V$METRICGROUP displays information about the metric group for each of the four major Streams components: capture, propagation, apply, and queue.
| Column | Datatype | Description |
| GROUP_ID | NUMBER | Internal ID associated with each group |
| NAME | VARCHAR2(64) | External name of the group |
| INTERVAL_SIZE | NUMBER | How often to collect statistics |
| MAX_INTERVAL | NUMBER | Total number of intervals over which statistics should be collected |
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