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Extended Events are likely to become the preferred method of monitoring and troubleshooting; therefore, the following are some possible usage scenarios: Monitoring system activity using Extended Events and Event Tracing for Windows (ETW) Determining which queries are holding locks Finding objects with the most locks taken on them Determining which queries are exceeding certain thresholds (such as a specified duration) Tracking waits Tracking spinlock contention (spinlocks are low-level synchronization objects used to protect access to resources for short periods of time) Investigating latch contention Generating a user dump

tell the application id "comappleitunes" try set MyGimmes to every track whose name is "Gimme Shelter" repeat with myCounter from 1 to count of MyGimmes play the item myCounter of MyGimmes delay 5 display dialog "Keep playing this version, or play the next " buttons {"Keep Playing This Version", "Play the Next Version", "Cancel"} with title "Gimme Shelter"

4 In an amplifier that employs a P-channel JFET, the device can usually be replaced with an N-channel JFET having similar specifications, provided that (a) all the resistors are reversed in polarity for the circuit in question (b) the power supply polarity is reversed for the circuit in question (c) the drain, rather than the source, is placed at signal ground (d) the input is supplied to the drain, rather than to the gate (e) the output is taken from the source, rather than from the drain 5 At the exact moment a 60-Hz ac sine wave is at its positive peak voltage, the instantaneous rate of change in the voltage is (a) large and positive (b) small and positive (c) large and negative (d) small and negative (e) zero 6 In order for a bipolar transistor to conduct under conditions of no signal input, the bias must be (a) in the forward direction at the emitter-base (E-B) junction, sufficient to cause forward breakover (b) in the reverse direction at the E-B junction, but not sufficient to cause avalanche effect (c) such that the application of a signal would cause the transistor to go into a state of cutoff (d) such that the application of a signal would cause the transistor to go into a state of saturation (e) such that the application of a signal would cause the transistor to become nonlinear 7 The risk of electrocution to personnel who service live electrical or electronic equipment increases in proportion to the (a) maximum amount of power, in watts, that the equipment demands (b) maximum amount of energy, in watt-hours, that the equipment consumes (c) maximum amount of current, in amperes, that the equipment draws (d) maximum potential difference, in volts, that exists in the equipment (e) maximum resistance, in ohms, that exists in the equipment 8 In a logical AND gate with four inputs, the output is high if and only if (a) none of the inputs are high, and all four are low (b) one of the inputs is high, and the other three are low (c) two of the inputs are high, and the other two are low (d) three of the inputs are high, and the other one is low (e) all four of the inputs are high, and none are low 9 Fill in the blank in the following sentence to make it true: A receiver derives its audio output by mixing incoming signals with the output of a tunable local oscillator (a) crystal set (b) direct conversion.

The number of usage scenarios is quite large and beyond the scope of this chapter. But, to give you another example of using XEVENT, listing 7 shows how to generate a user dump when an error occurs.

Figure 12-1 Using a custom dialog box to choose whether to keep playing the current version of a song or start playing the next version

USE master; GO -- trigger a user dump for the error 208 -- 'Invalid object name' CREATE EVENT SESSION GenerateUserDump ON SERVER ADD EVENT sqlos.exception_ring_buffer_recorded ( ACTION (sqlserver.create_dump_single_thread) WHERE (error = 208 and state=1 and package0.counter < 2)); GO ALTER EVENT SESSION GenerateUserDump ON SERVER STATE=START; GO -- Generate the 208 error SELECT * FROM NonExistentTable; -- Cleanup DROP EVENT SESSION GenerateUserDump ON SERVER; GO

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After generating the error, if you inspect the SQL Server error log, you ll find something similar to listing 8.

if the button returned of the result is "Play the Next Version" then next track else return end if end repeat on error number -128 playpause end try end tell