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Add json and vector data types to unsupported list (#35644)
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‎docs/relational-databases/in-memory-oltp/supported-data-types-for-in-memory-oltp.md‎

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---
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title: "Supported Data Types for In-Memory OLTP"
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title: Supported Data Types for In-Memory OLTP
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description: Learn about data types that are unsupported for the In-Memory OLTP features memory-optimized tables and natively compiled T-SQL modules.
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author: MikeRayMSFT
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ms.author: mikeray
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ms.date: "06/19/2017"
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ms.reviewer: randolphwest
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ms.date: 10/27/2025
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ms.service: sql
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ms.subservice: in-memory-oltp
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ms.topic: conceptual
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monikerRange: "=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current"
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monikerRange: "=azuresqldb-current || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current"
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---
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# Supported Data Types for In-Memory OLTP
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# Supported data types for In-Memory OLTP
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[!INCLUDE [SQL Server Azure SQL Database Azure SQL Managed Instance](../../includes/applies-to-version/sql-asdb-asdbmi.md)]
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This article lists the data types that are unsupported for the In-Memory OLTP features of:
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- Memory-optimized tables
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- Natively compiled T-SQL modules
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## Unsupported Data Types
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The following data types are not supported:
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:::row:::
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:::column:::
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[datetimeoffset (Transact-SQL)](../../t-sql/data-types/datetimeoffset-transact-sql.md)
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[hierarchyid (Transact-SQL)](../../t-sql/data-types/hierarchyid-data-type-method-reference.md)
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[sql_variant (Transact-SQL)](../../t-sql/data-types/sql-variant-transact-sql.md)
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:::column-end:::
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:::column:::
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[geography (Transact-SQL)](../../t-sql/spatial-geography/spatial-types-geography.md)
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[rowversion (Transact-SQL)](../../t-sql/data-types/rowversion-transact-sql.md)
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User-Defined Types
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:::column-end:::
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:::column:::
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[geometry (Transact-SQL)](../../t-sql/spatial-geometry/spatial-types-geometry-transact-sql.md)
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[xml (Transact-SQL)](../../t-sql/xml/xml-transact-sql.md)
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:::column-end:::
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:::row-end:::
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## Notable Supported Data Types
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Most data types are supported by the features of In-Memory OLTP. The following few are worth noting explicitly:
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|String and Binary Types|For more information|
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|-----------------------------|--------------------------|
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|binary and varbinary*|[binary and varbinary (Transact-SQL)](../../t-sql/data-types/binary-and-varbinary-transact-sql.md)|
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|char and varchar*|[char and varchar (Transact-SQL)](../../t-sql/data-types/char-and-varchar-transact-sql.md)|
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|nchar and nvarchar*|[nchar and nvarchar (Transact-SQL)](../../t-sql/data-types/nchar-and-nvarchar-transact-sql.md)|
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For the preceding string and binary data types, starting with SQL Server 2016:
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- An individual memory-optimized table can also have several long columns such as `nvarchar(4000)`, even though their lengths would add to more than the physical row size of 8060 bytes.
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- A memory-optimized table can have max length string and binary columns of data types such as `varchar(max)`.
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This article lists the data types that are unsupported for the In-Memory OLTP features of:
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- Memory-optimized tables
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- Natively compiled Transact-SQL (T-SQL) modules
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## Unsupported data types
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The following data types aren't supported:
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- [datetimeoffset](../../t-sql/data-types/datetimeoffset-transact-sql.md)
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- [geography](../../t-sql/spatial-geography/spatial-types-geography.md)
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- [geometry](../../t-sql/spatial-geometry/spatial-types-geometry-transact-sql.md)
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- [hierarchyid](../../t-sql/data-types/hierarchyid-data-type-method-reference.md)
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- [json](../../t-sql/data-types/json-data-type.md)
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- [rowversion](../../t-sql/data-types/rowversion-transact-sql.md)
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- [sql_variant](../../t-sql/data-types/sql-variant-transact-sql.md)
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- [vector](../../t-sql/data-types/vector-data-type.md)
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- [xml](../../t-sql/xml/xml-transact-sql.md)
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- User-defined types
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## Notable supported data types
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In-Memory OLTP features support most data types. The following list is worth noting explicitly:
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| String and binary types | For more information |
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| --- | --- |
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| **binary** and **varbinary** | [binary and varbinary](../../t-sql/data-types/binary-and-varbinary-transact-sql.md) |
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| **char** and **varchar** | [char and varchar](../../t-sql/data-types/char-and-varchar-transact-sql.md) |
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| **nchar** and **nvarchar** | [nchar and nvarchar](../../t-sql/data-types/nchar-and-nvarchar-transact-sql.md) |
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For the preceding string and binary data types, starting with [!INCLUDE [sssql16-md](../../includes/sssql16-md.md)]:
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- An individual memory-optimized table can also have several long columns such as **nvarchar(4000)**, even though their lengths would add to more than the physical row size of 8,060 bytes.
