Tanel,
” but basically what it shows is that the SQL_EXEC_ID consists of the query coordinator’s instance_id value and the execution number for a SQL_ID in the instance where the query coordinator session was logged in:”
I think it uses the instance if of teh QC to keep track of where the PX query origniated from.
While the Instance id of the query coordinator is used to keep track of where the QC session resides, I would think it is using the execution count based on the instance on which the PX slave(s) is running and not the execution number from the instance where the QC is running. If that was the case, the max(xxx) value you posted will all be the same. Is it not?