https://www.databasejournal.com/oracle/hybrid-histograms-in-oracle-12c/
https://hourim.wordpress.com/2016/01/20/natural-and-adjusted-hybrid-histogram/
https://chinaraliyev.wordpress.com/2018/11/06/understanding-hybrid-histogram/

http://www.br8dba.com/store-db-credentials-in-oracle-wallet/
https://backendtales.blogspot.com/2023/02/santas-little-index-helper.html
Asymmetric Dataguard with multitenant
https://oracleandme.com/2023/10/31/asymmetric-dataguard-with-multitenant-part-1/

https://backendtales.blogspot.com/2023/02/santas-little-index-helper.html
https://github.com/GoogleCloudPlatform/community/blob/master/archived/setting-up-postgres-hot-standby.md

# cursor: pin S wait on X
https://svenweller.wordpress.com/2018/05/23/tackling-cursor-pin-s-wait-on-x-wait-event-issue/

# pin cursor in shared pool
https://dbamarco.wordpress.com/2015/10/29/high-parse-time-in-oracle-12c/