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- A memory-optimized table can have max length string and binary columns of data types such as **varchar(max)**.
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### Identify LOBs and other columns that are off-row
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Starting with SQL Server 2016, memory-optimized tables [support off-row columns](../../relational-databases/in-memory-oltp/table-and-row-size-in-memory-optimized-tables.md), which allow a single table row to be larger than 8060 bytes. The following Transact-SQL SELECT statement reports all columns that are off-row, for memory-optimized tables. Note that:
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In [!INCLUDE [sssql16-md](../../includes/sssql16-md.md)] and later versions, memory-optimized tables support [off-row columns](table-and-row-size-in-memory-optimized-tables.md), which allow a single table row to be larger than 8,060 bytes. The following Transact-SQL `SELECT` statement reports all columns that are off-row, for memory-optimized tables:
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- All index key columns are stored in-row.
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- Nonunique index keys can now include NULLable columns, on memory-optimized tables.
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- Indexes can be declared as UNIQUE on a memory-optimized table.
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- Nonunique index keys can include nullable columns on memory-optimized tables.
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- Indexes can be declared as `UNIQUE` on a memory-optimized table.
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- All LOB columns are stored off-row.
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- A max_length of -1 indicates a large object (LOB) column.
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- A `max_length` of `-1` indicates a large object (LOB) column.
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```sql
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SELECT
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OBJECT_NAME(m.object_id) as [table],
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c.name as [column],
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c.max_length
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FROM
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sys.memory_optimized_tables_internal_attributes AS m
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JOIN sys.columns AS c
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ON m.object_id = c.object_id
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AND m.minor_id = c.column_id
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WHERE
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m.type = 5;
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SELECT OBJECT_NAME(m.object_id) AS [table],
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c.name AS [column],
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c.max_length
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FROM sys.memory_optimized_tables_internal_attributes AS m
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INNER JOIN sys.columns AS c
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ON m.object_id = c.object_id
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AND m.minor_id = c.column_id
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WHERE m.type = 5;
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```
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### Other data types
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### Other Data Types
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| Other types | For more information |
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| --- | --- |
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| **table** types | [Faster temp table and table variable by using memory optimization](faster-temp-table-and-table-variable-by-using-memory-optimization.md) |
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## Related content
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|Other Types|For more information|
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|-----------------|--------------------------|
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|table types|[Memory-Optimized Table Variables](../../relational-databases/in-memory-oltp/faster-temp-table-and-table-variable-by-using-memory-optimization.md)|
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## See Also
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[Transact-SQL Support for In-Memory OLTP](../../relational-databases/in-memory-oltp/transact-sql-support-for-in-memory-oltp.md)
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[Implementing SQL_VARIANT in a Memory-Optimized Table](../../relational-databases/in-memory-oltp/implementing-sql-variant-in-a-memory-optimized-table.md)
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[Table and Row size in Memory-Optimized Table](../../relational-databases/in-memory-oltp/table-and-row-size-in-memory-optimized-tables.md)
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- [Transact-SQL Support for In-Memory OLTP](transact-sql-support-for-in-memory-oltp.md)
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- [Implementing SQL_VARIANT in a Memory-Optimized Table](implementing-sql-variant-in-a-memory-optimized-table.md)
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- [Table and row size in memory-optimized tables](table-and-row-size-in-memory-optimized-tables.md)

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