Question -
You want to be warned automatically when more than 100 sessions are opened with your database instance.Identify the action that would help you achieve this.
Options:
A .  Set the TRACE_ENABLED parameter to TRUE
B .  Set the threshold for the Current Logons Count metric
C .  Set the LOG_CHECKPOINT_TO_ALERT parameter to TRUE
D .  Set the SESSIONS_PER_USER limit in the profiles used by users
Answer: Option B
A metric is defined as the rate of change in some cumulative statistic. This rate can be measured against a variety of units, including time, transactions, or database calls. For example, the number database calls per second is a metric.
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