Is there any data loss if a table is being altered to change an existing column from varbinary(8000) to varbinary(MAX)?
migrated from serverfault.com Mar 26 at 15:32
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No, you won't lose data.
SQL Server will do an in place conversion, as a transaction. This means if anything fails, it will rollback.
Note, this is more than a simple metadata change so it may take some time because data has to be moved around