c# rdlc barcode font Figure 10-27 Replication Monitor in Visual Studio .NET

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Figure 10-27 Replication Monitor
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MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
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Configuring Warnings and Alerts
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Replication allows you to configure many warnings and alerts By clicking on the Warnings And Agents tab and selecting Configure Alerts, you are given a choice of many warnings and alerts to choose from Warnings are listed next:
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Long merge over dialup connection Long merge over LAN connection Slow merge over dialup connection Slow merge over LAN connection Subscription expiration Transactional replication latency
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EXAM TIP The warnings for either long or slow merges over different types of connections can be very helpful in determining if merge replication is experiencing problems due to the network infrastructure It could be that the merge replication is configured as best as possible, but connectivity problems are preventing merge replication to complete in a timely manner Creating a warning with an alert allows you to be notified as soon as the problem is encountered Other alerts are
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Agent custom shutdown Agent failure Agent retry Agent success Expired subscription dropped Subscriber has failed data validation Subscriber has passed data validation Subscription reinitialized after validation failure
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These warnings and alerts tap into the SQL Server Agent service infrastructure We ll explore SQL Server Agent in much more detail in 13, but for now be aware that SQL Server Agent allows us to create alerts that can be used to send email, pages, and send net messages
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If desired, the Replication Monitor can be set up with different watch lists The way that Replication Monitor achieves this is through agents The details of how are better left for another book What you should know is that watch lists can be created and what they can be created for
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10: High-Availability Strategies
As we can see in Figure 10-28, watch lists can be created on:
Worst performing subscriptions Errors and warnings Only subscriptions that are running, or not running
Figure 10-28 Watch lists in Replication Monitor
Tracer Tokens
A new feature in SQL Server 2005 is the Replication Monitor s ability to use tracer tokens When I think of tracers, I think of the old war movies (and some new ones too); tracer bullets light up the path they take, giving immediate feedback as to where they end up Tracer tokens work similarly, without the destruction of the bullets Within SQL Server 2005, a tracer token is a small amount of time-stamped data that is inserted into the publication database transaction log When it reaches the Distributor and/or Subscribers, it can be examined to determine how long it took to get there Of course, if the tracer token never reaches the destination, that gives you some good information too The technical term for this is latency Tracer tokens can be used to easily measure latency EXAM TIP To measure and record latency for Subscribers, configure tracer tokens Tracer tokens are accessed via the Tracer Tokens tab in Replication Monitor
MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
The Tracer Tokens tab appears in transactional replication publications, but not in merge or snapshot publications In Figure 10-29, I have configured a transactional replication publication and launched Replication Monitor to show it
Figure 10-29 Replication Monitor with the Tracer Tokens tab
Clustering
The ultimate high-availability solution is clustering Clustering involves another completely separate server that can be used in case a primary server fails A primary benefit of a cluster solution is automatic failover of the entire server In other words, when a primary server fails, it s automatically sensed and another server takes over Servers within a cluster are called nodes Take a look at Figure 10-30 for a simple diagram of a two-node cluster
Figure 10-30 Two-node cluster
Node 1 SQL server
Data Virtual server Single IP
Node 2 SQL server
From the client s perspective, it doesn t know it s communicating with a cluster, or even know which node it s communicating with Once a cluster is configured, it is presented to the client as a single virtual server with a single IP address This IP address would be mapped to a name in DNS the same as any other hosts in the network would
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