I am starting this discussion on behalf of a client:
Especially the "veterans" of AS/400 remember, that in the beginning of SAP on AS/400 it was often necessary to stop the SAP instance and delete the SQL packages in order to overcome database errors that usually showed up as SQL -901 errors. This way of "fixing" SQL -901 became like a habit, so that support employees often recommended to stop the SAP instance and delete SQL packages when a simple restart of the failing work process would have fixed the problem. Later we recommended to use profile parameter rdisp/wp_auto_restart to restart work processes automatically once a day (for example), and that seemed to have solved the problem. However, my client is not quite convinced that this works and does not want to "play" with the production system. They are using an ECC 6.0 system with a 10 TB database and about 4000 active users.
Question to this group: Do you have systems with a similary size that run several weeks (or even months) without interruption for deleting SQL packages? If so, do you use profile parameter rdisp/wp_auto_restart, and what value is configured? Also "negative" answers are welcome, i.e. if you have the experience that the SQL packages must be deleted on a regular base for the sytem to work properly, please let us know, too.
Thanks a lot for your cooperation.
Kind regards,
Christian Bartels.