Hi All,

We have one business critical materialized view( let’s called 
materialized_view_1) which contains around 16M records.
This materialized view is refreshed CONCURRENTLY every 1 minute, and got 
refreshed normally (without CONCURRENTLY) every 6 hours.

But from time and time, we found that it took forever to refresh materialized 
view( normally or concurrently), and there is no response to query from this 
materialized view.
In this case, we have to create new materialized view(materialized_view_1_new) 
with exactly the same definition, and the new materialized 
view(materialized_view_1_new) works well and the refresh finishes in 15 seconds.
And after about 1 months, we have to do this again: I mean use freshly new 
materialized view to replace the old one.

It looks like there are too much garbage in the old materialized view as time 
going.
Any idea how we can fix this materialized view refreshing problem?

Thanks

Hellen Jiang

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