Block loss after dense restructure

Summary:

Dense Restructure from adding a Dense account member and refreshing the database resulting in block loss.

Content (please ensure you mask any confidential information):

We have a very large freeform cube with a block size of around 400kb. Our accounts dimension is Dense with around 5,000 total members. We have a nightly process that loads metadata to this cube to add any new accounts that may have been created in our ERP. Our process adds these accounts to a "new account" hierarchy, and then users will log in in the morning and add them to the correct spot in the hierarchy. We recently experienced an incident where we received a new account to the "new account" hierarchy, and a user