Oracle Cloud Infrastructure Documentation

Plan and Monitor Capacity

You can monitor and plan the compute and storage resources of your Autonomous Database on Dedicated Exadata Infrastructure for efficient usage and optimal billing.

Oracle Autonomous Database provides dashboards and visualizations to help you track resource allocation and usage for your service.

Parent topic: Service Monitoring

Resource Terminology

It is important to understand the various terms used with resource allocation and usage on the Oracle Cloud Infrastructure (OCI) console and understand what they mean:

  • Available CPUs: CPUs available for allocation to provision new Autonomous Databases or scale existing Autonomous Databases.
  • Provisioned CPUs: Total CPUs allocated for all the Autonomous Databases within an Autonomous Exadata VM Cluster (AVMC).
  • Reserved CPUs: Total CPUs reserved to support auto-scaling of Autonomous Databases, Autonomous Database failover on node failure, and life-cycle management of empty Autonomous Container Databases (ACDs).
  • Reclaimable CPUs: Total CPUs from all terminated and scaled down Autonomous Databases in all the Autonomous Container Databases (ACDs) within an Autonomous Exadata VM Cluster (AVMC). Reclaimable CPUs are not returned to the Available state until the ACD is restarted.

    Tip:

    See Compute Management in Autonomous Database for a detailed explanation about the CPU types with examples.
  • Provisionable ACDs: Number of Autonomous Container Databases that can be created in an Autonomous Exadata VM Cluster (AVMC).
  • Provisioned ACDs: Number of Autonomous Container Databases that have been created in an Autonomous Exadata VM Cluster (AVMC).
  • Non-provisionable ACDs: Number of Autonomous Container Databases that cannot be created because of a shortage of available CPUs in an Autonomous Exadata VM Cluster (AVMC).
  • Total Storage (in TBs): Total storage allocated to an Autonomous Exadata VM Cluster (AVMC).
  • Available Storage (in TBs): Storage available for Autonomous Databases’ use in an Autonomous Exadata VM Cluster (AVMC).
  • Used Storage (in TBs): Storage currently used by Autonomous Database(s) in an Autonomous Exadata VM Cluster (AVMC).
  • Memory per CPU (in GBs): Memory allocated to the Autonomous Exadata VM Cluster (AVMC) per CPU.

Resource Limits

The following table lists the resource limits for Autonomous Database on Dedicated Exadata Infrastructure deployments on Oracle Public Cloud and Exadata Cloud@Customer.

Resource Limits (Maximum)

  • The number of Available CPUs determines the maximum number of Autonomous Databases that you can create. The smallest Autonomous Database can be created with 2 ECPUs or 0.1 CPUs. Therefore the maximum number of Autonomous Databases that can be created is half times the amount of Available ECPUs or ten times the amount of Available OCPUs.

  • The maximum number of Autonomous Container Databases per Autonomous Exadata VM Cluster (AVMC) is 16.

Recommended Resource Limits (Maximum)

Resource Recommended Limit
Autonomous Databases per Autonomous Container Database 200
Autonomous Databases per Autonomous Container Database with Autonomous Data Guard Configured 25
Note

It is possible to provision more Autonomous Databases than those mentioned in the above recommended limits table, especially with CPU overprovisioning. However, this implies compromising the Service Level Objectives (SLOs) to return an application online following an unplanned outage or a planned maintenance activity. To know the SLO details for Autonomous Database on Dedicated Exadata Infrastructure deployments, see Availability Service Level Objectives (SLOs).

Limits for Autonomous Exadata VM Clusters

You can create multiple Autonomous Exadata VM Clusters (AVMCs) on an Exadata Infrastructure resource. There are no hard limits on the number of AVMCs or Autonomous Container Databases (ACDs) you can provision on your Exadata Infrastructure. The AVMCs and ACDs have a minimum resource requirement, and you can create them as long as the minimum amount of resources is available.

