I can’t speak to wM8, but in 7.1.2 there is an archive/delete process instance data and log data from the database in the MWS.
MWS → Admin console → Administration → Business → data management–> Archive Audit Data.
There is some setup depending on your database tablespaces. The ARCHIVE tablespace database user needs to have select and delete premissions on the ISCORE and Process Audit Database components.
After you’ve configured the environment, I recomend creating a simple flow service to archive and delete data and schedule it to repeat once or twice a week.
See the Monitor’s User Guide.
Again this is for 7.1.x, I’m unsure how much has changed between the 2 versions.
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