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13 D The only time a listener is required is if the DBCA is used, and Database Control is selected The DBCA will not continue if it cannot detect a listener A, B, and C A is wrong because there is a circumstance where a listener is required; B is wrong because in all other circumstances a listener is not required C is wrong because it does not go far enough: The DBCA will not require a listener, if Database Control is not selected 14 A This is the correct sequence (though 2 and 3 could be done the other way round) B, C, and D None of these are possible 15 D This is the one parameter that can never be changed after creation A, B, and C A and B are wrong because DB_BLOCK_SIZE cannot be changed no matter when you try to do it C is wrong because the CONTROL_ FILES parameter can certainly be changed, though this will require a shutdown and restart 16 A, C, F, and G All of these will always be created, by default if they are not specified B, D, and E B and D are wrong because these should exist before the instance is started E is wrong because the conversion of the static parameter file to a dynamic parameter file only occurs, optionally, after the database is created 17 D The database will function, but without the data dictionary views and PL/SQL packages created by these scripts it will be unusable A, B, C, and E A is wrong because the database will open; in fact, it must be open to run the scripts B is wrong because tables and other objects can certainly be created C is wrong because PL/SQL will be available; it is the supplied packages that will be missing E is completely irrelevant to these scripts 18 A The DBCA is the only tool that can manage templates B, C, D, and E These are all wrong because only the DBCA offers template management 19 C and E C is right because the character set can be set at creation time, no matter how the creation is done E is right because it is possible to change character sets after creation (though you don t want to do this unless it is really necessary) A, B, and D A and B are wrong because templates are not relevant If the template includes datafiles, the DBCA will change the character set behind the scenes D is wrong because the DBCA does not offer an option to do this 20 B Database Control can be used for each database and will be configured with a different port for each one A, C, and D A is wrong because this is what Grid Control can do C is wrong because Database Control must be installed in every database that will use it D is wrong because while a Database Control is only for one database, every database can have its own.

Note that in the preceding example I ve combined the open function with the die function to report an error if the open failed Nearly all functions within Perl return true (a value greater than zero) if the function was a success, so you can easily place it within a test or with the warn or die functions to report an errors see 9 for more information on error trapping in Perl So, in this example, if the open function returns true, then the die function will not be executed However, if it returns false (zero), indicating a failure, then the die function will be executed This is quicker and significantly more efficient than using if statements to test the success of functions This also demonstrates a basic principle of any programming: you must be able to track and trace errors Perl has a simple but effective method of error checking that we ll see in various examples throughout the rest of the book In this case, not being able to open a file is a serious problem, so there is little point in continuing One final item to mention for this example is that I ve left out the parentheses (which is valid in Perl; they are optional for all function arguments, but essential for other lists) and used or as the operator, which checks the function s success Using or is safe in a list context because it has a lower precedence than the list supplied to the open function If you wanted to use the || operator, you would have to enclose the open statement in parentheses; otherwise, the operator would act on the EXPR and die function:

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Some of the .NET languages don t support the conversion syntax, and calling conversion functions which have weird names may be difficult or impossible. To make classes easily usable from these languages, you should supply alternate versions of the conversions. If, for example, an object supports a conversion to a string, it should also support calling ToString() on that function. Here s how you d do it on the RomanNumeral class: using System; using System.Text; class RomanNumeral { public RomanNumeral(short value) { if (value > 5000) throw(new ArgumentOutOfRangeException()); this.value = value; }

open(DATA,"+>filetxt") || die "Couldn't open file filetxt, $!";

In this chapter you will learn to 05241 Set Database Initialization Parameters 05242 Describe the Stages of Database Startup and Shutdown 05243 Use Alert Log and Trace Files 05244 Use Data Dictionary and Dynamic Performance Views

In both of the previous cases, the file has been opened for updating, but the file pointer that describes the current position within the file is at the start of the file If you want to append, you can also use shell-style operators:

.

open(DATA, ">>filetxt");

7:

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