Thx Vupdraft for your quick response!
Its a midwife Website for pregnant women, ten years online. Error appeared directly after activating. I even couldn’t open the help manual cause link doesn’t work. wp-config.php seems o.k.
Database is 47 MB, 133 Tables InnoDB latin1_german1_ci. Big size comes from many revisions, course data usw.
wp-optimize folder is 10,4 MB with 1121 Files and 233 Folders. It seemed as if wp-optimize was hanging trying to load db tables but couldn’t. In wp-optimize I tried to delete settings (if there any) under settings but doesn’t work so I deleted whole wp-otimize folder.
I also called our provider to have a look at the Database.
This website has never been offline that long and the poor midwifes have to check all over phone now.
So if there is anything else I can try please let me know.
Best Wishes
Michael