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SQL Server executes the query/proc after the TVP temp table is loaded and the parameterized T-SQL query/proc can then use the TVP data.

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.

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This memory adds up very quickly when many rows and lob columns are passed via a TVP with a trace running.

For example, the 10,000 row TVP with 10 LOB columns used in the earlier test required over 800MB memory for a single trace record.

When tracing TVP RPC completed events, monitor the OBJECTSTORE_LBSS memory pool for excessive memory usage.

Acknowledgements I’d like the thank SQL Server MVP Ola Hallengren for his suggestion for me to write this article.

SQL Server prepares to receive TVP data up to the max length specified by the client application rather than the defined size of the target table type column.

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.All tests used the same table type of 10 varchar(50) columns and a 10,000 row TVP rows passed via a Data Table object of 10 string columns.The only variables were the max column length specified by the app code and a trace running on the database server.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.LOB values are especially problematic when a trace captures the RPC completed event of a TVP query.Table-valued parameters have important considerations that developers and DBAs need to be aware of.

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