Connection with database failed. Database instance might be down. Try again once it is up.

Connection Fail
Connection with database failed. Database instance might be down. Try again once it is up.

Detail >
[IOErrorEvent type=”ioError” bubbles=false cancelable=false eventPhase=2 text=”Error #2032″]
If I click OK, it gives:
 
Error
Unexpected error caught by function “EMBaseController:onParseSuccess”
Detail >
TypeError: Error #1009

Resources and SQL Monitor – Last Hour (max20) regions do not load, and show “Error” in the little box where “Loading..” was before

 Solution:-

Apply Patch: 16527374
p16527374_121010_Linux-x86-64.zip
[12100-LIN64-130318]CDB:ORA-07445:EM EXPRESS HOME GOT IO ERROR (Patch)
This patch is Online Patchable.