Fail to delete imported users from Oracle configured with Liferay - oracle

I have imported users in liferay(configured with oracle database) using OpenDJ, there are users in oracle database and also displayed on Liferay but when I tried to delete the users from liferay its not deleting it from oracle database.I don't understand the problem. Any Help will be appreciated.

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How to use tables from database in apex 19.2

I've installed Oracle APEX 19.2, on database 12.2. And I don't know how to use tables which exist in database. For instance, I have table 'test' in database and I can't use this table in app builder. I searched in google, but I couldn't find appropriate answer.
Thanks in advance
When you create a workspace, you have to "pair" database users (schemas) with your workspace. It is done in administrative part of Apex (you have to log in as ADMIN).
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You may be interested to read Mike's response to a question with a similar misunderstanding regarding architecture.
https://community.oracle.com/thread/4135843
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