.alter cluster cache policy
Change the cluster cache policy. To speed up queries on data, Azure Data Explorer caches data on its processing nodes, SSD, or even in RAM. With the cache policy, Azure Data Explorer can describe data artifacts so that important data can take priority.
Syntax
.alter cluster policy caching PolicyParameter
Arguments
PolicyParameter - Define one or more policy parameters. For parameters, see cache policy.
Returns
Returns a JSON representation of the policy.
Example
The following example sets the caching policy to include the last 30 days.
.alter cluster policy caching hot = 30d
Output
| PolicyName | EntityName | Policy | ChildEntities | EntityType |
|---|---|---|---|---|
| CachingPolicy | {"DataHotSpan": { "Value": "30.00:00:00" }, "IndexHotSpan": { "Value": "30.00:00:00"}} |
Define hot-cache windows
This command sets the caching policy to include the last 30 days and additional data from January and April 2021.
.alter cluster policy caching
hot = 30d,
hot_window = datetime(2021-01-01) .. datetime(2021-02-01),
hot_window = datetime(2021-04-01) .. datetime(2021-05-01)
Output
| PolicyName | EntityName | Policy | ChildEntities | EntityType |
|---|---|---|---|---|
| CachingPolicy | {"DataHotSpan": { "Value": "30.00:00:00" }, "IndexHotSpan": { "Value": "30.00:00:00" },"HotWindows": [{ "MinValue": "2021-01-01T00:00:00Z", "MaxValue": "2021-02-01T00:00:00Z" }, { "MinValue": "2021-04-01T00:00:00Z", "MaxValue": "2021-05-01T00:00:00Z" }]} |