> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blinkops.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Performance Insights Describe Dimension Keys
For a specific time period, retrieve the top `N` dimension keys for a metric.
Each response element returns a maximum of 500 bytes. For larger elements, such as SQL statements, only the first 500 bytes are returned.
External Documentation
To learn more, visit the [AWS documentation](https://docs.aws.amazon.com/cli/latest/reference/pi/describe-dimension-keys.html#describe-dimension-keys).
## Basic Parameters
| Parameter | Description |
| ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| AWS Region(s) | Enter the desired AWS Region(s).
To execute the action in multiple regions, provide a comma-separated list.
For example: `us-east-1,eu-west-2`.
If you wish to run the action in all available regions, use the asterisk symbol (`*`) instead. |
| End Time | The date and time specifying the end of the requested time series data.
The value specified is exclusive, which means that data points less than (but not equal to) EndTime are returned.
The value for EndTime must be later than the value for StartTime. |
| Group By | A specification for how to aggregate the data points from a query result.
You must specify a valid dimension group.
Performance Insights returns all dimensions within this group, unless you provide the names of specific dimensions within this group.
You can also request that Performance Insights return a limited number of values for a dimension. |
| Identifier | An immutable, AWS Region-unique identifier for a data source. Performance Insights gathers metrics from this data source.
To use an Amazon RDS instance as a data source, you specify its DbiResourceId value. For example, specify `db-FAIHNTYBKTGAUSUZQYPDS2GW4A`. |
| Metric | The name of a Performance Insights metric to be measured.
Valid values for Metric are:
\* `db.load.avg` - a scaled representation of the number of active sessions for the database engine.
\* `db.sampledload.avg` - the raw number of active sessions for the database engine.
If the number of active sessions is less than an internal Performance Insights threshold, `db.load.avg` and `db.sampledload.avg` are the same value.
If the number of active sessions is greater than the internal threshold, Performance Insights samples the active sessions,
with `db.load.avg` showing the scaled values, `db.sampledload.avg` showing the raw values, and `db.sampledload.avg` less than `db.load.avg`.
For most use cases, you can query `db.load.avg only`. |
| Service Type | The AWS service for which Performance Insights will return metrics.
Valid values are as follows:
\* `RDS`
\* `DOCDB` |
| Start Time | The date and time specifying the beginning of the requested time series data. You must specify a StartTime within the past 7 days.
The value specified is inclusive, which means that data points equal to or greater than StartTime are returned.
The value for StartTime must be earlier than the value for EndTime. |
## Advanced Parameters
| Parameter | Description |
| -------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Disable XML To JSON Auto Convert | When checked, XML responses are not automatically converted into JSON format. |
| Filter | One or more filters to apply in the request.
Restrictions:
\* Any number of filters by the same dimension, as specified in the GroupBy or Partition parameters.
\* A single filter for any other dimension in this dimension group. |
| Max Results | The maximum number of items to return in the response.
If more items exist than the specified MaxRecords value, a pagination token is included in the response so that the remaining results can be retrieved. |
| Next Token | An optional pagination token provided by a previous request.
If this parameter is specified, the response includes only records beyond the token, up to the value specified by MaxRecords. |
| Partition By | For each dimension specified in GroupBy, specify a secondary dimension to further subdivide the partition keys in the response. |
| Period In Seconds | The granularity, in seconds, of the data points returned from Performance Insights.
A period can be as short as one second, or as long as one day (86400 seconds).
Valid values are:
\* 1 (one second)
\* 60 (one minute)
\* 300 (five minutes)
\* 3600 (one hour)
\* 86400 (twenty-four hours)
If you don't specify PeriodInSeconds, then Performance Insights chooses a value for you, with a goal of returning roughly 100-200 data points in the response. |
## Example Output
```json theme={"dark"}
{
"AlignedEndTime": "date-time",
"AlignedStartTime": "date-time",
"Keys": [
{
"Dimensions": {},
"Partitions": [
0
],
"Total": 0
}
],
"NextToken": "[\\s\\S]*",
"PartitionKeys": [
{
"Dimensions": {}
}
]
}
```
## Workflow Library Example
[Query a Performance Report of an Aws Rds Instance](https://library.blinkops.com/workflows/query-a-performance-report-of-an-aws-rds-instance)
Preview this Workflow on desktop