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Most of the tuning should be done on the Distribution Agents. Log Reader Agents are rarely bottlenecks. Naturally, you should separate log files on I/O paths different from the data drives to prevent I/O contention; this will help log reader performance. Use the settings ReadBatchSize and ReadBatchThreshold to most significantly improve the Log Reader Agent settings. ReadBatchSize determines when the log reader will distribute the transactions it has read from the log to the distribution database. The default is 500, which means that the log reader will batch up 500 transactions before writing them to the distribution database. ReadBatchThreshold determines when the log reader will distribute the commands it has read from the log to the distribution database. The default for ReadBatchThreshold is 0. This concept is key to understanding how these parameters work: the parameters honor transactional boundaries. For example, if I had a ReadBatchSize and ReadBatchThreshold settings of 500 and 100 respectively, and I issued a batch update which affected 1000 rows, neither of these parameters would trigger a message telling the Log Reader Agent to write the buffered data to the distribution database. If I issued a singleton insert, both transactions would fly as the ReadBatchThreshold is reached (or exceeded). The PollingInterval determines how long transactions will remain in the buffer before being sent to the distribution database even if ReadBatchSize or ReadBatchThreshold have not been exceeded. Figure 3 illustrates the impact of various settings for ReadBatchSize and ReadBatchThreshold.

A loop controlled by a loop variable looks like this:

35000 30000 25000 20000 15000 10000 5000 0 10 100 1000 10000

Some video cameras use a form of electron tube that converts visible light into varying electric currents The two most common types of camera tube are the vidicon and the image orthicon

ReadBatchSize=10 ReadBatchSize=100 ReadBatchSize=1000 ReadBatchSize=10000 default (500)

As you can see, this is pretty straightforward You supply a name for the loop variable, such as myCounter, the start value (for example, 1), and the end value (for example, 10) Optionally, you can supply the increment, the number by which to increase or decrease the value of the loop variable If you don t provide the increment, AppleScript increments the value by 1 on each iteration through the loop This is nice, logical, and effective for many scripts Here s an example of a loop controlled by a loop variable using the default increment of 1 The code sets the startvalue variable to 1, prompts the user to choose the value of the endvalue variable from a choose from list dialog box, and then runs from the value of startvalue to the value of endvalue On each iteration, AppleScript automatically increments the numWindows counter variable by 1:

Figure 3 The effect of worker time with varying settings of ReadBatchSize and ReadBatchThreshold for a workload of 10,000 singleton inserts on the Log Reader Agent

Vidicon In the vidicon, a lens focuses the incoming image onto a photoconductive screen An electron gun generates a beam that sweeps across the screen as a result of the effects of deflecting coils, in a manner similar to the operation of an electromagnetic CRT The sweep in the vidicon is synchronized with any CRT that displays the image As the electron beam scans the photoconductive surface, the screen becomes charged The rate of discharge in a certain region on the screen depends on the intensity of the visible light striking that region A simplified cutaway view of a vidicon tube is shown in Fig 29-7 The main advantage of the vidicon is its small physical size and mass A vidicon is sensitive, but its response can be sluggish when the level of illumination is low This causes images to persist for a short while, resulting in poor portrayal of fast-motion scenes

set startvalue to 1 set endvalue to choose from list {"3", "4", "5", "6", "7"} repeat with numWindows from startvalue to endvalue tell application "Finder" to make new Finder window end repeat

The y axis is worker time in ms, and the x axis is ReadBatchThreshold. As you can see, the higher values produce the lowest worker times for this particular workload. In this case, the workload is 10,000 singleton inserts.

There is no such thing as free lunch. As you may expect, the fragments_persons table incurs overhead. To start with, run these commands:

.

Q: A:

The reserved space for the persons table is 187 MB, whereas the fragments_persons table takes up 375 MB twice the size of the base table. What about the overhead for updates The file 07_trigger_volume_test.sql includes a stored procedure called volume_update_sp that measures the time to insert, update, and delete 20,000 rows in the persons table. You can run the procedure with the trigger enabled or disabled. I ran it this way: