---memory_target设置为非0时
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 800M
memory_target big integer 800M
parallel_servers_target integer 8
pga_aggregate_target big integer 600M
sga_target big integer 152M
SQL> alter system set pga_aggregate_target=100m scope=both;
System altered.
SQL> alter system set sga_target=100m scope=both;
System altered.
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 800M
memory_target big integer 800M
parallel_servers_target integer 8
pga_aggregate_target big integer 100M
sga_target big integer 100M
从spfile创建pfile，内容：
mbs.__db_cache_size=29360128
mbs.__java_pool_size=4194304
mbs.__large_pool_size=4194304
mbs.__oracle_base='/home/db/oracle'#ORACLE_BASE set from environment
mbs.__pga_aggregate_target=629145600
mbs.__sga_target=209715200
mbs.__shared_io_pool_size=0
mbs.__shared_pool_size=159383552
mbs.__streams_pool_size=4194304
---memory target 设置为0时
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 0
memory_target big integer 0
parallel_servers_target integer 8
pga_aggregate_target big integer 100M
sga_target big integer 152M
mbs.__db_cache_size=16777216
mbs.__java_pool_size=4194304
mbs.__large_pool_size=4194304
mbs.__oracle_base='/home/db/oracle'#ORACLE_BASE set from environment
mbs.__pga_aggregate_target=104857600
mbs.__sga_target=159383552
mbs.__shared_io_pool_size=0
mbs.__shared_pool_size=121634816
mbs.__streams_pool_size=4194304
结论：
memory_target设置为非0时，sga_target及pga_aggregate_target设置无效。
memory_target设置为0时，sga_target及pga_aggregate_target设置有效。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10972173/viewspace-748859/ ，如需转载，请注明出处，否则将追究法律责任。
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