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Fuses A fuse is a piece of soft wire that melts, breaking a circuit if the current exceeds a certain level A fuse is placed in series with the transformer primary, as shown in Fig 21-11 A short circuit or overload anywhere in the power supply, or in equipment connected to it, will burn the fuse out If a fuse blows out, it must be replaced with another of the same rating Fuses are rated in amperes (A) Thus, a 5-A fuse will carry up to 5 A before blowing out, and a 20-A fuse will carry up to 20 A Fuses are available in two types: the quick-break fuse and the slow-blow fuse A quick-break fuse is a straight length of wire or a metal strip A slow-blow fuse usually has a spring inside along with the wire or strip It s best to replace blown-out fuses with new ones of the same type Quick-break fuses in slow-blow situations can burn out needlessly, causing inconvenience Slow-blow fuses in quick-break environments might not provide adequate protection to the equipment, letting excessive current flow for too long before blowing out Circuit Breakers A circuit breaker performs the same function as a fuse, except that a breaker can be reset by turning off the power supply, waiting a moment, and then pressing a button or flipping a switch Some breakers reset automatically when the equipment has been shut off for a certain length of time Circuit breakers are rated in amperes, just like fuses If a fuse or breaker keeps blowing out or tripping, or if it blows or trips immediately after it has been replaced or reset, then something is wrong with the power supply or with the equipment connected to it Burned-out diodes, a bad transformer, and shorted filter capacitors in the supply can all cause this trouble A short circuit in the equipment connected to the supply, or the connection of a device in the wrong direction (polarity), can cause repeated fuse blowing or circuitbreaker tripping Never replace a fuse or breaker with a larger-capacity unit to overcome the inconvenience of repeated fuse/breaker blowing/tripping Find the cause of the trouble, and repair the equipment as needed The penny in the fuse box scheme can endanger equipment and personnel, and it increases the risk of fire in the event of a short circuit The Complete System Figure 21-12 is a block diagram of a complete power supply Note the sequence in which the portions of the system, called stages, are connected A final note of warning is in order here:.

You can use these operators with either integer numbers or real numbers The type of result depends on the numbers you use For example, if you multiply two integers, you get an integer; but if you multiply an integer by a real number, or a real number by another real number, you get a real number If necessary, you can coerce the result of a calculation to another data type, as discussed next

Probably the most useful scenario based on tracking deprecated features is to collect data and save it on a data store, and then build a report over the data store and optionally include the report in SQL Server Management Studio. The frequency of collection, the synchronous or asynchronous mode of collection, and the data store used are a matter of choice (personally I prefer using Extended Events). Some of the possible tracking methods follow: Performance Monitor Can be used to display graphically the values of counters for the SQLServer:Deprecated Features performance object. The sys.dm_os_performance_counters Dynamic Management View Based on the same SQLServer:Deprecated Features performance object, it allows taking snapshots for the current values of the counters. The performance logs and alerts Use the same object as for Performance Monitor; the difference is that the values can be tracked over time. SQL Profiler and SQL Trace This method is based on the Deprecation Announcement and the Deprecation Final Support event classes.

Event notifications This method consists of creating an event notification for the DEPRECATION_ANNOUNCEMENT and DEPRECATION_FINAL_SUPPORT events. A stored procedure can be used to log the events. Extended Events The sqlserver.deprecation_announcement and the sqlserver.deprecation_final_support events support this method. An example is provided later on. SQL Trace Collector If you need automation for collecting deprecation events, the SQL Trace Collector part of the Data Collector architecture can be helpful. WMI This method consists of creating SQL Agent alerts based on WMI queries. It s mentioned only as a possible option, not as a suggestion, because it doesn t bring any advantages over the other methods. The next section highlights two of the mentioned methods. First, a simple skeleton for the event notifications method is displayed in listing 2.

You can easily coerce a number to the other type real number to integer number, or vice versa or to a list or a string To coerce a real number to an integer number in effect, rounding it to the nearest number use as integer For example, 15 as integer returns 2 To coerce an integer number to a real number, use as real AppleScript adds a decimal point and a 0 to the end of the integer number to create the real number For example, 100 as real returns 1000 To coerce an integer number or real number to a string, use as string The string contains the same number as the integer number or real number used For example, 254 as string returns "254"; 255693 as string returns "255693" To coerce an integer number or real number to a list, use as list The result is a singleitem list For example, 189 as list returns the list {189}

Problem 16-8 Suppose a resistor, a coil, and a capacitor are connected in series The resistance is 500 , the inductance is 100 H, and the capacitance is 1000 pF The frequency is 1592 kHz What is the complex impedance of this series RLC circuit at this frequency First, calculate XL = 628f L Convert the frequency to megahertz; 1592 kHz = 1592 MHz Then:

-- Create a queue CREATE QUEUE DeprecationFeatures_Queue; GO -- Create a service CREATE SERVICE DeprecationFeatures_Service ON QUEUE DeprecationFeatures_Queue([http://schemas.microsoft.com/SQL/ Notifications/P ostEventNotification]); GO -- Create a route CREATE ROUTE DeprecationFeatures_Route WITH SERVICE_NAME = N'DeprecationFeatures_Service', ADDRESS = N'LOCAL'; GO -- Create the actual event notification CREATE EVENT NOTIFICATION DeprecationFeatures_Notification ON SERVER FOR DEPRECATION_ANNOUNCEMENT, DEPRECATION_FINAL_SUPPORT TO SERVICE 'DeprecationFeatures_Service', 'current database'; GO

boolean You can coerce a boolean value to an integer number by using as integer The result is 1 for true or 0 for false

For using Extended Events, listing 3 creates a session and then adds the two deprecation events. For storage, a ring buffer with maximum 1000 entries is used.