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    <p>From my experience that suggests that migration table is out of sync (even if your data isn't), and that's been part of the db schema now (since 4.3 I think - under system tables). </p> <p>There could be many reasons and ways to experience that error , but most of the time... </p> <p>The problematic part is some combination of manually backing/restoring the full database with code changes alongside - I'm not entirely certain as to why always. </p> <p>In short, even if Db-s are the same migration table data might not be - and hash comparison may fail (still full restore sounds like good enough - but you have 'two sides'). </p> <hr> <p>What works for me is to use<br> <code>Update-Database -Script</code> </p> <p>That creates a script with a 'migration difference',<br> which you can manually apply as an SQL script on the target server database (and you should get the right migration table rows inserted etc.). </p> <p>If that still doesn't work - you can still do two things... </p> <ol> <li><p>Remove the migration table (target - under system tables) - as per <a href="http://blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-automatic-migrations-walkthrough.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-automatic-migrations-walkthrough.aspx</a> comments in there - that should fail back to previous behavior and if you're certain that your Db-s are the same - it's just going to 'trust you', </p></li> <li><p>As a last resort I used - make a <code>Update-Database -Script</code> of the full schema (e.g. by initializing an empty db which should force a 'full script'),<br> find the <code>INSERT INTO [__MigrationHistory]</code> records,<br> just run those, insert them into the database,<br> and make sure that your databases - and code match,</p></li> </ol> <p>that should make things run in sync again. </p> <p>(disclaimer: this is not a bullet proof to work at all times, you may need to try a few things given your local scenarios - but should get you in sync)</p>
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    1. POMVC3 and Code First Migrations - "model backing the 'blah' context has changed since the database was created"
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    1. CO'Update-Database -Script' worked. I would have thought that the 'Update-Database' command would have done the same thing (but without generating a script). Anyway. Thanks!
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      1. USScott Dietrich
    2. CO@ScottDietrich - np - well, it should, but you have to keep things in sync on all sides (and e.g. migrations generate based on the 'status' of the local db etc. - so migration is made to fit your 'local' db vs code - once you start 'moving things out' there is more chance you did something wrong). All in all, SQL scripts turned out to be safer way, you can see exactly - unless you have a dev setup on the server too (to be able to run migrations there 'in place')
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