■19c
Oracle Database 19c 新機能
https://docs.oracle.com/cd/F19136_01/whats-new.html
https://docs.oracle.com/cd/F19136_01/newft/new-features.html#GUID-5490FE65-562B-49DC-9246-661592C630F9

■21c
Oracle Database 21c 新機能
https://docs.oracle.com/cd/F39414_01/whats-new.html
https://docs.oracle.com/cd/F39414_01/nfcon/index.html#Oracle%C2%AE-Database

Oracle データベース 21c
https://docs.oracle.com/cd/F39414_01/whats-new.html

■23c
Oracle Database 23c 新機能
https://docs.oracle.com/cd/F82042_01/nfcoa/#Oracle%C2%AE-Database

■サポート終了および非推奨となった機能
https://docs.oracle.com/cd/F19136_01/upgrd/oracle-database-changes-deprecations-desupports.html#GUID-44E0A12C-2918-4565-BB19-A1CBA4C0FDCD

exadataの非互換
https://docs.oracle.com/cd/F86788_01/dbmso/new-features-exadata-system-software-release-23.html#GUID-8261F9B2-631C-47DC-A5EE-57A0E296CE1D

https://teams.microsoft.com/l/message/19:17a4f3446fc3423a9952bb10316cbcfa@thread.v2/1711533662865?context=%7B%22contextType%22%3A%22chat%22%7D

#oracle23c
#Oracleドキュメント