Just for the record, unlike SQL Server and MySQL, Oracle does not have a READ UNCOMMITTED isolation level. As Tom Kyte says, The goal of providing a dirty read is to supply a nonblocking read, whereby queries are not blocked by, and do not block, updates of the same data. However, Oracle Database doesn’t need dirty reads to achieve this goal, nor does it support them. Dirty reads are an implementation other databases must use to provide nonblocking reads…