— Checked for relevance on Januari 21, 2017
The Oracle Database version compatibility matrix and version support status matrix are almost mandatory when installing or upgrading clients or servers.
For information about patches, go here: Oracle database patches for Linux and Windows (on Metalink).
For announcements of security fixes, go to Critical Patch Updates, Security Alerts and Third Party Bulletin.
Oracle Database client / server version compatibility matrix
Oracle calls this Client / Server Interoperability Support, Note ID 207303.1
Oracle Database version release support status matrix
Oracle calls this the Database Releases Support Status Summary, Note ID 161818.1
You will be redirected to Oracle Support and you must be registered to gain access to the pages. I did not include the matrices, because these change over time.
Oracle Information about Windows 32 / 64 bit database and client versions
Certification Information for Oracle Database on Microsoft Windows x64 (64-bit), Doc ID 1307195.1