MCITP SQL Server 2005 Database Administration All-in-One Exam Guide in VS .NET

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MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
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TIP As a general rule, if a queue is more than 2, it may be a bottleneck This goes for counters with any objects such as System object:Processor Queue Length counter, Server Work Queues object:Queue Length counter, Network Interface object:Output Queue Length counter, and more A queue is a waiting line Any time more than two of anything are waiting in line, it deserves further investigation At the very least, it deserves a comparison with the baseline One of the counters available in the Logical Disk object is the Logical Disk:% Free Space counter This can be used to identify any time a disk drive space falls below a given threshold
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You can use the Network Interface object to measure activity on any NICs you have installed The NetworkInterface:Bytes Total/sec counter measures the rate at which data is sent and received over the NIC As with many counters, if measured against the baseline, it can give you insight into how activity is increasing over time As with many tasks, sometimes the simplest way is the easiest way You can press CTRL-SHIFT-ESC to launch Task Manager and look at the Networking tab This tells you what the link speed is, and the percentage that s being utilized
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SQL Counters
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There are several counters added when you install SQL Server, as we can see in Figure 6-16 These counters can be used to measure specifics related to SQL Server For example, you may be interested in how efficiently SQL Server is using the memory, or want to be alerted when a transaction log exceeds a certain size The SQL Server Buffer Manager and SQL Server Memory Manager objects have many counters that can be very useful when you need to measure how effectively SQL Server is using memory Some of these are
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SQL Server:Buffer Manager:Buffer Cache Hit Ratio SQL Server:Buffer Manager:Total Pages SQL Server:Memory Manager:Total Server Memory (KB)
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The SQL Server Databases object can be used to measure specifics on individual databases A couple of the individual counters that can be used to measure sizes of files are listed next:
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Data File(s) Size (KB) Log File(s) Used Size (KB)
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6: Server Infrastructure Design
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In the following exercise, we ll explore the real-time measurement capability of System Monitor
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Figure 6-16 SQL Server objects in System Monitor
Exercise 61: Exploring System Monitor 1 Choose Start | Administrative Tools | Performance Alternatively, you could type perfmon from the command line or the run box Notice that the default counters for the CPU, memory, and disk objects have been added 2 Click the plus (+) in the toolbar Select the Process performance object The % Processor Time counter is selected by default Under Select instances from list, select the sqlservr process, as shown in Figure 6-17 Click Add 3 Select the SQL Server:Buffer Manager performance object The Buffer Cache Hit Ratio counter is selected by default Click Add 4 In the Add Counters dialog box, click Close to return to the graph display 5 Click on the Pages/sec counter in the bottom pane of System Monitor Record the Last, Average, Minimum, and Maximum values for this counter The default Duration (length of time the graph will display) is 1 minute and 40 seconds (1:40)
MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
Figure 6-17 Monitoring the sqlservr process in the Process object
6 Click on the Avg Disk Queue Length counter and record the values 7 Click on the % Processor Time counter and record the values 8 Launch a few programs such as Word, Internet Explorer, Outlook, or something else on the computer you re using Now look at the counters again, and notice that the average and maximum values have changed 9 You decide you want to remove the Pages/sec counter Select the Pages/sec counter in the bottom pane of System Monitor and press DELETE
Baseline
We ve mentioned a baseline a few times in this chapter, but haven t really explained it In this context, a baseline is a set of measurements for a server created in a counter log A baseline log would be captured over a period of time, often a week We capture data during peak time and off-peak time to ensure we truly know the load at any given time However, rather than capture the data every minute of every day, we would instead take snapshots throughout the day or week for a baseline Snapshots are typically taken at intervals such as every 15, 30, or 45 minutes The goal is to find a balance where we can measure the server without adding much additional load on the server For a server in any role such as an application server (running Microsoft Exchange or Microsoft SQL Server), a Domain Controller, or a network infrastructure server (such as DHCP [Dynamic Host Configuration Protocol] or DNS [Domain Name System]), it s a sound practice to have a baseline At the very least, the core four resources (CPU, memory, disk, and NIC) are measured Then, based on the role, additional counters are measured such as Buffer Manager counters on an SQL Server For example, if I came into a company as a new hire and was tasked with managing and maintaining a set of SQL Servers, I might be interested in viewing the baseline Let s say one doesn t exist No problem I d make it a priority to create a baseline for each of the servers
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