We've encountered a problem with corrupt bitmap indexes on partitioned tables in Oracles 18.104.22.168. With Oracle's help we're making progress towards a solution, which appears to involve something called a 'Haken Factor'.
I gather this is an attribute of a table which is involved in sizing bitmap indexes, it appears in the SPARE1 column of sys.tab$.
Does anyone know anything about the Haken Factor, Metalink has quite a few references, Google almost nothing relevant. I can see that it's important, but I'm looking for a better explanation of what it is.