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The default Replication Alert settings
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In addition to the tools available within Enterprise Manager, you can monitor performance using other Windows NT/2000 tools. For more information on using Performance Monitor, see 3, Data Protection in Windows NT/2000. In this section, we ll look at some specific parameters that are related to replication performance. When SQL Server is installed, you ll be able to access various Performance Monitor counters related to replication. The easiest way to access a Performance Monitor chart with useful information is to right-click the Replication Monitor item in Enterprise Manager and select Performance Monitor. This automatically opens a chart with useful information pertaining to replication (see Figure 8-21). Table 8-2 lists some of these objects and counters.
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Figure 8-21.
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Using Performance Monitor to view replication performance
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Object SQLServer: ReplicationAgents
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Instance Distribution Logreader Merge Snapshot [list of publications]
Notes Displays performance information related to the various Agents that perform replication tasks. Useful for measuring the latency between various Subscribers, and can reflect current network conditions. Useful for measuring the latency between various Subscribers, and can reflect current network conditions and resource usage of the current server. Measures the amount of activity being recorded in merge replication; useful for determining data modification and usage statistics. Indicates how many replication conflicts have occurred at Subscribers. A high number indicates that many Subscribers are updating the same information and that important data might be overwritten in conflict resolution. Indicates the number of commands executed per second in snapshot replication. Useful for determining how many changes are being replicated per unit time and evaluating the performance of the overall synchronization.
SQLServer: ReplicationDist
Dist:Delivery Latency
SQLServer: LogReader
Logreader:Delivery Latency
[list of publications]
SQLServer: ReplicationMerge
UploadedChanges/ Sec
[none]
SQLServer: ReplicationMerge
Conflicts/Sec
[none]
SQLServer: Replication Snapshot
Snapshot:Delivered Cmds/sec
[list of publications]
Table 8-2.
Useful SQL Server Replication Performance Counters
SQL Server 7 Backup & Recovery
You ll probably want to customize the default Performance Monitor options to highlight important information. On busy servers, this is a good way to measure the performance impact of enabling various types of replication and their settings. Also, depending on these settings, you might want to also change the interval used for monitoring replication performance statistics. The default update rate may be too high on servers that experience moderate usage. Finally, it s important to realize that other processes may be competing for resources on the same server. If replication transaction throughput is low, the problem might be related to one of many different parameters. For example, if your network connections are saturated, the servers may not be able to communicate properly. On the other hand, if your server is extremely busy, the problem might be due to database server processes competing for memory and CPU resources in generating and updating replication information. In any case, using Performance Monitor can help to determine the causes and effects of enabling replication on your servers.
STANDBY SERVERS
In many scenarios, it s important to make sure that your database server is available, even under the worst-imaginable circumstances. In such situations, it might be practical to purchase and maintain a second installation of SQL Server 7 that is kept up-to-date with production database information. In the event of a failure of the primary database server, you can redirect users to access the new machine. This method has several advantages: w If a loss of information does occur, you can easily use a second, live copy stored on another machine. This second copy can include all user databases and the system databases. Regardless of the type of failure whether a failed hard disk or the entire server another replica of the information is available for use immediately.
Backup and recovery can address some of these issues. For example, if I have a completely redundant server and a failure occurs in the production server, I can immediately start restoring information from a recent backup. However, this operation will take time that can be quite costly. This is a good situation for the implementation of standby servers.
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