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.alter materialized-view policy caching command

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Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer

Changes the materialized view's cache policy. To speed up queries, data is cached on processing nodes, SSD, or even in RAM. The cache policy allows your database to describe the data artifacts that it uses, so that more important data can take priority.

Permissions

You must have at least Table Admin permissions to run this command.

Syntax

.alter materialized-view MaterializedViewName policy caching PolicyParameters

Learn more about syntax conventions.

Parameters

Name Type Required Description
MaterializedViewName string ✔️ The name of the materialized view.
PolicyParameters string ✔️ One or more policy parameters. For parameters, see cache policy.

Examples

Set the caching policy to include the last 30 days.

.alter materialized-view MyMaterializedView policy caching hot = 30d

Set the caching policy to include the last 30 days and data from January and April 2021.

.alter materialized-view MyMaterializedView policy caching 
        hot = 30d,
        hot_window = datetime(2021-01-01) .. datetime(2021-02-01),
        hot_window = datetime(2021-04-01) .. datetime(2021-05-01)