2
votes
2answers
61 views

Are indexes unnecessary for columnar database?

In a columnar database, are indexes unnecessary or useless?
0
votes
1answer
225 views

Storing 5TB web server access log vs OLAP DB

We have over 5TB compressed web server log in a HDFS and we often analyse using Hadoop. It is painful to run map reduce on 5TB of data and most importantly, not many developer are familiar with it. ...