This page is merely meant as a list for myself from handy mos-notes.
From time to time, I remember “I once read a mos-note” and I know that I can flag them in mos as well, but it’s just usefull to have it at one place which i can search quickly.

• Oracle Exadata Database Machine Setup/Configuration Best Practices (Doc ID 1274318.1)
  Exadata Best practices
• Quick Reference to Patch Numbers for Database/GI PSU, SPU(CPU), Bundle Patches and Patchsets (Doc ID 1454618.1)
  A usefull overview of cpu/psu patches
• How to upgrade RMAN catalog SCHEMA from 11g to 12.1.0.2 without upgrading the catalog database (Doc ID 1970049.1)
  To host a 12c rman catalog in a non-12c rman catalog database.
• Exadata Database Machine and Exadata Storage Server Supported Versions (Doc ID 888828.1)
  Exadata bible note
• Exadata Write-Back Flash Cache – FAQ (Doc ID 1500257.1)
  How to enable write back flash cache on the Exadata
• Mount Options for Oracle files for RAC databases and Clusterware when used with NFS on NAS devices (Doc ID 359515.1)
  The nfs mount options which you need to use.
• How to Setup and Run a Database Testing Replay in an Oracle Multitenant Environment (Real Application Testing – RAT) (Doc ID 1937920.1)
  How rat-tests can be performed in a Multitenant environment.
• How to resize ASM disks in Exadata (Doc ID 1684112.1)
  Simple howto on resizing asm disk groups on exadata
• Script to Collect Exadata Cell Performance Information (cellperfdiag.sql) (Doc ID 2038493.1)
  usefull script to see if and what’s going on on exadata cells
• Performance slower in OVM when compared with Baremetal (Doc ID 2080843.1)
  On OVM on exadata (X5-2 confirmed) query might be slower than on bare metal.
• Elastic Configuration on Exadata (Doc ID 1953915.1)
  How to apply an elastic configuration / expansion on an exadata (> X5)
• How to research Common Vulnerabilities and Exposures (CVE) for Exadata packages (Doc ID 2256887.1)
  Thanks to Philippe Fierens (@pfierens ) for pointing me to this one. It show how you can check for CVE exploits. 
• Rman leaves modified auxiliary spfile parameters if DUPLICATE fails (Doc ID 1283344.1)
  If duplicating or cloning with an 11.2.0.2 client you might hit this bug if the duplicate is interrupted