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A gotcha with parallel index builds, parallel degree and query plans

Reading the following article about PARALLEL hint by Jonathan Lewis made me remember a somewhat related gotcha with parallelism.
Often when creating (or rebuilding) an index on a large table, doing it with PARALLEL x option makes it go faster – usually in case when your IO subsystem is not the bottleneck and you have enough spare CPU capacity to throw in.
A small example below:
Tanel@Sol01> create table t1 as select * from all_objects; Table created.