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When the specified max length of variable length columns exceed the 8000 byte tipping point, SQL Server uses a different code path to allow for large object (LOB) values up to 2GB.
Unless the table type actually contains LOB values (varchar(MAX), nvarchar(MAX)), database server resources are wasted unnecessarily when an inappropriate max column length is specified.
Generally, when you use replication and a GUID pk, you can make them the same column.
Table-valued parameters have important considerations that developers and DBAs need to be aware of.
SQL Server uses the provided column meta-data to prepare and fill buffers for efficient processing on the server side, leveraging native types to eliminate parsing overhead similarly to other parameterized queries.
Before a query or stored proc with a TVP starts executing, SQL Server creates a table in tempdb with the same schema as the parameter table type and uses bulk insert internally to efficiently load the table with TVP rows streamed by the client application.
The TVP columns provided by the client application do not have to match the schema of the target table type; SQL Server implicitly converts TVP values to match the target table type column when data types differ.
Although not optimal, implicit conversion is generally not a major factor in overall TVP performance.
With scalar parameters, one need only specify the correct Sql Db Type along with the proper length, precision/scale (avoiding Add With Value method to add parameters) and all is well in the world. These objects inherently contain column meta-data and methods enumerate rows, which the Sql Client API uses to send the TVP to SQL Server.From my observations of the sys.dm_os_memory_clerks DMV, .This memory adds up very quickly when many rows and lob columns are passed via a TVP with a trace running.It is essential that application code specify the proper data type and length for TVP columns in order to achieve optimal performance and reduce unnecessary overhead.Additionally, a trace (Extended Events, server-side SQL Trace, Profiler) that captures RPC events of an inappropriately defined TVP can not only exacerbate performance issues, but affect stability of the SQL Server instance in some cases.
But unlike Db Data Reader and IEnumerable objects, a big gotcha with a Data Table is that the default data type String with maximum length of -1 (2GB LOB). NET equivalent of the SQL Server nvarchar(MAX) data type and has many insidious and negative implications with a TVP.