Why these warnings in the application server log on environment startup

Document ID : KB000014272
Last Modified Date : 14/02/2018
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Question:

On the first start of the IM environment the tables were created in the database. However, I did notice the following in the server.log. What is the reason?

12:39:58,877 WARN [ims.jdbc.JDBCSchema] (ServerService Thread Pool -- 67) Column updated for USER_NAME in table IM_AUTH_USER with type varchar(32)

Answer:

Database schema defines the type of the column USER_NAME as varchar32, but IM metadata defines  the same as nvarchar2(255), so during startup, when they are compared, a warning is given if they differ.

This will not have any problem/impact on the Identity Manager. as this table is used only for authentication to management console.