Oracle database frequently prompts for 27102 out of memory solution

There are a lot of solutions on the net, but I do not understand, do not know what the ghost of the Thing, why a word can solve the matter, have to long-winded said the principle is what, see a face Meng Forced

My solution into the play

Vi/etc/sysctl.conf

Modify the value of Kernel.shmall (total shared memory), which is originally 2097152, I give it to 4097152 (temporarily do not know what value should be changed, but the value is changed to the right, I just do the first bit of 2 to 4, then the problem is automatically resolved), and then Sqlplus /As Sysdba

Executes select status from V$instance; no more prompt out of memory error, but normal display of open

Oracle database frequently prompts for 27102 out of memory solution