The emulator does not offer different Azure Cosmos DB consistency levels like the cloud service does.
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For more information on how to change this value, see Set the PartitionCount value article. When using the Azure Cosmos DB Emulator, by default, you can create up to 25 fixed size containers at 400 RU/s (only supported using Azure Cosmos DB SDKs), or 5 unlimited containers. The emulator is not a scalable service and it doesn't support a large number of containers. With the emulator, you can create an Azure Cosmos account in provisioned throughput mode only currently it doesn't support serverless mode. You can't regenerate key when using the Azure Cosmos DB Emulator, however you can change the default key by using the command-line option. The emulator supports only a single fixed account and a well-known primary key. The Data Explorer view and operations for Azure Cosmos DB APIs such as MongoDB, Table, Graph, and Cassandra APIs are not fully supported. Differences between the emulator and the cloud serviceīecause the Azure Cosmos DB Emulator provides an emulated environment that runs on the local developer workstation, there are some differences in functionality between the emulator and an Azure Cosmos account in the cloud:Ĭurrently the Data Explorer pane in the emulator fully supports SQL API clients only. You can migrate data between the Azure Cosmos DB Emulator and the Azure Cosmos DB service by using the Azure Cosmos DB Data Migration Tool. Functionality that relies on the Azure infrastructure like global replication, single-digit millisecond latency for reads/writes, and tunable consistency levels are not applicable when you use the emulator. For example, the emulator uses standard OS components such as the local file system for persistence, and the HTTPS protocol stack for connectivity. While emulation of the Azure Cosmos DB service is faithful, the emulator's implementation is different than the service.
You can develop and test applications using the Azure Cosmos DB Emulator, and deploy them to Azure at global scale by updating the Azure Cosmos DB connection endpoint. It supports equivalent functionality as the Azure Cosmos DB, which includes creating data, querying data, provisioning and scaling containers, and executing stored procedures and triggers. The Azure Cosmos DB Emulator provides a high-fidelity emulation of the Azure Cosmos DB service. To learn more, see how to connect to the emulator endpoint from different APIs. Currently the data explorer in the emulator fully supports viewing SQL data only the data created using MongoDB, Gremlin/Graph and Cassandra client applications it is not viewable at this time. You can develop applications using Azure Cosmos DB Emulator with the SQL, Cassandra, MongoDB, Gremlin, and Table API accounts. The emulator release notes article lists all the available versions and the feature updates that were made in each release.
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To get started, download and install the latest version of Azure Cosmos DB Emulator on your local computer.
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This article describes how to install and use the emulator on Windows, Linux, macOS, and Windows docker environments. When you're satisfied with how your application is working in the Azure Cosmos DB Emulator, you can switch to using an Azure Cosmos account in the cloud. Using the Azure Cosmos DB Emulator, you can develop and test your application locally, without creating an Azure subscription or incurring any costs. The Azure Cosmos DB Emulator provides a local environment that emulates the Azure Cosmos DB service for development purposes.
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