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The Large Pool and the Java Pool
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The large pool is a purely optional memory pool, and Oracle manages it quite differently from the shared pool. Oracle uses the large pool mostly for accommodating Recovery Manager (RMAN) operations. You set the size of this pool in the initialization file by using the LARGE_POOL_SIZE parameter. The large pool memory component is important if you re using the shared server architecture. The Java pool (set by using the JAVA_POOL_SIZE parameter) is designed for databases that contain a lot of Java code, so that the regular SGA doesn t have to be allocated to components using Java-based objects. Java pool memory is reserved for the Java Virtual Machine (JVM) and for your Java-based applications. The default size for this memory pool is 20MB, but if you re deploying Enterprise JavaBeans or using CORBA, you could potentially need a Java pool size greater than 1GB.
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The Streams Pool
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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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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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Automatic Shared Memory Management
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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. The total size of the SGA will be the sum of the memory allocated to the auto-tuned SGA parameters, memory allocated to the manual SGA parameters, and fixed SGA and internal allocations.
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