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I need some explanation on an error: "ORA-28000: the account is locked." I am running my package procedure which has a remote link to another database. The link already exists and works. When I checked my account in SQL*Plus, I found that the account was not locked. Without any changes I was able to run the package again in 30 minutes with no errors.
From your description, it looks like your account is locked for a short while, and then is unlocked. The most common reason is that your user's profile is locking the account due to too many invalid logon attempts. After a predetermined time, the account is automatically unlocked. The FAILED_LOGIN_ATTEMPTS resource of the profile determines how many times a login attempt can fail before the account is locked. This account is locked for the number of seconds defined by the PASSWORD_LOCK_TIME resource of the profile.