java.sql.SQLException: ERROR: XLogFlush: request 0/240169BC is not satisfied --- flushed only to 0/23FFC01C This error I was in the logs of a java process that was failing to get some data. But using psql I was able to connect and query all the data. Thus this may indicate some connection / statement isolated problem but I am not sure about that. I would like to understand; When/why do we get this error? And can we avoid or detect this?