Here’s another one of those little changes that sidles in when you’re not looking.
When locally managed tablespaces first appeared, there were a number of posts on Usenet (comp.databases.oracle.server) and the metalink lists (the OTN database forum didn’t exist at the time) about “missing” space in data files. The commonest sort of comment was along the lines of
“I’ve created a data file of 100 MB, how come I can only create 99 extents of 1 MB each?”
“I’ve created a data file of 10 GB, how come I can only create 9 extents of 1 GB each?”
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