Flipkart Interview Question SDE1s
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A columnar database is a database management system (DBMS) that stores data in columns instead of rows.
- deepak.shingan May 27, 2015Here is an example of a simple database table with 4 columns and 3 rows.
ID Last First Bonus
1 Doe John 8000
2 Smith Jane 4000
3 Beck Sam 1000
In a row-oriented database management system, the data would be stored like this: 1,Doe,John,8000;2,Smith,Jane,4000;3,Beck,Sam,1000;
In a column-oriented database management system, the data would be stored like this: 1,2,3;Doe,Smith,Beck;John,Jane,Sam;8000,4000,1000;
One of the main benefits of a columnar database is that data can be highly compressed. The compression permits columnar operations — like MIN, MAX, SUM, COUNT and AVG— to be performed very rapidly. Another benefit is that because a column-based DBMSs is self-indexing, it uses less disk space than a relational database management system (RDBMS) containing the same data.
And Why RedShift:
0. It's columnar database
1.Redshift can support petabyte databases.
2.It's Amazon Baby so all Amazon tools can easily integrated.
3.Multiple Data loading options.
4.Redshift uses DW2 dense compute nodes running on SSD. These are very fast solid state memory drives, and bring huge disk I/O benefits. Perfect for a data warehouse.
5. Support distkeys, sortkeys & compression.
6.