Hi I am running 8.1. I started a big delete of the database ( I have 25000 books in it.) I am sure there was a better way than just selecting all and removing books. Well anyway I did it and it started. I went to bed as it processed it. Well when I came back to it in the morning it had stopped processing!!! It was onlly halfway through. Windows had gone to sleep even though there was work to be done. Calibre was the only user programme running. I am using Calibre 2 ( beta) just downloaded for this application. As soon as I moved the mouse it started up and continued processing.
A search on the net revealed the following
""Actually, the "secret handshake" is publicly documented and a very easy-to-use API. It's probably best to lay the blame at a vendor's feet for not keeping a machine awake when it's doing something it thinks is of utmost importance, rather than blaming Microsoft's environment that has been this way since 2000 (at least). Also, other power state options are also well documented, so applications that "must" keep the system awake (and don't) are to blame in this case. ""
Does your programme keep Windows awake for long processing jobs?
regards
Alan