Slow Complete Refresh of Materialized View in Oracle Database

The status of the materialized view with 30 million records is ‘UNUSABLE’, so a complete refresh is required to fix this problem .

The complete refresh process ran for 3 hours, then we have to kill it.

SQL>  execute dbms_mview.refresh(MVIEW1','c');


BEGIN dbms_mview.refresh('MVIEW1','c'); END;

ERROR at line 1:
ORA-12152: TNS:unable to send break message

Elapsed: 03:11:16.16

There are a couple of following ways to speed up this complete refresh, one of them only takes 27 minutes.

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