Authentication in IBM Websphere Portal
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I'm involved in an Java Web Application Migration project to IBM Websphere Portal (IBM WP) Platform.

The actual application in production environment validates manually user credentials (username and password) against a Database Table that stores the data. I understand that the idea behind  a Portal application is that the Portal Container handles this Security issues, but I'm not sure how IBM WP can consume the credentials that now are on Database.

There's a brand new Tivoli Directory Server in the Company, and I'm aware that I can't connect IBM WP to this LDAP Server so, do I need to migrate every user in the Database to this LDAP Server, or there's a Way that Tivoli recognize the credentials that are on the database?