A possible cause may be SGA latch contention
The theory is that while the shared_pool was being re-sized in the SGA, Oracle grabbed a latch. The memory resize operation took a while and while Oracle held that latch, nobody could login.
See the following link : http://marist89.blogspot.com/2009/08/sga-latch-contention.html
New OA Framework 12.2.6 Update 5 Now Available - Web-based content in Oracle E-Business Suite Release 12 runs on the Oracle Application Framework (also known as OA Framework, OAF, or FWK) user interface l...
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