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PART III
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OCA/OCP Oracle Database 11g All-in-One Exam Guide
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The Automatic Memory Management mechanism lets the Oracle instance manage server memory usage as a whole, by setting one parameter: MEMORY_TARGET This takes the automatic PGA management (enabled with PGA_AGGREGATE_TARGET) and the automatic shared memory management (enabled with SGA_TARGET) a step further, by letting Oracle transfer memory between PGAs and SGA on demand TIP To enable automatic memory management, set the one parameter MEMORY_TARGET, and do not set any of the other parameters listed previously, with the exception of LOG_BUFFER though this too can often be left on default Automatic memory management is not just a tool to make database administration easy It will often give big performance benefits as well Many databases will experience different patterns of activity at different times, which could benefit from different memory configurations For example, it is not uncommon for a database used for order processing to experience a very light transaction processing workload during most of the month, and then a heavy query processing workload during month-end reporting runs Transaction processing will typically not be demanding on PGA memory but will require a large database buffer cache Query processing will often require large PGA allocations, but not much buffer cache EXAM TIP The MEMORY_TARGET parameter is dynamic it can be adjusted without shutting down the instance but only within a limit set by another parameter: MEMORY_MAX_TARGET This is static, so it can only be raised by adjusting with the SCOPE=SPFILE clause and restarting the instance Manually transferring memory between SGA and PGA in response to changing patterns of activity is not a practical option, and many systems will not be able to allocate enough memory to both concurrently to satisfy their peak demands Automatic memory management is able to transfer memory between SGA and PGA as necessary to optimize performance within an overall memory constraint This overall constraint must be determined by the DBA and the system administrator together There is little point in the DBA setting an upper limit that is so large that the operating system has to page SGA and PGA to a swap device; the system administrator will be able to advise on a suitable maximum value EXAM TIP If you set the parameter PGA_AGGREGATE_TARGET or SGA_ TARGET when AMM is enabled, the values you specify will be a minimum size beneath which AMM will never reduce the PGA or SGA Exercise 25-1: Set the Memory Management Parameters In this exercise, you will disable Automatic Memory Management (if it is enabled) and set the SGA and PGA targets independently Make all the changes using syntax that will
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25: Performance Tuning
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only affect the running instance: do not propagate the changes to the spfile, unless you are prepared to reverse them later 1 Connect to your database with SQL*Plus as user SYSTEM 2 Ensure that none of the parameters for managing the dynamic SGA memory structures manually are set:
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alter alter alter alter system system system system set set set set db_cache_size=0 scope=memory; shared_pool_size=0 scope=memory; large_pool_size=0 scope=memory; java_pool_size=0 scope=memory;
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3 Disable Automatic Memory Management:
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alter system set memory_target=0 scope=memory;
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4 Set the parameters to size PGA and SGA independently, using the lowest permitted values:
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alter system set pga_aggregate_target=10m scope=memory; alter system set sga_target=64m scope=memory;
PART III
The second command may take a few minutes to complete, and it may fail if Oracle cannot reduce the SGA to the requested value 5 Determine the actual size of the currently allocated PGAs, by summing up the value for the statistic session pga memory across all sessions:
select sum(value) from v$sesstat natural join v$statname where name='session pga memory';
The figure will be significantly in excess of the 10MB requested in Step 4 This is because 10MB is a value that is so low that Oracle cannot keep to it The PGA target is only a target, not a hard limit 6 Determine the actual size of the SGA:
select sum(bytes) from v$sgastat;
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