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A filehandle is a named internal Perl structure that associates a physical file with a name A filehandle can be reused It is not permanently attached to a single file, nor is it permanently related to a particular file name The name of the filehandle and the name of the file are not related As far as Perl is concerned, all operating systems support three basic filehandles STDIN, STDOUT, and STDERR The exact interpretation of the filehandle and the device or file it is associated with depend on the OS and the Perl implementation Table 7-1 shows the relationship between Perl filehandles and the underlying C file descriptors Perl also supports a number of standard filehandles that provide access to files while in special command line modes (see 15), and when accessing information appended to a Perl script See the end of 4 for a list of standard variables and filehandles All filehandles are capable of read/write access, so you can read from and update any file or device associated with a filehandle However, when you associate a filehandle, you can specify the mode in which the filehandle is opened This option prevents you from accidentally updating or overwriting information in a file that you only wanted to read You can see from Table 7-1 the access modes for the standard filehandles All filehandles are by default buffered on both input and output In most cases, this helps to improve performance by reading more than is needed from the physical device, or by block writing to a physical device Information is buffered on a block-by-block basis (the underlying OS defines the block size) The only exception to this rule is STDOUT, which is buffered on a line basis: appending the newline character to a printed string will automatically flush the buffer You can switch the buffering for the currently selected filehandle by setting the value of the $| variable to any value other.

TIP With the current release, some of these limits (such as the number of datafiles) are only soft limits, and therefore of little significance PART I

STDIN STDOUT STDERR Table 7-1

.

0 1 2

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Datafile specifications are provided for the SYSTEM, SYSAUX, and UNDO tablespaces Tempfile specifications for a TEMPORARY tablespace are also provided The database character set used for storing data dictionary data and table columns of type VARCHAR2, CHAR, and CLOB is specified followed by the national character set (which is used for columns of type NVARCHAR2, NCHAR, and NCLOB) It is possible to change the character set after creation with SQL*Plus Choice and use of character sets, and other aspects of globalization, are covered in detail in 26 TIP Until version 9i of the database, there was no supported means for changing the database character set after creation: it was therefore vital to get this right With 9i and later, it is possible to change it afterward, but this is not an operation to embark on lightly Get it right now! The logfile clause specifies three log file groups, each consisting of one member This is an example of the DBCA defaults perhaps not doing a perfect job It would be better practice to multiplex the redo log: to create at least two members for each group Not a problem this can be fixed later (in 14) The online redo log will always require substantial tuning; the defaults are applicable to virtually no production systems Finally, SYS and SYSTEM passwords are initialized, and spooling to the log is switched off This one file with the CREATE DATABASE command will create a database After its successful execution, you will have an instance running in memory, and a database consisting of a controlfile and copies as specified by the CONTROL_FILES initialization parameter, and the datafiles and redo logs specified in the CREATE DATABASE command A data dictionary will have been generated in the SYSTEM tablespace But although the database has been created, it is unusable The remaining scripts called by ocp11gsql make the database usable The CREATE DATABASE command has many options, all of which have defaults For example, if you do not specify a datafile for the SYSTEM or SYSAUX tablespace, one will be created anyway If you do not specify a character set, there is a default, which will depend on the operating system configuration (it may not be a very helpful default commonly, it is US7ASCII, which is inadequate for many applications) There are also defaults for the online redo logfiles There are no defaults for the TEMP and UNDO tablespaces; if these are not specified, the database will be created without them Not a problem they can be added later TIP The CREATE DATABASE command can be extremely long and complicated but there are defaults for everythingYou can create a database from a SQL*Plus prompt with two words: CREATE DATABASE.

than zero It s also possible to set the buffering on other files if you use the IO::Handle module with the autoflush method For example, the following code turns buffering off for the DOOR filehandle:

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