Two types of restarts exist:
When a software or hardware failure occurs, the Teradata Database system automatically attempts to bring itself back up into an operational state. This type of restart results in an automatic execution of a Teradata Database system-recovery operation. As part of the restart processing, the Teradata Database system saves the error codes that were generated, reloads Teradata Database system software, and enables logons.
Manual restarts are activated by the user. Users can initiate a restart from any of the hardware switches or by one of the following methods:
where comment-string briefly describes the reason for the restart.