Incremental statistics, are you doing it right?

If you implemented incremental statistics in releases before Oracle 12.2, you may not be taking full advantage of them. Learn how to do it!
Troubleshoot: a non-regular solution for “ORA-01502 index is in unusable state”

How an error caused by running analyze on a table with unusable indexes is solved with regular expressions and dbms_stats.
AutoUpgrade, my first incident

AutoUpgrade fails if the server names are in uppercase, and you are working with an RAC One Node database.