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The next step after you have identi ed the main types of waits and resources involved represents a junction in the tuning process Based on your discoveries thus far, you will determine a course of action for further investigation In our case, we need to identify the causes of I/O, parallelism, network-related waits, and transaction log related waits (minor); we will then continue with a route based on our ndings But if the previous steps had identi ed blocking problems, compilation/recompilation problems, or others, you would need to proceed with a completely different course of action The I/O-related waits (including I/O latches and write log waits) require us at this point to drill down to the database level I explain how this is done in the next section.

On the Companion CD Open the 1202_Knowledge.xlsx file on the CD-ROM . Nobody can know everything, and not even everything there is to know about Excel, apparently . But you don t need to; at least not all the time . The ability to forget is a powerful and useful one . I freely admit that I often have to refer to my own books when dealing with many Excel problems and questions . By the way, one of the reasons for writing them . I really hope that you ve managed to retain at least those ideas you found most relevant to you as you worked your way through this book . Or, if not, that you now know where to find the relevant information . To close, I d like to wish my readers all the best, and to sum up with the following quotation and typical Excel 2007 file (it contains a formula after all!) . It speaks volumes about knowledge, experience, and the ability and desire to get things done: Knowing things is overrated

As I mentioned earlier, the parallelism waits (CXPACKET) occur in parallel query plans when threads wait for an exchange packet from other threads before they can continue work High values in this wait type might indicate that CPU resources are not utilized optimally, especially in OLTP environments where many requests run simultaneously The problem may be mitigated by lowering the maximum degree of parallelism in the server Note that even when queries are restricted to use only one CPU, it doesn t mean that SQL Server cannot utilize more than one CPU; rather, a single query will not be processed with a parallel query plan High values in the CXPACKET wait type can also be caused by using hyperthreading.

Note that high values in CXPACKET wait type do not always represent a direct cause of a problem; instead, they can be a symptom, in which case you will typically see high values in other wait types (for example, I/O latches) Also, it is quite natural in parallel query plans for threads to wait for other threads to nish work So even when you have high values in this wait type, you won t always be able to improve the system s throughput by lowering the maximum degree of parallelism High values in network waits might indicate network bandwidth problems, but they may also indicate other problems For example, the client application may have been written inef ciently and can t consume the data fast enough from the moment it made the request.

This can happen, for example, when the client uses server-side cursors and in between each fetch of a row it does a lot of processing Also, some things that seem obvious to most programmers are not necessarily obvious to everyone This might surprise you, but occasionally we nd applications that do not do any ltering in the database as part of their queries instead, they do the ltering in the application This, of course, can put an enormous load on the network I discuss some of the other performance problems later in these books..

Select Group Policy Management from the Administrative Tools menu. Select the Group Policy object you want to lter and click the Scope tab. On the Scope tab in the Security Filtering section, click Add and locate the groups or users who should have the policy applied to them, as shown in Figure 20-8. Make your selection and click OK.

Subnet Mask (Decimal) 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.240 255.255.255.240

Display Name Application Experience Application Information Application Layer Gateway Service Application Management Background Intelligent Transfer Service Base Filtering Engine Block Level Backup Engine Service Certificate Propagation CNG Key Isolation COM+ Event System COM+ System Application Computer Browser Cryptographic Services DCOM Server Process Launcher Desktop Windows Manager Session Manager DFS Replication Properties

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