Most results are for single server setup. The server is: two socket Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz; 128 GiB RAM; md RAID-5 on 8 6TB SATA HDD; ext4.
See as well hardware benchmark results page.
Some additional results (marked as x2, x3, x6) are for clustered setup for comparison. These results are contributed from independent teams and hardware specification may differ.
Disclaimer: some results are significantly outdated. Results for MonetDB was obtained at 2013 for version v11.15.11 (Feb2013-SP3). Results for MemSQL was obtained at 2015 for version 3.2. Results for Vertica are from 2015 for version 7.1.1.