Is there any verbose flag that could cause vCenter db overfilling in ESXi cluster?

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http://serverfault.com – I have SQL Server express installed on vCenter, so the maximum size of the database can be only 4GB. I don't know why, but from some moment the size of the db started to grow exponentially, so I have to delete the data which is older than 40days with the script provided on the vmware site (VCDB shrink sql or so ..) The question is, is there any verbose/debug flag, which I accidentally enabled time ago, so the DB is filling more rapidly? The VMs count did not change in the past and I did not change anything substantial in the infrastructure. Or maybe everything is behaving alright and the SQL (HowTos)