HBase is a sparse, distributed, persistent multidimensional sorted map. The map is indexed by a row key, column key, and a timestamp; each value in the map is an uninterpreted array of bytes. Applications store rows in labelled tables. A row has a sortable key and an arbitrary number of columns. All rows are sorted in strict alphabetical sequence.
norm noun [C]. âº an âaccepted âstandard or a way of being or doing things: Illness has âbecome the norm for her. (Definition of norm from the Cambridge Academic Content Dictionary Â© Cambridge University Press). See all translations.
Mandatory means you have to follow some rules , compulsory tends to have a feeling of something not yet being started or finished , so it 's compulsory that you must do something , because they are the rules , and also it 's one thing related to another , like if you 're 16 in a country where they have national service , it 's compulsory for you to ...