Answer / sivaprasad

whn we r updating the record we provide lock for no one use at that time...........
we hav 2 types of locks
.....>exclusive lock & shared lock
to unlock
use relrsc(reclime resourse)

Answer / shishir

suppose we want to make any update on particular file A and during my process one more guy doing another updation on that file A ....so what happen that who ever make the last updation and compile the file will take place ....so what we do we hold that particular object and lock it ....so during the time when we are using that file no one will access that file ........ok ....and updation will take place step by step

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