ORA-00060 while running multiple DELETE queries on one table

I have a multi-user application, which allows many users to perform DML operations on Database tables. Under a particular scenario, 2 users are trying to perform DELETE on one Table through different transactions.

The problem is, transaction 1 is a long running one, and acquires Row Lock on the Table for a long period of time. So transaction 2(attempting to modify the same rows) errors out with ORA-00060.
Also, I cannot do an Execute Immediate for DELETE queries on transaction 1, sue to some data integrity issues.

How can I modify DELETE query to mimic something like the behavior of NOLOCK in SQL Server?

Source: oracle

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