13.1. Monitoring Tablespace Storage
Oracle 10g manages the disk space in two ways: reactively and proactively. Through database alerts, you are notified of tablespace disk space usage at two different levels: warning level and critical level. By default, the warning level is 85 percent, and the critical level is 97 percent. While these levels are by definition reactive, they can arguably be considered proactive in that you will have an opportunity to increase the amount of space in the tablespace before it runs out of space.
In a truly proactive manner, Oracle 10g collects statistics on space usage in the Automatic Workload Repository (AWR) at 30-minute intervals to assist you with tablespace and segment growth trend analysis and capacity planning. ...
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