Enable Automatic Memory Management (AMM)

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 26048M
memory_target                                         big integer 0
parallel_servers_target                              integer     2048
pga_aggregate_target                               big integer 6502M
sga_target                                                big integer 19520M

SQL> ALTER SYSTEM SET MEMORY_MAX_TARGET = 16384M scope=spfile ;

SQL > SHUTDOWN IMMEDIATE;
SQL > STARTUP ;
SQL> ALTER SYSTEM SET SGA_TARGET = 0 scope=spfile ;
System altered.
SQL> ALTER SYSTEM SET PGA_AGGREGATE_TARGET = 0 scope=spfile ;
System altered.
SQL> ALTER SYSTEM SET MEMORY_TARGET=12288M scope=spfile ;
System altered.
Thank you 
Osama Mustafa

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