If IMPDP hangs long time, and if checking in v$sessionwait shows it is waiting on “wait for unread message on broadcast channel”, check the alert log. You may see something like:
statement in resumable session ‘SYSTEM.SCHEMAIMPORT.1′ was suspended due to
ORA-01658: unable to create INITIAL extent for segment in tablespace TESTDATA
Solution:
Tablespace full in other words, and will need to be extended for the IMPDP to continue.
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