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Following making a tablespace read only, none of the objects within it can be changed with DML statements, as demonstrated in the figure But they can be dropped This is a little disconcerting but makes perfect sense when you think it through Dropping a table doesn t actually affect the table It is a transaction against the data dictionary, that deletes the rows that describe the table and its columns; the data dictionary is in the SYSTEM tablespace, and that is not read only Creating a table in a read-only tablespace also fails, since although it is a DDL statement, actual physical space for the initial extent of the table is required from the tablespace TIP Making a tablespace read only can have advantages for backup and restore operations Oracle will be aware that the tablespace contents cannot change, and that it may not therefore be necessary to back it up repeatedly

The translation replaces all occurrences of the characters in SEARCHLIST with the corresponding characters in REPLACEMENTLIST For example, using the The cat sat on the mat string we have been using in this chapter:

$string =~ tr/a/o/; print "$string\n";

A tablespace can be resized either by adding datafiles to it or by adjusting the size of the existing datafiles The datafiles can be resized upward automatically as necessary if

this script prints out The cot sot on the mot Standard Perl ranges can also be used, allowing you to specify ranges of characters either by letter or numerical value To change the case of the string, you might use

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In this example, reflection will open the names of all the assemblies on the command lines to search for the classes in them that implement a specific interface and then to create an instance of those classes and invoke a function on the instance. This is useful to provide a late-bound architecture, where a component can be integrated with other components runtimes. This example consists of four files. The first one defines the IProcess interface that will be searched for. The second and third files contain classes that implement this interface, and each is compiled to a separate assembly. The last file is the driver file; it opens the assemblies passed

the AUTOEXTEND syntax was used at file creation time Otherwise, you have to do it manually with an ALTER DATABASE command:

$string =~ tr/a-z/A-Z/;

in place of the uc function The tr operator only works on a scalar or single element of an array or hash; you cannot use it directly against an array or hash (see the discussion of grep or map in 7) You can also use tr// with any reference or function that can be assigned to For example, to convert the word cat from the string to uppercase, you could do this:

ALTER DATABASE DATAFILE filename RESIZE n[M|G|T];

8:

The M, G, or T refer to the units of size for the file: megabytes, gigabytes, or terabytes For example,

Unlike regular expressions, the SEARCHLIST and REPLACEMENTLIST arguments to the operator do not need to use the same delimiters As long as the SEARCHLIST is naturally paired with delimiters, such as parentheses or braces, the REPLACEMENTLIST can use its own pair This makes the conversion of forward slashes clearer than the traditional regular expression search:

CHAPTER 38 DEEPER INTO C#

$macdir = tr(/)/:/;

alter database datafile '/oradata/users02dbf' resize 10m;

The same feature can be used to make certain character sequences seem clearer, such as the following one, which converts an 8-bit string into a 7-bit string, albeit with some loss of information:

From the syntax, you do not know if the file is being made larger or smaller An upward resize can only succeed if there is enough space in the file system; a resize downward can only succeed if the space in the file that would be released is not already in use by extents allocated to a segment

tr [\200-\377] [\000-\177]

To add another datafile of size 50MB to a tablespace,

Three modifiers are supported by the tr operator, as seen in Table 8-5 The /c modifier changes the replacement text to be the characters not specified in SEARCHLIST You might use this to replace characters other than those specified in the SEARCHLIST with a null alternative; for example,

$string = 'the cat sat on the mat'; $string =~ tr/a-zA-Z/-/c; print "$string\n";

alter tablespace storedata add datafile ' C:\ORACLE\ORADATA\ORCL11G\STOREDATA_03DBF' size 50m;

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