物化视图的作用力和完整性

Question

What is the difference between force and complete refreshes in Materialized Views

CREATE MATERIALIZED VIEW MV1 REFRESH FORCE ON DEMAND AS SELECT * FROM T1;
CREATE MATERIALIZED VIEW MV1 REFRESH COMPLETE ON DEMAND AS SELECT * FROM T1;
CREATE MATERIALIZED VIEW MV1 REFRESH ON DEMAND AS SELECT * FROM T1;

Need Just a brief difference between these statements?

Answer 1

COMPLETE

Refreshes by recalculating the materialized view's defining query.

FAST

Applies incremental changes to refresh the materialized view using the information logged in the materialized view logs, or from a SQL*Loader direct-path or a partition maintenance operation.

FORCE

Applies FAST refresh if possible; otherwise, it applies COMPLETE refresh.

NEVER

Indicates that the materialized view will not be refreshed with refresh mechanisms.

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