It is also useful to use a retry for an operation which is not transactional, like a call to a web-service or other remote resource. For example:

0   |  TX {
1   |    input;
1.1 |    output;
2   |    RETRY {
2.1 |      remote access;
|    }
|  }
		

This is actually one of the most useful applications of a retry, since a remote call is much more likely to fail and be retryable than a database update. As long as the remote access (2.1) eventually succeeds, the transaction TX(0) will commit. If the remote access (2.1) eventually fails, then the transaction TX(0) is guaranteed to roll back.