Performance Monitoring in Visual Basic .NET

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SQL Server, ensure you have at least 80 MB available for the Windows operating system. If the value in this counter falls below that amount, consider adding RAM.
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Memory: Pages/sec Shows the number of pages that are read from or written to disk. If this counter averages 20, and no other processes are running on the SQL Server 2005 server, you should again consider adding RAM. Network Interface: Bytes total/sec Shows the amount of traffic through your network interface in bytes per second. You need to compare the value in this counter with baseline values. A sudden rise in the value could indicate your server is suffering an external attack. A sudden fall could indicate connectivity problems. Network Interface: Output Queue Length Returns the length of an output packet
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queue in packets. A sustained value higher than 2 indicates network congestion.
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Paging File: % Usage Shows the percentage of the page file that is being utilized.
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If you see more than 70 percent of your page file being utilized, consider adding more RAM for your server.
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PhysicalDisk: % Disk Time Measures hard disk activity. If this counter returns an
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average above 70 percent, you might have hard disk problems. Hard disk problems can, however, be caused by a shortage of RAM, so further investigation is required.
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LogicalDisk: % Free Space Indicates when a logical disk volume typically a disk array is running out of space. This is always important information, but it is particularly so when the volume stores the database transaction logs. Processor: % Processor Time Measures CPU activity. If you have a multiprocessor
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computer, each CPU is an instance of this counter, or you can specify all CPUs as an instance. An average value of 85 percent indicates a serious problem, but if you consistently detect average values greater than 60 percent you should consider upgrading your processors.
Processor: % Privileged Time Returns the percentage of time the processor
spends on execution of Microsoft Windows kernel commands. If the value in this counter is consistently high when the values in the Physical Disk counters are high, or if it is increasing through time, you should consider installing a faster or more efficient disk subsystem. Efficient disk subsystems use less privileged time, leaving more processing time available for user applications and hence increasing overall throughput.
Lesson 1: Defining and Implementing Monitoring Standards for a Physical Server
Process: % Processor Time Measures CPU activity related to a process. Each
process is an instance of this counter. The counter is useful if you suspect that a particular process is using an excessive amount of CPU resources.
Indicates the number of queued threads that are waiting to be processed. If this exceeds two per CPU for a significant length of time, you potentially have a processor bottleneck.
System: Processor Queue Length
Monitoring Server Availability
You can use the following counters to monitor server availability. Again, this list is by no means exclusive:
SQLServer:Access Methods: Full Scans/sec Indicates how many full table or index scans are occurring per second. If this number is significantly higher than the baseline value, application performance might be slow. SQLServer:Buffer Manager: Buffer Cache Hit Ratio
Shows the ratio of pages stored in memory rather than on hard disk. This should be as near to 100 percent as possible, but typically anything above 90 percent is acceptable. A value of 90 percent or below might indicate that SQL Server operation is limited by memory constraints. Shows the number of transactions on a given database or on the entire SQL Server per second. If this number is significantly more than its baseline value, there could be issues with your server or database activity.
SQLServer:Databases: Transactions/sec
Shows t he number of user connections to a SQL Server. If this number is significantly more than its baseline value, there could be a deterioration in SQL Server performance as a result of increased user activity.
SQLServer:General Statistics: User Connections
Monitoring Database Availability and Transaction Log Usage
You can use the following counters to determine the availability of a specific database. If the database is running short of space for transaction logs, this affects availability, and counters that monitor transaction logs are included in this list. As before, the list is not exclusive:
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