QZDASOINIT is the jobname for the database SQL server jobs on the System i. These jobs are used to serve SQL to JDBC and ODBC client applications. The jobs run the default QUSRWRK subsystem. iSeries Nav jobs also use this job name when running a query through the SQL window in Operations Navigator.
Another thing you need to know about these QZDASOINIT jobs, is that they can slow down your system when there are too much of them active, especially when running batch processing, if for example you notice a difference between similar batch processes where one day the process will run for four hours and then all of a sudden the same process will take up to the double amount of time, there is where you want to get rid of these jobs.