Oracle Materialized View | Deletion of Records, Oracle Materialized View

One question reg Materialized views.
If as part of housekeeping of the Source database we delete some records (older records), will the materialized view also be updated with the deletion?
I believe the answer is yes. In that case can we ensure that this delete does not happen?
Is there anyway we can prevent MView refresh from deleting the records that is once inserted even if we delete the same records in source DB?

This is a common scenario, particularly with materialised views that summarise detail data where you want to keep the summary but not the detail, and it is addressed in the documentation.
The technique is to make the MV refresh on demand, delete the data from the detail tables, and use the CONSIDER_FRESH procedure to prevent the changes propagating to the MV. You'll probably find it in the docs by searching on DBMS_MView.Consider_Fresh. There are a few warnings to note I think.

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    >
    Steve Johnson wrote:
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    Message was edited by:
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  • Materialized View, ORA-12008: error in materialized view refresh path

    I want to refresh a materialized view, but I get an ORA-12008 error.
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    crupper wrote:
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    Oracle related stuff blog:
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    SQLTools++ for Oracle (Open source Oracle GUI for Windows):
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    On the test system there are no other sessions connected and no records for the view in V$Access.
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  • Mass Creation of Material Group Purchase info record

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