You can safely ignore the Null event but you may not want to ignore the null event. No, this is not a typo. Pay attention to the case. The Null event becomes null event starting in Oracle9i Database, and it is a major nuisance. It not so much because the case is changed; it’s mainly because a bug #2843192 causes many events to be inaccurately reported as the null event in the V$SESSION_WAIT view. This is an important view for root cause analysis. You can quickly find out if this bug affects your version of Oracle. Query the V$SESSION_WAIT view in a few quick successions during active processing. If you see the null event reported in the output, you should obtain and apply the appropriate patch for the bug, or upgrade to Oracle Release 9.2.0.4. Some patch numbers are listed in Table 2-3, but you should always consult Oracle Support for the right patch, or patchset, for your platform.
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