Rollback extension

A transaction has to extend its size because the current rollback is not large enough to contain all the rollback data

Rollback contention

There are not enough rollback segments; therefore some transactions requesting rollbacks must wait for a rollback segment

Chaining and dynamic extension

The current extents assigned to tables, indexes, and rollback segments are insufficient to handle growth

Excessive I/O on hard drives

Data files are not spread among disks, resulting in degraded performance

Memory paging

Memory is insufficient to accommodate processing requirements; contributes to excessive I/O on hard drives