In SQL Server, both
sys are schema-based views that provide metadata about database objects. However, there are some differences between the two:
- Content: The
INFORMATION_SCHEMAviews provide a more standardized way of accessing metadata, while the
sysviews provide more detailed information about the database objects.
- Compatibility: The
INFORMATION_SCHEMAviews are part of the SQL standard, so they are more compatible with other database management systems. On the other hand, the
sysviews are specific to SQL Server.
- Customization: The
INFORMATION_SCHEMAviews are read-only, so they cannot be modified. The
sysviews can be customized using user-defined views, stored procedures, and functions.
- Performance: The
sysviews are generally faster than the
INFORMATION_SCHEMAviews, as they use internal system tables that are optimized for performance.
In summary, the
INFORMATION_SCHEMA views provide a more standardized way of accessing metadata, while the
sys views provide more detailed and customizable information specific to SQL Server. Both can be useful in different scenarios, depending on the requirements of the task at hand.