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This is especially useful if you want to save the information that would normally be printed to STDOUT and STDERR You duplicate the two standard filehandles to new filehandles You can then respecify the destination for STDOUT and STDERR, perhaps to an external log file This will force all output and errors to the new location, without losing the ability to report information to the real standard output and error using the duplicated filehandles For example:

The views can also be seen through Database Control From the database home page, take the Server tab and the Initialization Parameters link On the window following, shown in Figure 3-1, there are two subtabs: Current shows the values currently in effect in the running instance and may be obtained by querying the V$PARAMETER view, while the SPFile tab shows those values recorded in the spfile and may be obtained by querying the V$SPPARAMETER view The changeable parameters can be adjusted through the same window The values for the first four parameters shown (CLUSTER_DATABASE, COMPATIBLE, CONTROL_ FILES, and DB_BLOCK_SIZE) cannot be dynamically changed; they are static But the next parameter, DB_CREATE_FILE_DEST, can be dynamically changed In the figure, it has not been set but it can be, by entering a value in the box in the column headed Value To change the static parameters, it is necessary to navigate to the SPFile tab, and make the changes there To change a parameter from SQL*Plus, use the ALTER SYSTEM command Figure 3-2 shows several examples The first query in Figure 3-2 shows that the values for the parameter DB_CREATE_ FILE_DEST are the same in the running instance in memory, and in the spfile on disk The next two commands adjust the parameter in both places to different values, by using the SCOPE keyword The results are seen in the second query The final command uses SCOPE=BOTH to change both the running and the stored value with one command The BOTH option is the default, if the SCOPE keyword is not specified

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open(SECOUT,">&STDOUT"); open(SECERR,">&STDERR"); open(STDOUT,">stdlogtxt"); open(STDERR,">stderrtxt");

Figure 3-1

In the preceding example, all standard prints will go to the stdlogtxt file, while errors will go to stderrtxt If you needed to, however, you could still report to the real standard output and error by using the SECOUT and SECERR filehandles The penultimate form of the open function emulates the functionality of the fdopen system function It associates a filehandle with a specific file descriptor number For example, the following line opens STDIN by file descriptor:

To finish the section on user-defined conversions, a few details on how the compiler views conversions warrant a bit of explanation. Those who are really interested in the gory details can find them in the C# Language Reference.2 You can safely skip the following sections if you d like.

EXAM TIP An attempt to change a static parameter will fail unless the SCOPE is specified as SPFILE The default SCOPE is BOTH the running instance and the spfile If the instance is started with a pfile, then SCOPE=SPFILE will fail As was seen in 2, when a database instance is first created, it is built with a pfile This may be converted to an spfile using this command:

open(SECIN,"<&=1");

The final two formats are really extensions of the earlier pipe expressions Instead of starting a new program from the current script, an explicit fork is done, creating a new child process The return value of open is the process ID of the child The filehandle is normal as far as the parent is concerned However, the input and output to the parent filehandle is piped to the STDOUT or STDIN, respectively, of the child There is little advantage in this method of using a piped command, except that it can be useful in secure situations where you want to control the method used to execute the external command For example, the earlier gzcat example could be rewritten as

create spfile [='spfilename'] from pfile [='pfilename'];

open(GZDATA,"-|") or exec 'gzcat', 'filegz';

If names are not given for spfilename or pfilename, then the default names based on the ORACLE_HOME and the SID will be assumed To reverse-engineer an spfile into a pfile, the command is

open(EMAIL, "|-") or exec 'mail' 'mc@mcwordscom';

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