Item versions has an excessive amount of items. The size of the table is well above 10,000 rows and / or the itemversiondata table is taking up too much space.
Note that each item has less than 5 versions.
No specific error. This may manifest itself in slow console usage or by a large amount of disk space used by the itemversiondata table.
This is often caused by solutions creating unneeded items.
You must contact support for the resolution to this issue.