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You have two options for authentication: access keys and [Microsoft Entra Authentication](entra-for-authentication.md). Using Microsoft Entra Authentication is recommended because it is more secure.
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You have two options for authentication: access keys and [Microsoft Entra Authentication](entra-for-authentication.md). Using Microsoft Entra Authentication is recommended because it's more secure.
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#### [Access keys](#tab/access-keys)
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### Advanced settings
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The following settings are configured on the **Advanced settings** on the left.
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The following properties are set:
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- Non-TLS access only
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- Eviction Policy
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- Defer Redis DB version updates
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### Data persistence (preview)
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**Data persistence**allows you to enable, disable, or configure data persistence for your Redis instance. Azure Managed Redis offers Redis persistence using either RDB persistence or AOF persistence.
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Use **Data persistence** to enable, disable, or configure data persistence for your Redis cache. Azures Managed Redis offers Redis persistence using either RDB persistence or AOF persistence.
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For more information, see [Configure data persistence for an Azure Managed Redis instance](how-to-persistence.md).
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### Resource health
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**Resource health** watches your resource and tells you if it's running as expected. Resource health is not yet supported for Azure Managed Redis.
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**Resource health** watches your resource and tells you if it's running as expected. Resource health isn't yet supported for Azure Managed Redis.
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For more information about the Azure Resource health service, see [Azure Resource health overview](/azure/service-health/resource-health-overview).
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### Support and Troubleshooting
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## Other configuration information
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Here's some additional information about Azure Managed Redis caches.
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### Databases
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Currently, Azure Managed Redis only supports a single database per instance.
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See the [Azure Managed Redis pricing page](https://aka.ms/amrpricing) for more information about the connection limits per SKU.
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> [!NOTE]
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> While each size of cache allows *up to*a certain number of connections, each connection to Redis has overhead associated with it. An example of such overhead would be CPU and memory usage as a result of TLS/SSL encryption. The maximum connection limit for a given cache size assumes a lightly loaded cache. If load from connection overhead *plus* load from client operations exceeds capacity for the system, the cache can experience capacity issues even if you have not exceeded the connection limit for the current cache size.
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> Each cache size allows *up to*some number connections, but each connection adds overhead. Examples of such overhead include CPU and memory usage due to TLS/SSL encryption. The maximum connection limit for a cache size assumes a lightly loaded cache. If the load from connection overhead *plus*the load from client operations exceeds the system's capacity, the cache might encounter capacity issues even without exceeding the connection limit for the current cache size.
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>
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### Redis commands not supported in Azure Managed Redis
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Configuration and management of Azure Managed Redis instances is managed by Microsoft, which disables several commands in order to ensure safe and consistent operation of the service.
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If you try to invoke them, you receive an error message similar to `"(error) ERR unknown command"`.
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Microsoft manages the configuration and management of Azure Managed Redis instances, which disables several commands in order to ensure safe and consistent operation of the service.
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If you try to invoke a disabled command, you receive an error message similar to `"(error) ERR unknown command"`.
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Blocked commands include:
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- MOVE
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- PSYNC
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- REPLICAOF
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- REPLCONF - Azure Managed Redis instances don't allow customers to add external replicas. This [command](https://redis.io/commands/replconf/) is normally only sent by servers.
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- REPLCONF - Azure Managed Redis instances don't allow customers to add external replicas. Normally, only servers send this command.
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