These are the best practices for securing these accounts:
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Change the default passwords on both accounts.
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Do not delete the accounts. Rename them, if desired.
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Only authorize a limited set of trusted users to use these accounts. These users should be trained in using the accounts responsibly, as well as safeguarding them.
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Do not use these accounts when testing a solution or troubleshooting a situation. These accounts may not reflect the constraints of a user-created account.
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Monitor logs for unexpected use of these accounts.
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Whenever possible, lock or disable these accounts to prevent misuse.
Tip:
For more information on configuring user accounts, see the System Administration module reference guide.