So, there was no snc problem with the database. I found the error in plesk.log .
I had added a wrong entrie to the DNS template. This produced an error if I try to add a new domain. My fault was to define a A record for ipv6 and nit AAAA
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[2016-10-21 15:47:55] ERR [panel] Domain update failed: Unable to update domain data: Unable to add the *.fdgfgdgf.fr. IN A 2001:4ba0:cafe:a64::1 record to zone fdgfgdgf.fr: Incorrect DNS record values were specified.
[2016-10-21 15:47:55] ERR [panel] Unable to load object of type BsDomain with id=4: Domain does not exist.