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Automatic SGA Memory Management
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Just as there are two ways to manage PGA memory, there are two ways to manage SGA memory starting in Oracle 10g and above: manually by setting all of the necessary pool and cache parameters, and automatically by setting just a few memory parameters and a single SGA_TARGET parameter. By setting the SGA_TARGET parameter, you are allowing the instance to size and resize various SGA components.
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Note In Oracle9i and before, only manual SGA memory management was available the parameter
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SGA_TARGET did not exist and the parameter SGA_MAX_SIZE was a limit, not a dynamic target.
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In Oracle 10g and above, memory-related parameters are classified into one of two areas: Auto-tuned SGA parameters: Currently these are db_cache_size, shared_pool_size, large_pool_size, and java_pool_size. Manual SGA parameters: These include log_buffer, streams_pool, db_Nk_cache_size, db_keep_cache_size, and db_recycle_cache_size.
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At any time in Oracle 10g and above, you may query V$SGAINFO to see which components of the SGA are resizable: ops$tkyte%ORA11GR2> select * from V$SGAINFO; NAME BYTES RES ---------------------------------------- ---------- --Fixed SGA Size 1335924 No Redo Buffers 2244608 No Buffer Cache Size 113246208 Yes Shared Pool Size 142606336 Yes Large Pool Size 4194304 Yes Java Pool Size 4194304 Yes Streams Pool Size 0 Yes Shared IO Pool Size 0 Yes Granule Size 4194304 No Maximum SGA Size 267825152 No Startup overhead in Shared Pool 109051904 No Free SGA Memory Available 0 12 rows selected.
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CHAPTER 4 MEMORY STRUCTURES
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Note To use automatic SGA memory management, the parameter statistics_level must be set to TYPICAL
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or ALL. If statistics collection is not enabled, the database will not have the historical information needed to make the necessary sizing decisions.
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Under automatic SGA memory management, the primary parameter for sizing the auto-tuned components is SGA_TARGET, which may be dynamically sized while the database is up and running, up to the setting of the SGA_MAX_SIZE parameter. This defaults to be equal to the SGA_TARGET, so if you plan on increasing the SGA_TARGET, you must have set the SGA_MAX_SIZE larger before starting the database instance. The database will use the SGA_TARGET value, minus the size of any of the other manually sized components such as the db_keep_cache_size, db_recycle_cache_size, and so on, and use that amount of memory to size the default buffer pool, shared pool, large pool, and Java pool. Dynamically at runtime, the instance will allocate and reallocate memory among those four memory areas as needed. Instead of returning an ORA-04031 "Unable to allocate N bytes of shared memory" error to a user when the shared pool runs out of memory, the instance could instead choose to shrink the buffer cache by some number of megabytes (a granule size) and increase the shared pool by that amount. Over time, as the memory needs of the instance are ascertained, the size of the various SGA components would become more or less fixed in size. The database also remembers the sizes of these four components across database startup and shutdown so that it doesn't have to start all over again figuring out the right size for your instance each time. It does this via four double-underscore parameters: __db_cache_size, __java_pool_size, __large_pool_size, and __shared_pool_size. During a normal or immediate shutdown, the database will record these values to the stored parameter file and use them at startup to set the default sizes of each area.
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Note This last feature, of storing the recommended values for the pools, only works if you are using stored
parameter files.
Additionally, if you know you want a certain minimum value to be used for one of the four areas, you may set that parameter in addition to setting the SGA_TARGET. The instance will use your setting as the lower bound, or the smallest size that particular area may be.
Automatic Memory Management
Starting in Oracle Database 11g Release 1 and above, the database also offers automatic memory management sort of a one stop shop for all of your memory settings. With Oracle 10g and automatic SGA memory management the DBA could get away with just two major memory settings the pga_aggregrate_target and the sga_target. The database would automatically allocate and reallocate memory chunks within each as described above. In Oracle Database 11g, the DBA can now get away with setting a single memory parameter the memory_target. This memory_target represents the total amount of memory the combined SGA and PGA allocations should strive to stay within (remember, the PGA memory can be somewhat uncontrollable!). The database will dynamically determine what the proper SGA size is and what the proper PGA size is, based on workload history). Over time, as the workload performed in the database changes, the allocations to the SGA and PGA will change as well. For example, if you are heavy OLTP (Online Transaction Processing) during the day and heavy batch
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