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The purpose of this chapter is to educate DBAs on how to get maximum performance from their high-performance transactional replication topology across all versions and editions. Most DBAs are concerned with latency in other words, how old the transactions are when they are applied on the Subscriber. To set expectations, you should know that the minimum latency of any transactional replication solution will be several seconds (lower limits are between 1 and 2 seconds). Should you need replication solutions which require lower latencies, you should look at products like Golden Gate, which is an IP application that piggybacks off the Log Reader Agent. Focusing solely on latency will not give you a good indication of replication performance. The nature of your workload can itself contribute to larger latencies. For example, transactions consisting of single insert statements can be replicated with small latencies (that is, several seconds), but large batch operations can have large latencies (that is, many minutes or even hours). Large latencies in themselves are not necessarily indicative of poor replication performance, insufficient network bandwidth, or inadequate hardware to support your workload. Consequently, in this study we ll be looking at the following: Throughput The number of transactions and commands SQL Server can replicate per second. These can be measured by the performance monitor counters SQLServer:Replication Dist:Dist:Delivered Trans/sec and SQLServer:Replication Dist:Dist:Delivered Cmds/sec. Worker time How long it takes for SQL Server to replicate a fixed number of transactions and commands. This statistic is logged when the replication agents are run from the command line. Latency How old the transactions are when they arrive at the Subscriber. Latency can be measured using the performance monitor counter SQLServer:Replication Dist:Dist:Delivery Latency.

count of Finder windows is not greater than 1, as shown in boldface here:

Directly Heated Cathode In some tubes, the filament also serves as the cathode This type of electrode is called a directly heated cathode The negative supply voltage is applied directly to the filament The filament voltage for most tubes is 6 V or 12 V dc It is important that dc be used to heat the filament in this type of tube, because ac will tend to modulate the output The schematic symbol for a diode tube with a directly heated cathode is shown in Fig 29-2A Indirectly Heated Cathode In many types of tubes, the filament is enclosed within a cylindrical cathode, and the cathode gets hot from the IR radiated by the filament This is an indirectly heated cathode The filament normally receives 6 V or 12 V ac or dc In an indirectly heated cathode arrangement, ac does not cause modulation problems, as it can with a directly heated cathode tube The schematic symbol for a diode tube with an indirectly heated cathode is shown in Fig 29-2B Because the electron emission in a tube depends on the filament or heater, tubes need a certain amount of time to warm up before they can operate properly This time can vary from a few seconds

Although these performance monitor counters are the best way to get a handle on your current throughput and latency in your production environments, in this study we ll be focusing primarily on throughput. We ll focus mainly on worker time, or how long the distribution agent has to work to replicate a given set of commands. We ll focus on the Distribution Agent metrics, as the Log Reader is rarely the bottleneck in a replication topology. Additionally the Log Reader Agent operates asynchronously from the Distribution Agent; therefore, the Log Reader Agent can keep current with reading the log, while the Distribution Agent can be experiencing high latencies. By studying the output of the replication agents themselves, when you replay your workloads through them (or measure your workloads as they are replicated by the agents), you can determine the optimal configuration of profile settings for your workloads, and determine how to group articles into different publications for the maximum throughput. This chapter assumes that you have a good understanding of replication concepts. Should you be unfamiliar with replication concepts, I advise you to study the section Replication Administrator InfoCenter in Books Online, accessible online at http:/ / msdn.microsoft.com/en-us/library/ms151314(SQL.90).aspx. Before we begin it is important to look at factors that are the performance kiss of death to any replication solution. After we look at these factors and possible ways to mitigate them, we ll look at tuning the replication agents themselves for maximum performance.

The following factors will adversely affect the throughput of any replication solution: Batch updates Replicating text Logging Network latency Subscriber hardware Subscriber indexes and triggers Distributor hardware Large numbers of push subscriptions We ll look at each of these in turn.

tell the application "Finder" repeat if (count of Finder windows) is not greater than 1 then exit repeat end repeat end tell