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(c) a pure capacitance (d) an inductance combined with a capacitance 8 The complex impedance value 0 j22 represents (a) a pure resistance (b) a pure inductance (c) a pure capacitance (d) an inductance combined with a resistance 9 What is the absolute-value impedance of 30 j 60 (a) Z = 90 (b) Z = 30 (c) Z = 45 (d) Z = 67 10 What is the absolute-value impedance of 50 j235 (a) Z = 240 (b) Z = 58,000 (c) Z = 285 (d) Z = 185 11 If the center conductor of a coaxial cable is made to have a smaller diameter, all other things being equal, what will happen to the Zo of the transmission line (a) It will increase (b) It will decrease (c) It will not change (d) There is no way to determine this without knowing the actual dimensions 12 If a device is said to have an impedance of Z = 100 , you can reasonably expect that this indicates (a) R + jX = 100 + j0 (b) R + jX = 0 + j100 (c) R + jX = 100 + j100 (d) the reactance and the resistance add up to 100 13 Suppose a capacitor has a value of 0050 F at 665 kHz What is the capacitive susceptance, stated as an imaginary number (a) BC = j479 (b) BC = j479 (c) BC = j0209 (d) BC = j 0209

Use SQL Command or SQL Command from Variable when setting the data access mode property of an OLE DB Source component and your source is a SQL Server database. This will execute the procedure sp_executesql. If you use a data access mode of Table or View or Table Name or View Name from Variable, SSIS will use the OPENROWSET() method to generate your results. Only select the columns you need in your data flow. This serves two purposes: it limits the amount of memory SSIS requires to store the data in its buffers, and it potentially buffers the source extract from source metadata changes. If you were to issue SELECT * FROM myTable instead, any column data type changes, additions, or removals can cause SSIS to fail validation and cause the package execution to fail. Add a WHERE clause to your source extract query to filter rows, returning only those rows that are required for processing. Of course, this only works if you are working with a source that s queryable (such as SQL Server, Oracle, DB2, and Teradata) and not a flat file or other non-database source. Large sorts should be done in the source extract query if possible. This will cause the sort to run on the server and prevent SSIS from having to buffer all of the data to sort it, which on large datasets could result in swapping out to disk.

activate activate object workbook "Widget Outputxls"

Transforming data is an extremely broad topic with a growing list of third-party components; I ll only cover some of the general guidelines that should work across most transformation scenarios. The first thing I recommend is building your transformations to perform all of the work you need to accomplish. Then, instead of adding a destination component, add a Row Count or a Copy Column transformation to assess the slowdown of your transformations, much like I demonstrated in the previous section. If your numbers are similar to your source acquisition baseline, you likely will not gain much by way of tuning your transformations. But if your numbers are much slower than your source acquisition baseline, you know you may have room for improvement. To ensure your transformations have the best performance, some of the things to consider are Avoid unnecessary data type casting. If possible, cast to an appropriate data type in your source query. Some components such as Aggregate and Sort require that they receive all input rows before they can begin processing the rows. These are known as asynchronous components, and will block the flow of data to downstream components. You may want to consider implementing this logic in the source query if possible. If you are using a single Aggregate transformation with multiple outputs and those outputs are going to separate destinations, consider creating an aggregate for each destination. This will ensure that each aggregate will not have to wait on the lowest-granular aggregation to process, as is the case when using a single Aggregate transformation with multiple outputs.