Generally, Ingres uses less transaction log file space than Ingres 6.4. A few operations may use more (for example, MODIFY TO MERGE). To allow for its improved logging algorithms, Ingres reserves transaction log space that it may not actually write.

The force-abort limit cannot be set as close to log-full as was possible in Ingres 6.4.

If your Ingres 6.4 transaction log was barely large enough, it may be advisable to increase the size before or during the upgrade.