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Copy file name to clipboardExpand all lines: data-explorer/kusto/management/query-acceleration-tsg.md
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@@ -52,17 +52,18 @@ By design, queries over accelerated external tables may return data that lags be
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You can control the effective `MaxAge` in two ways:
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1. Configure the `MaxAge` property in the query acceleration policy using the [`.alter query acceleration policy` command](alter-query-acceleration-policy-command.md).
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2. Override `MaxAge` per query by using the [`external_table()` operator's](../query/external-table-function.md) `MaxAgeOverride` parameter.
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- Configure the `MaxAge` property in the query acceleration policy using the [`.alter query acceleration policy` command](alter-query-acceleration-policy-command.md).
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- Override `MaxAge` per query by using the [`external_table()` operator's](../query/external-table-function.md) `MaxAgeOverride` parameter.
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## Query isn't running fast enough
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This is a performance issue: query is slower than expected, and acceleration doesn't appear to improve performance.
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There are a few reasons why this could happen:
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1. The query acceleration catalog is unusable (out-of-date or never built) - see section [Check if catalog is unusable](#check-if-catalog-is-unusable)
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2. The query scans nonaccelerated data - see section [Check if query is over nonaccelerated data](#check-if-query-is-over-nonaccelerated-data)
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3. The query doesn't comply with KQL best practices - see [KQL best practices](../query/best-practices.md)
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- The query acceleration catalog is unusable (out-of-date or never built) - see section [Check if catalog is unusable](#check-if-catalog-is-unusable)
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- The query scans nonaccelerated data - see section [Check if query is over nonaccelerated data](#check-if-query-is-over-nonaccelerated-data)
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- The query doesn't comply with KQL best practices - see [KQL best practices](../query/best-practices.md)
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## Check if catalog is unusable
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@@ -175,8 +176,8 @@ The following section helps you understand why.
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There are two main reasons why a query might read non-accelerated data:
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1. The query-time filter isn't fully within the query acceleration hot period or hot windows.
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2. The data within the policy hot period isn't fully cached.
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- The query-time filter isn't fully within the query acceleration hot period or hot windows.
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- The data within the policy hot period isn't fully cached.
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#### Query filter isn't fully within the hot period or hot windows
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