Ok, i'm not working now, but monday i tell you some data of ERRORLOG.

PD: i haven't backup of master db.-

"Log backups are done on regular interval.", if you manage a lot of online transactions, you may bkp your transaction log, every 10 minutes for example. And then your log...

You need to follow up and perform a transaction log backup. I am going to guess that your database is set to full recovery model (with a xxxGB transaction log...

Make a transaction log backup, you have a lot of transactions in it, and this thing put all in your DB, and the LOG will be more little. (I think...

Obviously the account under which the maintenance plan is executed has not enough permissions. See accounts in SQLAgent.-

Yes Marcus, somebody, "SO administrators delete the user", "i notice FBI". Then in the Connection of the SQL Agent properties, i use the sa user, and finish the problem....

I dont change the user, but this occurs 2 weeks ago and without any change for me. I use sa or other user who have admin rigths. In other DB...

Thanks, here the reports. I have dbo rights, but i dont undertand, this happend 2 weeks ago.