9.6.1 About Metrics

Exadata metrics are recorded observations of important properties or values relating to the Exadata system software.

Exadata metrics contain detailed statistics for most Exadata components.

Metrics are of the following types:

• Cumulative metrics are statistics that accumulate over time since the metric was created or the server was restarted.

• Instantaneous metrics contain the current value at the time of the metric observation.

• Rate metrics are computed statistics where the value is observed over time.

By default, metric collections occur at 1-minute intervals. Metric observations in the default collection are initially recorded in memory and later written to a disk-based repository. For most metrics, historical observations are maintained for seven days by default. However, a subset of key metrics are retained for up to one year. Starting with Oracle Exadata System Software 24.1.0, you can view and control which metrics to maintain for up to one year. In all cases, Exadata automatically purges historical metric observations if the storage server detects a shortage of space for the disk-based metric history repository.

Commencing with Oracle Exadata System Software 22.1.0, you can optionally configure fine-grained metrics. To enable fine-grained metrics, you must specify a collection interval between 1 and 60 seconds. You can also choose the metrics to include in the fine-grained collection. Fine-grained metric collection is the foundation for real-time metric streaming. Consequently, fine-grained metrics are only recorded in memory to support efficient streaming to an external metric collection and visualization platform.