#这个大小决定了memory_target的大小，必须大于memory_target

mount -o remount,size=50G /dev/shm



alter system set memory_max_target=48000M scope=spfile;



alter system set memory_target=48000M scope=spfile;



ALTER SYSTEM SET SGA_TARGET = 0 SCOPE=SPFILE;



ALTER SYSTEM SET PGA_AGGREGATE_TARGET = 0 SCOPE=SPFILE;



show parameter target;

参考：https://blog.csdn.net/sunny05296/article/details/56495599。