Domino 9.0.1 Feature Pack 8 enables moving views out of the database. This will make the NSF smaller and therefore can store more data before reaching limits.
Set the following value in the server Notes.ini:
NIFNSFEnable=1
NIFBasePatch=F:\NIF (or leave out to create in Data folder)
CREATE_R9_DATABASES=1
CREATE_NIFNSF_DATABASES=1
Restart the server.
Use "load compact -c -nifnsf on xx.nsf " to move the views out for existing databases.
More info at: https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_9.0.1/admin/admn_moving_views_out_of_databases.html