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The only interesting variables being set here are the debug flag and the variables storing the locations of the passwd and shadow files. The DEBUG variable just needs to be set to anything non-null to generate some debugging output while the script is running, so that you can see what it is doing when you are testing. The shad variable holds the location of the shadow file. Since the shadow file is a regular file that the system itself doesn t actually use, you can call it anything you want. The pswd file definition is the real master passwd file that the machine relies on. This script only ever has read access to that file, so there is no danger in possibly modifying the live file even when testing. If your anxiety level is high, you could copy the original and run the script against the copy.

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Oracle writes data in the program global area (PGA) in 64KB chunks. Therefore, Oracle advises you to create temporary tablespaces with extent sizes that are multiples of 64KB. For large data warehousing and decision-support system databases, which make extensive use of temporary tablespaces, the recommended extent size is 1MB.

As mentioned earlier, you must use the TEMPFILE clause when specifying the files that are part of any temporary tablespace. There is really no difference, as far as you are concerned, between a DATAFILE clause that you specify for permanent tablespaces and the TEMPFILE clause you specify for temporary tablespaces. However, Oracle distinguishes between the two types of files. Tempfiles have little or no redo data associated with them. You create a temporary tablespace the same way as you do a permanent tablespace, with the difference being that you specify the TEMPORARY clause in the CREATE TABLESPACE statement and substitute the TEMPFILE clause for the DATAFILE clause. Here s an example:

SQL> CREATE TEMPORARY TABLESPACE temp_demo TEMPFILE 'temp01.dbf' SIZE 500M AUTOEXTEND ON; In the preceding statement, the AUTOEXTEND ON clause will automatically extend the size of the temporary file, and thus the size of the temporary tablespace.

You use the TEMPFILE clause, not the DATAFILE clause, when you allocate space to a temporary tablespace.

In the following code we determine the number of days since 1/1/1970, the start of the UNIX epoch. The number in the third field of a shadow-file entry represents the date that the password for that account was last changed, expressed as a number of days since the beginning of the epoch. This value can be determined in a number of ways. Please refer to 3 for more discussion on this topic.

You may have multiple temporary tablespaces in an Oracle Database 10g database, in order to support heavy database sorting operations. You can view the amount of sort space usage in your database by using the V$SORT_SEGMENT and V$TEMPSEG_USAGE views. In order to drop a default temporary tablespace, you must first use the ALTER TABLESPACE command to create a new default tablespace for the database. You can then drop the previous default temporary tablespace like any other tablespace.

Oracle recommends that you use a locally managed temporary tablespace with a 1MB uniform extent size as your default temporary tablespace.

The instruction stind.i4 (store a 4-byte integer indirectly) allows managed code to operate on the virtual memory of the running process. Whenever a 4-byte integer value needs to be stored at an arbitrary address in virtual memory, this IL instruction is used. The next code sample combines a read and a write operation: void f(int* pi) { *pi += 42; } To map this C++ source code to IL, the C++/CLI compiler generates the following code: // *pi += 42; ldarg.0 dup ldind.i4 // // // // // // // // // // // // // // Push the first argument (pi) on the stack (it will be needed by the stind.i4 instruction at the end of this code sample) Push it again (it will also be needed by the following instruction) Consider the top of the stack to be a virtual address to a 4-byte integer. Replace the top of the stack with the value that the address refers to Push the 4-byte integer value 42 on the stack Consider the top two elements of the stack to be two 4-byte integer values. Replace these two elements with one element whose value is the sum. Store the value on the top of the stack at the address specified by the top - 1 stack element (which is the element pushed in the first instruction of this code sample)