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Explore our newest dashboard of the Americas region. It offers a comprehensive and targeted view of mobility data across the continent to support the implementation of the Los Angeles Declaration on Migration and Protection.
Explore international, publicly available and internationally comparable migration data on our interactive world map. Data is available on a variety of topics, including immigration and emigration, public opinion and migrant integration. All data is from international sources, such as UN DESA and UNICEF.
Migration is a cross-cutting issue in the 2030 Agenda, relevant to all of the Sustainable Development Goals (SDGs). Spin the wheel to explore how each SDG relates to migration and learn more about migration-relevant data for each.
This spotlight section contextualizes publicly available data to understand the various mobility dimensions of the crisis in Sudan since 15 April. The section also provides the most recent data on different vulnerable groups on the move and latest information on migration policies and humanitarian responses.
IOM's Displacement Tracking Matrix (DTM) is a system for collecting and analysing data to disseminate important multi-layered information about the mobility, vulnerabilities, and needs of displaced and mobile populations.
Overview of key global mobility figures, including international migrants, labour migrants, remittances, missing migrants, refugees, internal displacement, and more. Also available as PDF.
The boundaries and names shown and the designations used on this map do not imply official endorsement or acceptance by the United Nations or the International Organization for Migration (IOM). (More)
In real world projects, data models change as features get implemented: new entities or properties are added and removed, and database schemas need to be changed accordingly to be kept in sync with the application. The migrations feature in EF Core provides a way to incrementally update the database schema to keep it in sync with the application's data model while preserving existing data in the database.
During development, you may have used the Create and Drop APIs to iterate quickly, changing your model as needed; but now that your application is going to production, you need a way to safely evolve the schema without dropping the entire database.
EF Core will create a directory called Migrations in your project, and generate some files. It's a good idea to inspect what exactly EF Core generated - and possibly amend it - but we'll skip over that for now.
That's all there is to it - your application is ready to run on your new database, and you didn't need to write a single line of SQL. Note that this way of applying migrations is ideal for local development, but is less suitable for production environments - see the Applying Migrations page for more info.
Since this isn't the project's first migration, EF Core now compares your updated model against a snapshot of the old model, before the column was added; the model snapshot is one of the files generated by EF Core when you add a migration, and is checked into source control. Based on that comparison, EF Core detects that a column has been added, and adds the appropriate migration.
Note that this time, EF detects that the database already exists. In addition, when our first migration was applied above, this fact was recorded in a special migrations history table in your database; this allows EF to automatically apply only the new migration.
The above was only a brief introduction to migrations. Please consult the other documentation pages to learn more about managing migrations, applying them, and other aspects. The .NET Core CLI tool reference also contains useful information on the different commands
The global compact for migration is the first, intergovernmentally negotiated agreement, prepared under the auspices of the United Nations, to cover all dimensions of international migration in a holistic and comprehensive manner.
The process to develop this global compact started in April 2017. The pages in this section detail 18 months of consultation and negotiation, and provide the relevant documentation for each of the events.
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