more than 4 joined tables take too long to load

[abdelSajid]

Hello,

I am working on a projets where it is required of me to join 5 tables into 1 but the problem that it take way too long to the point of loading 30 lines/sec from a table that has around 2 millions, and through testing I found out that if , I take one of the table it start getting data faster at around 20k lines/sec and I am at a lost here, If anyone would have some insight as to why this problem is occurring I would be greatful. 

[amitchandak · Accepted solution]

@abdelSajid , can share the data model diagram.

Prefer to use star schema

https://www.youtube.com/watch?v=vZndrBBPiQc&feature=youtu.be

[abdelSajid]

Upon checking my data, I was using flat data, and that was a the problem, thank you