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The wait operation s test-and-decrement action is atomic, meaning that once it has started, it can t be interrupted. Being atomic (in other words, indivisible) guarantees that the decrement action occurs immediately after the test, before another process is allowed to run. Semaphores generally allow multiple processes to wait for signals, so semaphore implementation typically maintains a First In, First Out (FIFO) list of blocked processes. When the semaphore gets signaled, a process is removed from the list and allowed to resume execution.

The flash recovery area requires that you use OMF, which means you can t use the LOG_ARCHIVE_DEST and LOG_ARCHIVE_DUPLEX_DEST parameters to specify redo log archive destinations (if you use these, you can t enable the flash recovery area). Instead, you must use the newer LOG_ARCHIVE_DEST_n parameters. With OMF, Oracle designates the default location for the datafiles, control files, and redo log files based on the values of DB_CREATE_FILE_DEST and DB_CREATE_ONLINE_LOG_DEST_n. You use these two initialization parameters, along with DB_RECOVERY_FILE_DEST, which specifies the location of the flash recovery area.

The location specified with DB_RECOVERY_FILE_DEST should not be the same as DB_CREATE_FILE_ DEST or any setting in DB_CREATE_ONLINE_LOG_DEST_n.

Semaphores in the classic literature use Dijkstra s original notation. The signal operation is called V, from the Dutch word verhogen (to increment). The wait operation is called P, from the Dutch word proberen (to test).

Setting the CONTROL_FILES parameter before you start the instance and create a new database means that Oracle creates the control files in the locations that you specify. If you don t set the CONTROL_ FILES parameter during instance creation, Oracle creates the control files in default locations, following a set of rules: Specifying DB_CREATE_ONLINE_LOG_DEST_n gets Oracle to create an OMF-based control file in n number of locations. The first directory will hold the primary control file. If you specify the DB_CREATE_FILE_DEST and DB_RECOVERY_FILE_DEST parameters, Oracle will create an OMF-based control file in both of these locations. If you just specify DB_RECOVERY_FILE_DEST, Oracle creates an OMF-based control file only in the flash recovery area. If you omit all the initialization parameters, Oracle creates a non-OMF-based control file in the system-specific default location.

As I noted earlier, you can t use the LOG_ARCHIVE_DEST and LOG_ARCHIVE_DUPLEX_DEST parameters to specify redo log archive destinations. If you don t specify the LOGFILE clause when you create a database, Oracle creates the redo log files based on the following rules: If you specify the DB_CREATE_ONLINE_LOG_DEST_n parameter, Oracle creates an online redo log member in n number of locations. The maximum number is equal to the MAXLOGMEMBERS limit. If you specify the DB_CREATE_FILE_DEST and DB_RECOVERY_FILE_DEST parameters, Oracle creates an online redo log member in these locations. If you just specify the DB_RECOVERY_FILE_DEST parameter, Oracle will create an online redo log member in the flash recovery area only. Oracle will also implicitly set LOG_ARCHIVE_DEST_10 to the flash recovery area. If you omit all three initialization parameters, Oracle will create a non-OMF online redo log file in the system-specific default location.

Let s review the procedure for configuring the flash recovery area and look at an example of how to set up the flash recovery parameters in your initialization file This example assumes you are using OMF (see 17) OMF files are automatically named and managed by the Oracle database itself You just provide a directory for the files, and Oracle will take care of the rest When you use OMF files, you use two parameters to tell Oracle where to create your datafiles, online redo log files, and control files You use the DB_CREATE_FILE_DEST parameter to specify the location for all database files You use the DB_CREATE_ONLINE_LOG_DEST_n parameter to specify the location of all online redo log and control files If you don t specify the second parameter, Oracle will create all three types of files in the directory you specified for the DB_CREATE_FILE_DEST parameter.