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Answer Posted / kushal samanta
Question :-> What is ACID property ?
Ans:->
ACID PROPOTIES;-
ACID STANDS FOR-
1)ATOMICITY
2)CONSISTENCY
3)ISOLATION
4)DURABILITY
BEFORE GOING TO ACID PROPOTIES WE MUST KNOW ABOUT
TRANSACTION-
A LOGICAL UNIT OF A WORK IS KNOWN AS TRANSACTION.
WHEN WE TRANSFER ANY DATA FROM ONE PLACE TO ANOTHER PLACE
AT A INTERMIDIATARY STATE IT MAY FAILUARE ,WHICH DATA WE
SEND THAT DATA MAY LOOSE FOR EVER.SO TO AVOID THAT PROBLEM
ACID PROPOTIES IS NEEDED,In computer science, ACID
(atomicity, consistency, isolation, durability) is a set of
properties that guarantee that database transactions are
processed reliably.
ATOMICITY-;IT MEANS ALL OR NOTHING,ALL THE TRANSACTION
PROCESSING MUST BE PERFORMED,OTHERWISE IT WILL NOT
PERFORM.NEVER IT STAY IN INTERMEDIATARY STATE.
CONSISTENCY;-IT MEANS A VALID DATA SHOULD INPUT,IF WE DONOT
INPUT PROPER INPUT THEN WE WILL FIND WRONG OUTPUT.
ISOLATION;- NO'S OF DEVICE WANT TO ACCESS ON SAME DATA,IT
IS IMPOSSIBLE TO ACCESS ON SAME DATA,BY ISOLATION0, IT
DECIDE WHICH DEVICE ACCESS THAT DATA,AT THAT TIME ANOTHER
DEVICES MUST STILL IN THEIR CRITICAL SECTION.
DURABILITY-;WHEN WE PROCESS SOMETHING ,IF THAT TIME POWER
FAILURE THEN ALL DATA WILL BE LOST,SO WE NEED TO RECOVER
THAT DATA.THERE IS TRANSACTION LOG TABLE WHICH DECIDES WHAT
TRANSACTION DONE ON WHICH DATA.OTHERWISE IT IS CALLED
RECOVERY OF DATABASE.
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