Hello
I had very similarproblem, or lets say two problems and both of them were related to SQL database and issues with the connection.
1. The first one which was slightly easier was related to the account I was using to connect to the DB. Lets say my DB account was named DBUSER which was SQL account. I had to change the password and I did it following the wrong order. I reset the password on the SQL server first, before I set the new password on the VI client. The VI client keeps the password encrypted into the registryand there was no way to reset it. The solution was this:
1.1 Give any other account (SQL or AD) access to the database. Go to the host where the VIclient is installed. Open a connection to the virtual center and specify the new account which you just granted access to the DB use the new password. Establish a connection and make sure everything is OK. Then , go back on your SQL server grant the previous account access to the database and set the new password. Go back to your machine where the VI client is andinitiate a connection to the virtual center server, but at this time speciy the other account and the password.
This is what was helpfule for me
2. The seconproblem happened on Monday this week. This is much more complicated problem. The VM Ware Server service stopped working and the error message into the event logwas "dbSQL connection failed, nocorrect data, corupted data was savad into aone of the database tables" The ticket i have opened with VMWare is still opened and they are analysing what has happened causing the database to become corrupted. The sollution was: Restore the database from the last night backup.
I hope this could help you
Sincerely
Ivaylo