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xsoqsehift xssinfo ************ sum buffer_cache fixed_sga log_buffer ************ sum 863 rows selected.
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2404 5560 ---------159388244 92274688 1335924 6438912 ---------100049524
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The SGA is broken up into various pools. Here are the major ones you ll see: Java pool: The Java pool is a fixed amount of memory allocated for the JVM running in the database. In Oracle10g, the Java pool may be resized online while the database is up and running. Large pool: The large pool is used by shared server connections for session memory, by parallel execution features for message buffers, and by RMAN backup for disk I/O buffers. This pool is resizable online. Shared pool: The shared pool contains shared cursors, stored procedures, state objects, dictionary caches, and many dozens of other bits of data. This pool is resizable online in both Oracle 10g and 9i. Streams pool: This is a pool of memory used exclusively by Oracle Streams, a datasharing tool within the database. This pool is new in Oracle 10g and is resizable online. If the Streams pool is not configured and you use the Streams functionality, Oracle will use up to 10 percent of the shared pool for streams memory. The Null pool: This one doesn t really have a name. It is the memory dedicated to block buffers (cached database blocks), the redo log buffer, and a fixed SGA area.
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A typical SGA might look as shown in Figure 4-1.
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Figure 4-1. Typical SGA
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CHAPTER 4 MEMORY STRUCTURES
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The parameters that have the greatest effect on the overall size of the SGA are as follows: JAVA_POOL_SIZE: Controls the size of the Java pool. SHARED_POOL_SIZE: Controls the size of the shared pool (to some degree). LARGE_POOL_SIZE: Controls the size of the large pool. DB_*_CACHE_SIZE: Eight of these cache_size parameters control the sizes of the various buffer caches available. LOG_BUFFER: Controls the size of the redo buffer (to some degree). SGA_TARGET: Used with automatic SGA memory management in Oracle 10g and above. SGA_MAX_SIZE: Used to control the maximum size to which the SGA can be resized while the database is up and running. MEMORY_TARGET: Used with automatic memory management (both PGA and SGA automatic memory management). MEMORY_MAX_SIZE: Used to control the maximum amount of memory Oracle should strive to use over both the PGA and SGA sizes under automatic memory management. This is really just a target; the PGA may exceed the optimum size if the number of users increases beyond some level or a session(s) allocates large untunable bits of memory as demonstrated above.
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In Oracle9i, the various SGA components must be manually sized by the DBA. Starting in Oracle 10g and above, however, there is a new option to consider: automatic SGA memory management, whereby the database instance will allocate and reallocate the various SGA components at runtime in response to workload conditions. Moreover, starting in Oracle 11g, there s another new option: automatic memory management, whereby the database instance will not only perform automatic SGA memory management and automatic PGA memory management, it will also decide the optimum size of the SGA and PGA for you reallocating these allotments automatically when deemed reasonable. Using the automatic SGA memory management with Oracle 10g and above is simply a matter of setting the SGA_TARGET parameter to the desired SGA size, leaving out the other SGA-related parameters altogether. The database instance will take it from there, allocating memory to the various pools as needed and even taking memory away from one pool to give to another over time. When using automatic memory management with Oracle 11g and above, you simply set the MEMORY_TARGET. The database instance will then decide the optimal SGA size and PGA size and those components will be set up appropriately and do their own automatic memory management within their respective boundaries. Further, the database can and will resize the SGA and PGA allocations as the workload changes over time. Regardless of whether you are using automatic or manual memory management, you ll find that memory is allocated to the various pools in the SGA in units called granules. A single granule is an area of memory of 4MB, 8MB, or 16MB in size. The granule is the smallest unit of allocation, so if you ask for a Java pool of 5MB and your granule size is 4MB, Oracle will actually allocate 8MB to the Java pool (8 being the smallest number greater than or equal to 5 that is a multiple of the granule size of 4). The size of a granule is determined by the size of your SGA (this sounds recursive to a degree, as the size of the SGA is dependent on the granule size). You can view the granule sizes used for each pool by querying V$SGA_DYNAMIC_COMPONENTS. In fact, we can use this view to see how the total SGA size might affect the size of the granules:
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