au INNER JOIN sys.partitions AS p ON au.container_id = p.hobt_id AND (au.type = 1 OR au.type = 3) UNION ALL SELECT object_name(object_id) AS name ,index_id, allocation_unit_id FROM sys.allocation_units AS au INNER JOIN sys.partitions AS p ON au.container_id = p.hobt_id AND au.type = 2 ) AS obj ON bd.allocation_unit_id = obj.allocation_unit_id WHERE database_id = db_id() GROUP BY name, index_id ORDER BY cached_pages_count DESC;

7

Finally, for the desired computers to inherit the options of the new class, you need to set the class ID of appropriate client computers to match the ID you have defined for that class at the DHCP server. You can achieve this task by executing the Ipconfig /setclassid command at a command prompt at each client computer. The user class option permits only one class ID to be used for identifying clients. In other words, each client computer can be identified as a member of only a single user class at the DHCP server. To create a new user or vendor class, complete the following steps: 1. Open the DHCP console. 2. In the console tree, select the applicable DHCP server. 3. JFrom the Action menu, select one of the following:

On the Specify Table Types page, specify vAssocSeqOrders as the case and vAssocSeqLineItems as the nested table. Click Next. On the Specify The Training Data page, clear the check box showing that the CustomerKey column is the key column (it is selected by default), and specify OrderNumber as a key column, LineNumber as a key and input column, and Model as an input and predictable column, as Figure 9-10 shows. Click Next.

To create a new user class, select Define User Classes. To create a new vendor class, select Define Vendor Classes.

The output of this query is shown in Figure B-11.

4. JClick Add. The New Class dialog box opens. 5. JIn the Display Name text box, provide a friendly name for the class. Optionally, fill in the Description text box. 6. JIn the ID text box, set the same binary or ASCII string that matches the DHCP class ID string that is either implemented or set at member clients. 7. Click OK and then Close to return to the DHCP console. To set DHCP class ID information at a client computer, complete the following steps: 1. JAt a DHCP-enabled client computer running Windows 2000, Microsoft Windows XP, or Windows Server 2003, open a command prompt. 2. JUse the Ipconfig /setclassid command to set the DHCP class ID the client uses when obtaining its lease from the DHCP server. You can use the Ipconfig /setclassid command as demonstrated in the following example command, which sets an ASCII string (MyNewClassId) as the DHCP class ID string for the local area network (LAN) connection in use at the client computer:

19. 20. 21. 22. 23. 24. 25. 26. 27. 28.

C:\>ipconfig /setclassid Local Area Connection MyNewClassId Windows IP Configuration Successfully set the class id for adapter Local Area Connection.

Figure B-11

Note You can use the Ipconfig /showclassid <adapter number> command to display all the DHCP class IDs allowed by the DHCP server for any network adapter installed on your computer.