Database select-only verbosity

Without noticing, I filled up my wordpress database and since I don’t have an unlimited size, my host put it in ‘select-only’ mode.

Trouble is nowhere in WordPress I could find what was wrong !
I didn’t get any errors saying ‘unable to insert’ or whatever.
Only message I got was ‘Send for review’ on a new post instead of ‘Publish’.

I only figured the problem once I logged on my host.

Any verbose in wordpress would be much appreciated !