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he proc file system is found on many UNIX and Linux variants and gives a virtual view into the running system Traditionally the proc file system is attached to the /proc mount point, but proc is not really a file system and mostly contains files of zero size Even though these objects look as if they are empty when they are listed, they actually contain quite a lot of information about the running system When viewed, they show system information from the kernel s perspective: their contents are based on system resources and characteristics, such as memory, CPU, kernel, and network utilization There are several kinds of files in the /proc directory tree on a Linux machine The first type is a series of directories that have numbers as names, each containing a group of files that hold specific information about the running system.

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Here s an example of a simple PL/SQL code block: SQL> DECLARE isbn NUMBER(9) BEGIN isbn := 123456789; insert into book values (isbn, 'databases', 59.99); COMMIT; END; SQL>

You can declare both variables and constants in the DECLARE section. Before you can use any variable, you must first declare it. A PL/SQL variable can be a built-in type such as DATE, NUMBER, VARCHAR2, or CHAR, or it can be a composite type such as VARRAY. In addition, PL/SQL uses the BINARY_INTEGER and BOOLEAN data types. Here are some common PL/SQL variable declarations: hired_date emp_name DATE; VARCHAR2(30);

Can the compilation model be used for extending existing projects with .NET features Can the assembly export functions to native clients Can the compilation model be used for wrapping native libraries

In addition to declaring variables, you can also declare constants, as shown in the following example: tax_rate constant number := 0.08;

You can also use the %TYPE attribute to declare a variable that is of the same type as a specified table s column, as shown here: emp_num employee.emp_id%TYPE;

Each numbered directory corresponds to a running process ID The files in these directories relate to the command that was invoked, the execution environment, parameters passed to the command, memory usage, and other valuable pieces of process information The other file types and directories found in /proc contain items such as current resource usage, system settings, hardware information, and network usage The man page for proc contains far more detail than this chapter, but please note that implementations of the proc file system on different operating systems are by no means identical I have worked on older versions of Solaris whose /proc contained only numbered directories for running processes, and those directories held files that were different from their Linux counterparts With this state of affairs, you are certain to profit from exploring the documentation for your specific system.

The %ROWTYPE attribute specifies that the record (row) is of the same data type as a database table. In the following example, the DeptRecord record has all the columns contained in the department table, with identical data types and length: declare v_DeptRecord department%ROWTYPE;

After the BEGIN statement, you can enter all your SQL statements. These look just like your regular SQL statements, but notice the difference in how you handle a SELECT statement and an INSERT statement in the following sections.

When you use a SELECT statement in PL/SQL, you need to store the retrieved values in variables, as shown here: DECLARE name VARCHAR2(30); BEGIN SELECT employee_name INTO name FROM employees WHERE emp_id=99999; END; /

Any INSERT, DELETE, or UPDATE statements in PL/SQL work just as they do in regular SQL. You can use the COMMIT statement after any such operation, as shown here: BEGIN DELETE FROM employee WHERE emp_id = 99999; COMMIT; END; /

The script we are about to explore has its origins in a utility that creates a brief system-status report The script returned a single line of key performance indicators; the information was derived from files located in /proc directories It displayed all the process-performance values for each system being monitored on a few lines all contained in a single window, using colors to indicate load level, memory, and swap usage (green for normal usage and red for high) The main purpose of this tool was to permit a quick visual check of whether certain machines were overloaded Our code extends the functionality of the original script from providing just one line of output per system to displaying a more comprehensive report about the processes running on a single machine The code itself is not very complex but it does demonstrate some of the /proc system usage data.

No Yes, but it can be a lot of work and makes sense only if the assembly is executed in a restricted CAS environment

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