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System Functions

SYSTEM$ESTIMATE_QUERY_ACCELERATION

For a previously executed query, this function returns a JSON object that specifies if the query is eligible to benefit from the query acceleration service. If the query is eligible for query acceleration, the output includes the estimated query execution time for different query acceleration scale factors.

See also:

Using the Query Acceleration Service , QUERY_ACCELERATION_ELIGIBLE View

Syntax

SYSTEM$ESTIMATE_QUERY_ACCELERATION( '<query_id>' )

Parameters

query_id

Query ID. Query ID must be for a query executed within the last 14 days; otherwise, the status is invalid.

Output

The function returns a JSON object with the properties described below:

Property

Description

estimatedQueryTimes

Object that contains the estimated query execution time in seconds for different query acceleration scale factors. If the status for the query is not eligible for query acceleration, this object is empty.

For more details, see the example output below.

originalQueryTime

Execution time of the original query in seconds.

queryUUID

Query ID.

status

One of the following values that indicates whether or not the query is eligible to benefit from the query acceleration service:

eligible

The query can benefit from query acceleration.

ineligible

The query cannot benefit from query acceleration.

accelerated

The query has already been accelerated.

invalid

The query with the specified ID was not found.

upperLimitScaleFactor

Number of the highest query acceleration scale factor in the estimatedQueryTimes object. If the status for the query is not eligible for query acceleration, this field is set to 0.

In the estimatedQueryTimes object, each name / value pair specifies a query acceleration scale factor and the estimated query execution time at that scale factor.

The following example lists the estimated query execution time for the scale factors 1, 10, 2, 4 and 8:

...
"estimatedQueryTimes" : {
  "1" : 171,
  "2": 152,
  "4": 133,
  "8": 120
}
...

Usage Notes

  • Estimated query times are for analysis purposes only and are not guaranteed.

  • Estimated query times are calculated based on the assumption that the query is serviced by all the compute resources allocated by the query acceleration service based on scale factor.

  • Estimated query times do not factor in concurrency.

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