Oracle DBaaS 1z0-160 part 8:How to connect your oracle cloud database from 1521 port using sql developer/TOAD | clouddba:-DBA blog on Oracle,Oracle cloud,DevOps,PostgreSQL and Other Databases
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ThinkIT] 第5回：サーバーのリスナー情報の設定を行おう (1/3)
Oracle Database Cloud — Open Ports on OCI | by Fathi Riadh | Medium
