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Copy file name to clipboardExpand all lines: content/develop/interact/search-and-query/administration/configuration.md
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- oss
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- kubernetes
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- clients
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description: 'Redis Query Engine can be tuned through multiple
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configuration parameters. Some of these parameters can only be set at load-time,
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while other parameters can be set either at load-time or at run-time.'
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description: Redis Query Engine can be tuned through multiple configuration parameters. Some of these parameters can only be set at load-time, while other parameters can be set either at load-time or at run-time.
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linkTitle: Configuration parameters
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title: Configuration parameters
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weight: 1
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---
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{{< note >}}
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As of Redis Community Edition (CE) 8.0, configuration parameters for the time series data structure are now set in the following ways:
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As of Redis Community Edition (CE) 8.0, configuration parameters for Redis Query Engine (RQE) are now set in the following ways:
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* At load time via your `redis.conf` file.
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* At run time (where applicable) using the [`CONFIG SET`]({{< relref "/commands/config-set" >}}) command.
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Also, CE 8.0 persists probabilistic configuration parameters just like any other configuration parameters (e.g., using the [`CONFIG REWRITE`]({{< relref "/commands/config-rewrite/" >}}) command).
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Also, CE 8.0 persists RQE configuration parameters just like any other configuration parameters (for example, using the [`CONFIG REWRITE`]({{< relref "/commands/config-rewrite/" >}}) command).
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{{< /note >}}
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## Redis Query Engine configuration parameters
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## RQE configuration parameters
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The following table summarizes which configuration parameters can be set at run-time, and compatibility with Redis Software and Redis Cloud.
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Added in v2.10.8.
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The maximum number of cursors that can be opened, per shard, at any given time. Cursors can be opened by the user via [`FT.AGGREGATE WITHCURSOR`]({{< relref "/commands/ft.aggregate/" >}}). Cursors are also opened internally by the Redis Query Engine for long-running queries. Once `INDEX_CURSOR_LIMIT` is reached, any further attempts to open a cursor will result in an error.
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The maximum number of cursors that can be opened, per shard, at any given time. Cursors can be opened by the user via [`FT.AGGREGATE WITHCURSOR`]({{< relref "/commands/ft.aggregate/" >}}). Cursors are also opened internally by the RQE for long-running queries. Once `INDEX_CURSOR_LIMIT` is reached, any further attempts to open a cursor will result in an error.
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{{% alert title="Notes" color="info" %}}
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* Caution should be used in modifying this parameter. Every open cursor results in additional memory usage.
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### search-min-prefix
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The minimum number of characters allowed for prefix queries (e.g., hel*). Setting it to `1` can reduce performance.
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The minimum number of characters allowed for prefix queries (for example, hel*). Setting it to `1` can reduce performance.
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Type: integer
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### search-no-mem-pools
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Set Redis Query Engine to run without memory pools.
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Set RQE to run without memory pools.
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Type: boolean
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### search-upgrade-index
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Relevant only when loading an v1.x RDB file. Specify the argument for upgrading the index.
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This configuration setting is a special configuration option introduced to upgrade indexes from v1.x Redis Query Engine versions, otherwise known as legacy indexes. This configuration option needs to be given for each legacy index, followed by the index name and all valid options for the index description (also referred to as the `ON` arguments for following hashes) as described on [FT.CREATE]({{< relref "/commands/ft.create/" >}}) command page.
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This configuration setting is a special configuration option introduced to upgrade indexes from v1.x RQE versions, otherwise known as legacy indexes. This configuration option needs to be given for each legacy index, followed by the index name and all valid options for the index description (also referred to as the `ON` arguments for following hashes) as described on [FT.CREATE]({{< relref "/commands/ft.create/" >}}) command page.
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