What I have seen from the managers I worked for, is a systematic sabotage of their employees ability to work with other employees on the team. They try to build resentment between people on their own teams. Generally, this has to do with telling different people on the team different things.
Belittle someone's work to another employee, so the other employee joins in with that. To the belittled employee, talk about how nasty the other person is.
Assign a new project to someone on the team, person A, and tell a couple of other employees that that person A will decide who gets to work with them on the new project. Manager does not tell person A that they are making any decision. The other two people begin to s--- up to person A and person A doesn't know what's going on because they were told they were the only person working on the project. The other two people will think they have been slighted. Manager then tells the other two people that person A "just didn't want to work with you".
Manager heaps praise on the most incompetent or laziest employee. Others resent it.
Manager makes up some lie, so-and-so just doesn't want to work with you, so-and-so is just lazy so don't work with them, so-and-so works from home and they don't do anything, etc, etc.
If you are in a group where your manager is telling you things like this, you need to realize that these things are not real, the manager is manipulating you to make sure you don't all get together and disagree with him or worse, demand formal reviews, etc.
One of the purposes of a manager to make sure that the people get along with one another and can function as a unit where people help each other out. I have seen this at other companies, but NOT at Oracle.
Beware what your manager says and how you are being manipulated into isolation.