[](https://help.qlik.com/talend/en-US/talend-data-catalog/Content/deployment-guide/index.htm) # How Much Server Does TDC Need, and Where Can It Run? The Deployment Guide is for administrators and platform engineers who install, size, and maintain TDC. It covers the application server, the repository database (PostgreSQL, Microsoft SQL Server, or Oracle), Solr indexing, metadata harvesting setup, SSL and authentication, backup, upgrade, and migration. When you're done, you can stand up a server on Linux or Windows, connect it to a supported database, and run harvesting agents on premises while the server runs in the cloud. Information note Some of the features detailed in this document may not apply and/or be available for the particular edition/version you are using. ## Get started * [Review the deployment architecture](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/deployment-architecture-diagrams/deployment-architecture-overview.htm) * [Check application server requirements](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/application-server-requirements.htm) * [Set up the repository database](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/database-server-setup/index.htm) * [Install and configure the application server](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/server-installation-and-configuration.htm) * [Start the bundled Solr indexing server](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/solr-indexing-server-setup/setting-up-the-bundled-solr-indexing-server.htm) * [Upgrade an existing application server](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/application-server-upgrade.htm) ## Frequently asked questions ### What are the minimum hardware requirements for TDC? The application server's minimum is a 2 GHz quad-core processor, 8 GB of RAM, and 10 GB of disk. That covers the tutorial and small use cases only. For enterprise use, the guide's capacity planning model (200 light and 100 heavy users) recommends at least 64 cores and 300 GB of memory. See [Application Server Requirements](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/application-server-requirements.htm). ### Which operating systems does the application server support? Most popular 64-bit Linux distributions, such as Red Hat, and Microsoft-supported 64-bit Windows, including Windows Server 2012, 2016, 2019, and 2022. Support follows the bundled Java runtime and Tomcat. On headless Linux, install fontconfig so diagrams render. Windows installs need administrator rights and .NET Framework 3.5 or later. See [Application Server Requirements](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/application-server-requirements.htm). ### Does TDC support PostgreSQL, SQL Server, and Oracle? Yes. The repository database can run on PostgreSQL, Oracle, or Microsoft SQL Server, on premises or in the cloud. The database server minimum is four cores, 8 GB of RAM, and 20 GB of disk, and setup needs database administrator privileges. For small deployments and proofs of concept, the Windows package bundles PostgreSQL on the same machine as the application server. See [repository database setup](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/database-server-setup/index.htm). ### How do I migrate the repository database to another database platform? Use the migration option in the Setup utility. Clean up old model versions, create an empty database on the new platform, stop the application server, run `Setup -dm` with the new connection details, then restart. Changing the connection string alone isn't supported. Moves within one platform use that platform's backup and restore. See [database platform migration](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/database-server-conversion-migration/index.htm). ### How do I harvest on-premises sources from a cloud-hosted server? Install as a remote harvesting agent on a machine that can reach your sources, then set `M_SERVER_URL` and `M_AGENT_NAME` in `agent.properties` so it connects to the application server. The same setup lets a Linux server use Windows-only bridges, such as those built on COM-based SDKs. See [remote harvesting agent setup](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/metadata-harvesting-model-bridge-mimb-setup/index.htm). ### Do I need to install Solr separately? A new install needs no setup. When the shared metadata repository is empty, TDC starts the bundled Solr indexing server automatically on the same Tomcat server and stores the index under `$MM_HOME/data/solr`. The guide also covers running an external Solr server and migrating to it from bundled Solr or legacy Lucene index files. See [Setting up the Bundled Solr Indexing Server](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/solr-indexing-server-setup/setting-up-the-bundled-solr-indexing-server.htm). ### What should I check before upgrading the application server? Back up the installation and the repository database, and make sure the database has at least 20% free space. Delete unused configurations and old model versions, test every model import against the new bridges, and plan full re-imports. Then follow the 13-step procedure, and don't run anything else against TDC during the automatic migration. See [Application Server Upgrade](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/deployment-guide/mm-application-server-setup/application-server-upgrade.htm). ## Related documentation Return to the TDC documentation home. For bridge coverage and known limits, see the [Talend Data Catalog bridge documentation](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/mimb-guide/index.htm); for release notes and current patches before an upgrade, see [Releases & Roadmap](https://help.qlik.com/talend/en-US/talend-data-catalog/9.0/Content/releases-and-roadmap/index.htm).