What info is contained derby folder under adminui install path ?
It is contained about IAM security permissions. (login to AdminUI, create, read and delete object...etc)
When you update some object in AdminUI, IAM read this permissions in derby at first.
If user who update some objects is granted for this task, he can update some objects in Policy Store.
And, the size dat files under derby folder are increased, or new dat files are created.
1. ADMINUI_INSTALL\server\default\data\derby\siteminder\taskpersistence :
Its folder contained security policy to create, delete, read...etc objects, and info of submitted tasks in AdminUI.
The workarround to cleanup submitted tasks, run cleanup submitted task in AdminUI as below.
a. Login to the Siteminder Administrative UI as the Siteminder Administrator
b. Go to the Cleanup Submitted Tasks UI under Administration->Admin UI
c. Select "Execute now" and select "Next"
d. Select the "Minimum Age". e.g 30 Minute
e. Select "Finish"
But, you can't cleanup submitted tasks by its button, because of product issue.
This issue will be fixed in future SP of 12.7 and 12.8.