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Targets The event consumers. In the case of our example, we use the Event Bucketing Target, which retains data (the sql_text) for the sql_statement_ completed event. Actions Programmatic responses or a series of responses to an event (such as capturing the T-SQL stack collection or generating a user dump). For the previous example, the action is collecting the sql_text column for the sql_statement_completed event. Other possible actions include capturing a stack dump, aggregating event data, appending information to event data, or storing state information. Predicates Boolean expressions that filter the events. In our example, the sqlserver.database_id predicate filters the events that occurred in the database with the ID of 1 (the master database). Types Encapsulate the characteristics of collected data. For example, the type of the sqlserver.database_id predicate is pred_source. Maps Associate internal values to more meaningful descriptions. For example, the internal value 3 for lock_resource_type is mapped to the string FILE (which is self explanatory). The complete mappings can be obtained by running the following code: SELECT name, map_key, map_value FROM sys.dm_xe_map_values Sessions Contain targets and the enabled events. The next section of the chapter goes deeper in explaining the XEVENT elements.

Series Resonance Recall that capacitive reactance, XC, and inductive reactance, XL, can be equal in magnitude, although they are always opposite in effect In any circuit containing an inductance and capacitance, there exists a frequency at which XL = XC This condition constitutes resonance In a simple LC circuit, there is only one such frequency But in some circuits involving transmission lines or antennas,

Table 12-1 Properties of the track Object (continued)

If you need more details about the Extended Events architecture, this section is for you. I also encourage you to use Books Online for additional information.

The SQL Server Extended Events engine is a collection of services and objects that enables you to define events, process event data, and manage the XEVENT sessions, services, and objects. One characteristic that makes XEVENT a general event infrastructure is that the events engine is event-agnostic. The processes that use the engine define the interaction with the engine and supply event points and actions to take when an event fires. Thus any event can be bound to any target. Figure 1 represents the high-level architecture of the SQL Server Extended Events engine: The SQL Server Extended Events engine is integrated in the SQL Server database engine. A host process contains only one instance of the Extended Events engine. It handles session management, dispatching, and memory buffers for events. A session can contain enabled events, targets, and buffers. Instances of targets may be created and added to a session.

there can be many such frequencies The lowest frequency at which resonance occurs is called the resonant frequency, symbolized fo Refer to the schematic diagram of Fig 17-11 You should recognize this as a series RLC circuit At some particular frequency, XL = XC This is inevitable if L and C are finite and nonzero This frequency is fo for the circuit At fo, the effects of capacitive reactance and inductive reactance cancel out The result is that the circuit appears as a pure resistance, with a value that is theoretically equal to R If R = 0, that is, if the resistor is a short circuit, then the circuit is called a series LC circuit, and the impedance at resonance will be theoretically 0 + j 0 The circuit will offer no opposition to the flow of alternating current at the frequency fo This condition is series resonance In a practical series LC circuit, there is always a little bit of loss in the coil and capacitor, so the real part of the complex impedance is not exactly equal to 0 (although it can be extremely small)

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The memory buffers for the events are dispatched to targets when they re filled. Dispatchers are worker threads. Each Windows process can have one or more modules (a Win32 process or Win32 module). Each of the Windows process modules can contain one or more Extended Events packages, which contain one or more Extended Events objects (types, targets, actions, maps, predicates, and events).