Thanks for that addition. After over 2 decades of DBs being retentive by default in STEP 7 V5.x (you had to go and make them non-retentive if you wanted!), now you have to do the opposite.
In addition, you now mark it retentive tag by tag, instead of for the whole DB (as long as you're using the default optimized setting). Retentive memory is still limited, of course, unless you use the special PM HF that gives you extra buffering.