Database hang or crash when mixed Exadata cell software versions are involved

(Doc ID 1608133.1)

Last updated on DECEMBER 23, 2013

Applies to:

Oracle Exadata Storage Server Software - Version 11.2.3.3.0 to 11.2.3.3.0 [Release 11.2]
Information in this document applies to any platform.

Symptoms

Temporarily running mixed Exadata Storage Server Software versions (e.g. during rolling cell patching or rack expansion with new hardware) on the storage cells is a common practice.  However, if some of the Storage Cells involved are running version 11.2.3.3.0, while the Compute Nodes are using Oracle Database software version 11.2.0.2 or 11.2.0.3 without patch 17854520 installed, the system is exposed to database hangs or crashes.

Database instances may crash with ORA-7445[OSSCAP_RECOMPUTE_MIN]

Changes

Some Exadata Storage Cells running version 11.2.3.3.0 were recently introduced into the Exadata 11.2.0.2 or 11.2.0.3 Cluster. 

Examples of this situation include:

a.)  you are performing rolling cell patching

b.)  rack expansion with new Exadata hardware running version 11.2.3.3.0

Cause

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