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articles/azure-cache-for-redis/cache-overview.md

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Azure Cache for Redis provides an in-memory data store based on the [Redis](https://redis.io/) software. Redis improves the performance and scalability of an application that uses backend data stores heavily. It's able to process large volumes of application requests by keeping frequently accessed data in the server memory, which can be written to and read from quickly. Redis brings a critical low-latency and high-throughput data storage solution to modern applications.
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Azure Cache for Redis offers both the Redis open-source (OSS Redis) and a commercial product from Redis Labs (Redis Enterprise) as a managed service. It provides secure and dedicated Redis server instances and full Redis API compatibility. The service is operated by Microsoft, hosted on Azure, and usable by any application within or outside of Azure.
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Azure Cache for Redis offers both the Redis open-source (OSS Redis) and a commercial product from Redis Inc. (Redis Enterprise) as a managed service. It provides secure and dedicated Redis server instances and full Redis API compatibility. The service is operated by Microsoft, hosted on Azure, and usable by any application within or outside of Azure.
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Azure Cache for Redis can be used as a distributed data or content cache, a session store, a message broker, and more. It can be deployed as a standalone. Or, it can be deployed along with other Azure database services, such as Azure SQL or Cosmos DB.
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| Basic | An OSS Redis cache running on a single VM. This tier has no service-level agreement (SLA) and is ideal for development/test and non-critical workloads. |
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| Standard | An OSS Redis cache running on two VMs in a replicated configuration. |
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| Premium | High-performance OSS Redis caches. This tier offers higher throughput, lower latency, better availability, and more features. Premium caches are deployed on more powerful VMs compared to the VMs for Basic or Standard caches. |
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| Enterprise | High-performance caches powered by Redis Labs' Redis Enterprise software. This tier supports Redis modules including RediSearch, RedisBloom, and RedisTimeSeries. Also, it offers even higher availability than the Premium tier. |
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| Enterprise Flash | Cost-effective large caches powered by Redis Labs' Redis Enterprise software. This tier extends Redis data storage to non-volatile memory, which is cheaper than DRAM, on a VM. It reduces the overall per-GB memory cost. |
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| Enterprise | High-performance caches powered by Redis Inc.'s Redis Enterprise software. This tier supports Redis modules including RediSearch, RedisBloom, and RedisTimeSeries. Also, it offers even higher availability than the Premium tier. |
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| Enterprise Flash | Cost-effective large caches powered by Redis Inc.'s Redis Enterprise software. This tier extends Redis data storage to non-volatile memory, which is cheaper than DRAM, on a VM. It reduces the overall per-GB memory cost. |
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### Feature comparison
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- **High availability**: Azure Cache for Redis provides multiple [high availability](cache-high-availability.md) options. It guarantees that a Standard, Premium, or Enterprise cache is available according to our [SLA](https://azure.microsoft.com/support/legal/sla/cache/v1_0/). The SLA only covers connectivity to the cache endpoints. The SLA doesn't cover protection from data loss. We recommend using the Redis data persistence feature in the Premium and Enterprise tiers to increase resiliency against data loss.
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- **Data persistence**: The Premium and Enterprise tiers allow you to persist the cache data to an Azure Storage account and a Managed Disk respectively. Underlying infrastructure issues might result in potential data loss. We recommend using the Redis data persistence feature in these tiers to increase resiliency against data loss. Azure Cache for Redis offers both RDB and AOF (preview) options. Data persistence can be enabled through Azure portal and CLI. For the Premium tier, see [How to configure persistence for a Premium Azure Cache for Redis](cache-how-to-premium-persistence.md).
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- **Network isolation**: Azure Private Link and Virtual Network (VNET) deployments provide enhanced security and traffic isolation for your Azure Cache for Redis. VNET allows you to further restrict access through network access control policies. For more information, see [Azure Cache for Redis with Azure Private Link](cache-private-link.md) and [How to configure Virtual Network support for a Premium Azure Cache for Redis](cache-how-to-premium-vnet.md).
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- **Redis Modules**: Enterprise tiers support [RediSearch](https://docs.redislabs.com/latest/modules/redisearch/), [RedisBloom](https://docs.redislabs.com/latest/modules/redisbloom/) and [RedisTimeSeries](https://docs.redislabs.com/latest/modules/redistimeseries/). These modules add new data types and functionality to Redis.
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- **Redis Modules**: Enterprise tiers support [RediSearch](https://docs.redis.com/latest/modules/redisearch/), [RedisBloom](https://docs.redis.com/latest/modules/redisbloom/) and [RedisTimeSeries](https://docs.redis.com/latest/modules/redistimeseries/). These modules add new data types and functionality to Redis.
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You can scale your cache from the Basic tier up to Premium after it has been created. Scaling down to a lower tier isn't supported currently. For step-by-step scaling instructions, see [How to Scale Azure Cache for Redis](cache-how-to-scale.md) and [How to automate a scaling operation](cache-how-to-scale.md#how-to-automate-a-scaling-operation).
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### Special considerations for Enterprise tiers
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The Enterprise tiers rely on Redis Enterprise, a commercial variant of Redis from Redis Labs. Customers obtain and pay for a license to this software through an Azure Marketplace offer. Azure Cache for Redis manages the license acquisition so that you won't have to do it separately. To purchase in the Azure Marketplace, you must have the following prerequisites:
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The Enterprise tiers rely on Redis Enterprise, a commercial variant of Redis from Redis Inc. Customers obtain and pay for a license to this software through an Azure Marketplace offer. Azure Cache for Redis manages the license acquisition so that you won't have to do it separately. To purchase in the Azure Marketplace, you must have the following prerequisites:
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- Your Azure subscription has a valid payment instrument. Azure credits or free MSDN subscriptions aren't supported.
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- Your organization allows [Azure Marketplace purchases](../cost-management-billing/manage/ea-azure-marketplace.md#enabling-azure-marketplace-purchases).
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- If you use a private Marketplace, it must contain the Redis Labs Enterprise offer.
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- If you use a private Marketplace, it must contain the Redis Inc. Enterprise offer.
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> [!IMPORTANT]
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> Azure Cache for Redis Enterprise requires standard network Load Balancers that are charged separately from cache instances themselves. For more information, see [Load Balancer pricing](https://azure.microsoft.com/pricing/details/load-balancer/).

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