THIS TOPIC APPLIES TO: SQL Server (starting with 2016)Azure SQL DatabaseAzure SQL Data Warehouse Parallel Data Warehouse
This topic describes breaking changes in the SQL Server 2017 Database Engine and earlier versions of SQL Server. These changes might break applications, scripts, or functionalities that are based on earlier versions of SQL Server. You might encounter these issues when you upgrade.
The sample_ms column of sys.dm_io_virtual_file_stats has expanded from an int to a bigint data type.
The TimeStamp column of sys.fn_virtualfilestats has expanded from an int to a bigint data type.
Using the MD2, MD4, MD5, SHA, or SHA1 hash algorithms (not recommended) requires setting the database compatibility level to earlier than 130.
Under database compatibility level 130, implicit conversions from datetime to datetime2 data types show improved accuracy by accounting for the fractional milliseconds, resulting in different converted values. Use explicit casting to datetime2 datatype whenever a mixed comparison scenario between datetime and datetime2 datatypes exists.
Deprecated Database Engine Features in SQL Server 2016
Discontinued Database Engine Functionality in SQL Server 2016
SQL Server Database Engine Backward Compatibility
ALTER DATABASE Compatibility Level (Transact-SQL)