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Question 87/105
You develop a Universal Windows Platform (UWP) application for Windows 10 Internet of Things (IoT) Core. The application uses Entity Framework Core and a SQLite database to store data.
You use the SQLite EF Core database provider to migrate data from an on-premises database to SQLite.
The migration process throws an exception.
You need to resolve the exception.
What are two possible ways to achieve this goal? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
You use the SQLite EF Core database provider to migrate data from an on-premises database to SQLite.
The migration process throws an exception.
You need to resolve the exception.
What are two possible ways to achieve this goal? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
Correct Answer: A,D
Explanation/Reference:
Explanation:
A: The common relational library (shared by Entity Framework relational database providers) defines APIs for modelling concepts that are common to most relational database engines. A couple of these concepts are not supported by the SQLite provider: Schemas, Sequences, Computed columns.
The SQLite database engine does not support a number of schema operations that are supported by the majority of other relational databases. If you attempt to apply one of the unsupported operations to a SQLite database then a NotSupportedException will be thrown.
D: SQLite allows multiple processes to have the database file open at once, and for multiple processes to read the database at once. When any process wants to write, it must lock the entire database file for the duration of its update.
References:
https://docs.microsoft.com/en-us/ef/core/providers/sqlite/limitations
Explanation:
A: The common relational library (shared by Entity Framework relational database providers) defines APIs for modelling concepts that are common to most relational database engines. A couple of these concepts are not supported by the SQLite provider: Schemas, Sequences, Computed columns.
The SQLite database engine does not support a number of schema operations that are supported by the majority of other relational databases. If you attempt to apply one of the unsupported operations to a SQLite database then a NotSupportedException will be thrown.
D: SQLite allows multiple processes to have the database file open at once, and for multiple processes to read the database at once. When any process wants to write, it must lock the entire database file for the duration of its update.
References:
https://docs.microsoft.com/en-us/ef/core/providers/sqlite/limitations
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