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username,machine,port information and get to the actual process which holds the connection

Oracle Tablespace Size in GB

Finding the source of failed login attempts. (Doc ID 352389.1)

CREATE GUARANTEED RESTORE POINT

Blocking Sessions

Run SQL Tuning advisory manually.

RMAN Clone on same/different servers

ALL PREVIOUS HISTORY RUN DETAILS OF SQL_ID FROM AWR

Find historical blocking sessions

FlashBack 12c-19c failed upgrade.

Sql Profiles