To create an Autonomous Exadata VM Cluster, the minimum resources required per node are 5 OCPUs or 20 ECPUs, 100GB Memory, and 334GB Local Storage. You also need at least 2.87TB Exadata Storage per AVMC. Similarly, the minimum resources needed per node to create an ACD are 2 OCPUs or 8 ECPUs and 50GB Local Storage. As long as your Exadata Infrastructure has these minimum resources available, an AVMC and ACD can be created.

The following example shows the minimum X9M Exadata Infrastructure resources required to provision an AVMC (configured with 2 DB servers) with different number of ACDs.
Note

Database memory per ECPU (GB) and Database storage (TB) are set to 3GB and 2TB, respectively.
Property 1 ACD 2 ACDs 3 ACDs 16 ACDs
ECPU Count 40 40 48 256
Memory (GB) 200 200 224 848
Local Storage (GB) 677 780 883 2222
Exadata Storage (TB) 2.87 2.99 3.11 4.69

Resource Usage Tracking

The compute (CPU) and storage resources allocated to an Autonomous Exadata VM Cluster (AVMC) or Autonomous Container Database (ACD) vary as you provision and run Autonomous Databases in them. The number of allocated, provisioned, reserved, reclaimable CPUs and total, available and used storage change through the life-cycle of ACDs and Autonomous Databases in an AVMC. As you provision, run, and terminate Autonomous Databases or provision, delete, and restart ACDs, the compute and storage resources move into different categories as explained in Compute Management in Autonomous Database.

Tracking resource usage for an AVMC or ACD across tenancies is critical in planning the capacity for your Autonomous Database on Dedicated Exadata Infrastructure. To simplify resource usage tracking, Oracle Autonomous Database provides insights in graphical and tabular formats from the Oracle Cloud Infrastructure (OCI) console.

Autonomous Database on Dedicated Exadata Infrastructure supports resource usage tracking at two levels:
  • Autonomous Exadata VM Cluster (AVMC): You can view the resource usage details of an AVMC from its Details page on the OCI console. In-depth information on the resources is presented in a graphical and tabular format for the AVMC, and each ACD provisioned in the AVMC.

    Refer to View Resource Usage for an Autonomous Exadata VM Cluster for step-by-step instructions and explanation.

  • Autonomous Container Database (ACD): Similar to AVMC, you can also view the resource usage details of an ACD from its Details page on the OCI console. Comprehensive information on the resources in this ACD is provided on this page in graphical and tabular formats.

    Refer to View Resource Usage for an Autonomous Container Database for step-by-step instructions and explanation.

Resource Usage Visualizations

The resource usage metrics are presented on the OCI console in chart and tabular formats, for Autonomous Exadata VM Cluster (AVMC) and Autonomous Container Database (ACD).

You can access these resource visualizations in either chart or table format the OCI console, by following the instructions outlined in:

Tip:

You can choose to see this information either in the graphical or tabular view by selecting Chart view or Table view from the drop-down list at the top-right corner of this section.

This section has graphical and tabular representations of the AVMC's resource usage.

Chart View

Chart view is the default view. In this view, you can see 4 graphical visualizations that provide usage details for different resources:


Description of avmc_reschart.png follows

The four charts depict:
  1. CPU usage: Depicts the Total number of CPUs allocated to this AVMC and how many of those CPUs are reclaimable, available, provisioned, and reserved. This is a doughnut-chart with the total number of CPUs shown in the center of the chart.
  2. CPU usage at VM level: This is a horizontal bar graph giving a break-down of the CPU usage for each VM in the cluster. You find a horizontal bar for each VM. Each bar shows the number of reclaimable, available, provisioned, and reserved CPUs for that VM with color-coding. Hovering on each colored part of the horizontal bar displays the number of reclaimable, available, provisioned, and reserved CPUs for that specific VM. Clicking the reclaimable, provisioned and reserved bars will open a new panel with the break down of those CPU components by ACDs.
  3. Autonomous Container Database (ACD) usage: Depicts the Total number of ACDs that can be created in this AVMC along with a break-up of Provisionable ACDs, Provisioned ACDs, and Non-provisionable ACDs. Please see Resource Terminology to understand what each of these mean. This is a doughnut-chart with the total number of ACDs shown in the center of the chart.
  4. Autonomous Database (ADB) storage (in TBs) usage: This is a doughnut-chart depicting the available, used, and total Autonomous Database storage in TBs. The total storage value is shown in the center of the chart with available and used storage values shown on the chart in different colors.

