[xarope]

Right, OLTP vs OLAP are very different workloads (using the car analogy, that would be like using a ferrari to tow a trailer, and an F250 to... oh wait, an F250 can do anything!).

But seriously though, even if you use postgres, as a former DBA (DB2 and Oracle) I would have tuned the OLTP database very differently to the OLAP database, and I don't mean just indexes, but even during ETL from OLTP->OLAP you might decide to de-normalize columns on the OLAP side simply to speed up queries (OLAP databases are the sort of database you were warned about, where indexes can be 10x the data size)