Hadoop comparison to RDBMS

Question

I really do not understand the actual reason behind hadoop scaling better than RDBMS . Can anyone please explain at a granular level ? Has this got something to do with unde

Answer 1

In RDBMS , data is structured , rather it is indexed. Retrieval of data of any particular 'nth' column is loading the entire database and then selecting the 'nth' column.

where as in Hadoop, say Hive, we load the only the particular column from the entire data set. More so over the data loading is also done by Map reduce programs which is done in a distributed structure which reduce the overall time.

Hence, two advantages of using Hadoop and its tools.