Table View

To see the resource usage details of an AVMC in table view, select Table View from the drop-down list at the top-right corner of the Resource usage visualizations section. The table view shows the exact same details as the chart view, in the form of tables.


Description of avmc_restable.png follows

The four tables you can see are:
  1. CPU usage: Lists the number of total, available, provisioned, reserved, and reclaimable CPUs in this AVMC.
  2. CPU usage at VM level: Lists the number of available, provisioned, reserved, and reclaimable CPUs for each VM in this VM cluster.
  3. Autonomous Container Database (ACD) usage: Lists the number of provisionable, provisioned, and non-provisionable ACDs in this AVMC.
  4. Autonomous Database (ADB) storage (in TBs) usage: Shows the available and used Autonomous Database storage in TBs.

This section has graphical and tabular representations of the ACD's resource usage.

Chart View


Description of acd_reschart.png follows

Chart view is the default view. In this view, you can see a horizontal bar graph giving a break-down of the CPUs used by this ACD in each VM. Each bar shows the number of provisioned, reserved, and reclaimable CPUs for that VM with color-coding. Hovering on each colored part of the horizontal bar displays the number of provisioned, reserved, and reclaimable CPUs for that specific VM.

Table View


Description of acd_restable.png follows

To see the resource usage details of an ACD in table view, select Table View from the drop-down list at the top-right corner of the CPU usage at VM level section. The table view shows the exact same details as the chart view, in the form of a table. It lists the number of provisioned, reserved, and reclaimable CPUs for each VM allocated to the ACD from the parent VM cluster.

Exadata System Shapes

Autonomous Database on Dedicated Exadata Infrastructure can be provisioned on different Exadata System models such as Oracle Exadata X9M-2, X8M-2, X8-2, or X7-2 system models. Each model comes in different shapes as explained below. Each Exadata System Shape is equipped with a fixed amount of memory, storage, and network resources. All Shapes are based on Oracle Exadata X9M-2, X8M-2, X8-2, or X7-2 System Models.

The total resources allocated to your Autonomous Database on Dedicated Exadata Infrastructure is determined by the Exadata System (and shape) used to provision your service.

Tip:

Refer to Characteristics of Infrastructure Shapes to view the specifications of each Exadata System model.
Autonomous Database on Dedicated Exadata Infrastructure is offered in the following Exadata System Shapes:
  • Base System: Contains two database servers and three Oracle Exadata Storage Servers. A Base System is an entry-level configuration. Compared to other configurations, a Base System contains Oracle Exadata Storage Servers with significantly less storage capacity, and database servers with significantly less memory and processing power.
  • Quarter Rack: Contains two database servers and three Oracle Exadata Storage Servers.
  • Half Rack: Contains four database servers and six Oracle Exadata Storage Servers.
  • Full Rack: Contains eight database servers and 12 Oracle Exadata Storage Servers.

X10M systems on Exadata Cloud@Customer deployments are offered in the following Exadata System Shapes:

  • Elastic: Starts with two standard memory (1390 GB) database servers and three Oracle Exadata Storage Servers, and can be expanded up to a maximum of 32 database servers and 64 storage servers.
  • Elastic Large: Starts with two large memory (2090 GB) database servers and three Oracle Exadata Storage Servers, and can be expanded up to 32 large memory database servers and 64 storage servers.
  • Elastic Extra Large: Starts with two extra large memory (2800 GB) database servers and three Oracle Exadata Storage Servers, and can be expanded up to 32 large memory database servers and 64 storage servers.