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For all subfunctions of the fcntl function, the return value is slightly different in Perl from that returned by the operating system A value of -1 from the operating system is returned as undef by Perl, while a value of 0 from the system is returned by Perl as 0 but true This equates to true in a test condition, but 0 when evaluated as a number For all other values the return values are the same for the operating system and Perl Since the fcntl functions are operating system specific, no details will be given on the fcntl function at this stage, but see Table 7-8 for some sample functions and Table 7-9 for a description of many of the constants you will need You ll need to refer to your operating system documentation for details on the fcntl() functions supported on your system, or examine the Fcntl module, which will contain a summarized list of the functions as a list of constants for use when using the command We will be using some of the functions later in this chapter and elsewhere in the book If your system does not support fcntl(), a fatal error will occur

In this chapter you will learn to 05251 Configure and Manage the Oracle Network 05252 Use the Oracle Shared Server Architecture

Duplicates the supplied file descriptor, returning the lowest numbered file descriptor not currently in use This is roughly equivalent to the >&FH format with the Perl open function Returns the FD_CLOEXEC flag (see the next table) for the specified filehandle Sets the state of the FD_CLOEXEC flag on the filehandle

&F_GETFD &F_SETFD Table 7-8

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Networking is an integral part of the client-server database architecture that is fundamental to all modern relational databases The Oracle database had the potential for client-server computing from the beginning (version 1, released in 1978, made a separation between the Oracle code and the user code), but it was only with version 4 in 1984 that Oracle introduced interoperability between PC and server True client-server support came with version 5, in 1986 This chapter introduces the Oracle Net services Oracle Net was previously known as Sqlnet, and you will still hear many DBAs refer to it as such The default Oracle Net configuration is dedicated server In a dedicated server environment, each user process is connected to its own server process An alternative is shared server, where a number of user processes make use of a pool of server processes that are shared by all the sessions Generally speaking, DBAs have been reluctant to use shared server, but there are indications that Oracle Corporation would like more sites to move to it, and certainly knowledge of the shared server architecture is vital for the OCP examination

The following guidelines are useful to programmers who are writing libraries that will be used by others.

Gets the current flags for the specified filehandle These flags are identical to those you can specify during a sysopen function (see Table 7-9 for more information) Sets the flags for the specified filehandle (see Table 7-9 for suitable values) Gets the lock status for a specified filehandle; used to test whether a particular lock can be set on a file (see File Locking later in the chapter) Sets or clears a file segment lock (see File Locking ) Identical to F_SETLK, except that the process will block until a read or write lock can be set on the specified filehandle (see File Locking )

Oracle Net is the enabling technology for Oracle s client-server architecture It is the mechanism for establishing sessions against a database instance There are several tools that can be used for setting up and administering Oracle Net, though it can be done with nothing more than a text editor Whatever tool is used, the end result is a set of files that control a process (the database listener, which launches server processes in response to connection requests) and that define the means by which a user process will locate the listener

Table 7-8

Example Functions for fcntl (continued)

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