In certain circumstances SAP IQ 15.4 server could go into a hung state.
If you look at the pstacks generated on the hung server you should see threads with the following stack:
SAP IQ 15.4
Sybase, cr770203, CR770203, 770203, stktrc , hang, deadlock , KBA , BC-SYB-IQ , Sybase IQ , Problem
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