SAP Netweaver: "Login limit is reached. Try again later"

http://scn.sap.com/thread/1350039

Finding an oracle constraint by name

SELECT owner, table_name
  FROM user_constraints
 WHERE constraint_name = <<your constraint name>>

or if you have sysadm privileges: 

SELECT owner, table_name
  FROM dba_constraints
 WHERE constraint_name = <<your constraint name>>