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When using shared resource (SR) signals, the sender writes data to a resource shared with the receiver. The receiver independently reads data from this resource, which can be a file, shared memory, a network connection, a pipe, or an interprocess control structure. With shared-resource delivery, only data (and not execution control) is transferred from the sender to the receiver. Although the sender can send any number of variables to the receiver, returned values are not possible. In a send interaction, the sender writes data to the resource. The receiver reads data from the resource. The signal s arrow on the diagram denotes the direction of data flow. When it is important to indicate that a signal is an SR signal, you can put the signal name in parentheses. Figure 7-7 shows an SR signal.

The CLIENT_RESULT_CACHE_LAG initialization parameter specifies the maximum time that can elapse before the OCI client query makes another round-trip to retrieve database changes pertaining to queries cached on the client. The range of values is 0 to a system-dependent maximum value. Example: CLIENT_RESULT_CACHE_LAG = 10000 Default value: 5000 (seconds) Parameter type: Static

The CLIENT_RESULT_CACHE_SIZE parameter specifies the maximum memory allocated to the client per process result set cache (in bytes). You must set a nonzero value for this parameter to enable the client query cache feature. You can override this parameter by setting the client configuration parameter OCI_RESULT_CACHE_MAX_SIZE. The range of values is 0 to an operating system dependent value. Example: CLIENT_RESULT_CACHE_SIZE = 50M Default value: 0 Parameter type: Static

The CONTROL_MANAGEMENT_PACK_ACCESS parameter specifies which of the two Server Manageability Packs should be active in the database. You can use the following two packs: Diagnostic pack: Includes AWR, ADDM, and so on Tuning pack: Includes the SQL Tuning Advisor, SQL Access Advisor, and so on You ll need a separate license for the diagnostic pack in order to enable the tuning pack. Possible values are diagnostic, none, and diagnostic+tuning. Example: CONTROL_MANAGEMENT_PACK=diagnostic Default value: diagnostic+tuning Parameter type: Dynamic. Modifiable with the ALTER SYSTEM statement

(EmployeeInfo)

The shared pool can normally take care of the memory needs of shared servers as well as Oracle backup and restore operations, and a few other operations. Sometimes, though, this may place a heavy burden on the shared pool, causing a lot of fragmentation and the premature aging-out of important objects from the shared pool due to lack of space. To avoid these problems, you can use the LARGE_POOL_SIZE parameter to mostly free up the shared pool for caching SQL queries and data dictionary information. If the PARALLEL_AUTOMATIC _TUNING parameter is set, the large pool is also used for parallel-execution message buffers. The amount of memory required for the large pool in this case depends on the number of parallel threads per CPU and the number of CPUs. Example: LARGE_POOL_SIZE=800M Default value: 0 (if the pool is not required for parallel execution and DBWR_IO_SLAVES is not set) Parameter type: Dynamic. The ALTER SYSTEM command can be used to modify this parameter.

Oracle gives you the option of archiving your filled redo logs. When you configure your database to archive its redo logs, the database is said to be in an archivelog mode. You should always archivelog your production databases unless there are exceptional reasons for not doing so. If you decide to archive the redo logs, you have to specify that in the initialization file using the three parameters described next.

The LOG_ARCHIVE_DEST_n parameters (where n = 1, 2, 3, . . . 10) define up to ten archivelog destinations. This parameter enables you to specify the location (or locations) of the archived logs. You should set this parameter only if you are running the database in archivelog mode. You can set the database to run in archivelog mode when you create the database by specifying the ARCHIVELOG keyword in your CREATE DATABASE statement. This is how you specify the LOG_ARCHIVE_DEST_n parameter (n=1): Example: LOG_ARCHIVE_DEST_1='LOCATION=/u02/app/oracle/arch/' Default value: None Parameter type: Dynamic. You can use the ALTER SESSION or the ALTER SYSTEM command to make changes.

When it is important to indicate the provenance of an SR signal, the signal name can be qualified in the usual ways (using the sender s name or ID), but it can also be qualified with the sender s DNS name, network address, computer name, or process name, as shown in Figures 7-8 through 7-11.

The LOG_ARCHIVE_FORMAT parameter specifies the default filename format for the archived redo log files. In this example, %t stands for the thread number, %s for the log sequence number, and %r for the resetlog s ID that ensures a unique name for archived redo logs across multiple incarnations of the database (the multiple incarnations are created after using a resetlogs operation). Example: LOG_ARCHIVE_FORMAT = 'log%t_%s_%r.arc' Default value: Operating-system dependent Parameter type: Static