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ith security concerns reigning supreme, it is wise to keep a tight leash on your user accounts Unfortunately, it can be difficult to control password aging in an environment with many users It s definitely preferable to have user passwords set to expire automatically; however, if the account goes unused for a long period of time, even though the password on an account is expired the account will still be active In some instances an account can still be accessed without the password being updated Also, if a user logs in to their account infrequently, they may not know that their account is about to expire Even when a user does use her account regularly, the expiration warning message may go unnoticed among the other items that typically scroll across the screen in the message of the day.

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Oracle Streams is a technology for enabling data sharing among different databases and among different application environments. The Streams pool is the memory allocated to support Streams activity in your instance. If you manually set the Streams pool component by using the STREAMS_POOL_SIZE initialization parameter, memory for this pool is transferred from the buffer cache after the first use of Streams. If you use automatic shared memory management (discussed next), the memory for the Streams pool comes from the global SGA pool. The amount transferred is up to 10 percent of the shared pool size.

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In previous versions of Oracle, DBAs spent quite a bit of time pondering the sizing of the SGA It wasn t uncommon for them to recalibrate the SGA size quite often as part of their instance-tuning efforts In Oracle Database 10g, you can configure automatic shared memory management by using the new SGA_TARGET initialization parameter All you need to do is assign a certain value for the SGA_TARGET parameter, and Oracle will automatically manage the distribution of this memory among the various components of the SGA Oracle s allocation of the SGA memory to the various components isn t static, but changes with the changing workload of the database.

Oracle can automatically manage the following five components of the SGA (the relevant Oracle initialization parameter is in parentheses): Database buffer cache (DB_CACHE_SIZE) Shared pool (SHARED_POOL_SIZE) Large pool (LARGE_POOL_SIZE) Java pool (JAVA_POOL_SIZE) Streams pool (STREAMS_POOL_SIZE) As you can see, Oracle automatically tunes five components of the SGA, which are referred to as the automatically sized SGA parameters You must still manage the rest of the SGA components yourself, even under automatic shared memory management The following are the manually tunable components of the SGA: Keep buffer cache (DB_KEEP_CACHE_SIZE) Recycle buffer cache (DB_RECYCLE_CACHE_SIZE) Any nonstandard block size buffer caches (DB_nK_CACHE_SIZE) Redo log buffer (LOG_BUFFER) Note that the first three components in this list are optional As the DBA, you must set the value for each of the manual SGA components You can set up automatic shared memory management simply by setting the SGA_TARGET parameter to a positive value.

Once you do this, Oracle will automatically tune the five auto-tuned SGA parameters, but not all of the SGA_TARGET s total size can be taken by the auto-tuned parameters Oracle will first deduct the memory necessary for the manual SGA parameters from the SGA_TARGET size, and it will allocate the remainder for the auto-tuned parameters When you set the SGA_TARGET parameter to a positive value, the default value for the five auto-tuned SGA parameters will be zero, but if you set a specific value for any of the auto-tuned parameters, that value becomes the lower bound for that parameter If there isn t enough memory left in the SGA to satisfy any values you select for the auto-tuned parameters, Oracle will just reduce the lower bound of those parameters to fit within the available memory.