When an AMP fails to come online during system recovery, which is done using the down AMP Recovery Journal, Teradata Database continues to process requests using fallback data. When the down AMP comes back online, down AMP recovery procedures begin to bring the data for the AMP up-to-date as follows.
|
IF there are… |
THEN the AMP recovers… |
|
a large number of rows to be processed |
offline. |
|
only a few rows to be processed |
online. |
After all updates are made, we consider the AMP to be fully recovered.