Breaking Changes to Database Engine Features in SQL Server 2016
APPLIES TO: SQL Server (starting with 2016) Azure SQL Database Azure 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.
Breaking Changes in SQL Server 2016 (13.x)
The sample_ms column of
sys.dm_io_virtual_file_statshas expanded from an int to a bigint data type.
The TimeStamp column of
sys.fn_virtualfilestatshas expanded from an int to a bigint data type.
The MD2, MD4, MD5, SHA, and SHA1 algorithms are not available under compatibility level 130. Using the MD2, MD4, MD5, SHA, or SHA1 hash algorithm is not recommended, but can be done by setting the database compatibility level to a value lower 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. For more information, see this Microsoft Support Article.
Under database compatibility level 130, operations that perform implicit conversions between certain numeric and datetime data types show improved accuracy and can result in different converted values. This includes usage of functions that require calculations such as, for example,
ROUND. For more information, see this Microsoft Support Article.
For information about breaking changes in SQL Server 2014 (12.x), and in some earlier versions, see Breaking Changes to Database Engine Features in SQL Server 2014.
Archived Documentation for Very Old Versions of SQL Server
We accumulate and retain documentation for very old versions of SQL Server in a set of archive webpages. You can see these archives at SQL Server previous versions documentation.
As of November 2018, these archives include the documentation for at least the following:
- SQL Server 2012
- SQL Server 2008 R2
- SQL Server 2008
- SQL Server 2005
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)
SQL Server 2016 or SQL Server 2017 on Windows improvements in handling some data types and uncommon operations