Transact-SQL Constructs Not Supported by In-Memory OLTP

Memory-optimized tables and natively compiled stored procedures do not support the full Transact-SQL surface area that is supported by disk-based tables and interpreted Transact-SQL stored procedures. When attempting to use one of the unsupported features, the server returns an error.

The error message text mentions the type of Transact-SQL statement (feature, operation, option, for example) and well as the name of the feature or Transact-SQL keyword. Most unsupported features will return error 10794, with the error message text indicating the unsupported feature. The following tables list the Transact-SQL features and keywords that can appear in the error message text, as well as the corrective action to resolve the error.

For more information on supported features with memory-optimized tables and natively compiled stored procedures, see:

Databases That Use In-Memory OLTP

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving an In-Memory OLTP database.

Type Name Resolution
Option AUTO_CLOSE The database option AUTO_CLOSE=ON is not supported with databases that have a MEMORY_OPTIMIZED_DATA filegroup.
Option ATTACH_REBUILD_LOG The CREATE database option ATTACH_REBUILD_LOG is not supported with databases that have a MEMORY_OPTIMIZED_DATA filegroup.
Feature DATABASE SNAPSHOT Creating database snapshots is not supported with databases that have a MEMORY_OPTIMIZED_DATA filegroup.
Feature Replication using the sync_method 'database snapshot' or 'database snapshot character' Replication using the sync_method 'database snapshot' or 'database snapshot character' is not supported with databases that have a MEMORY_OPTIMIZED_DATA filegroup.
Feature DBCC CHECKDB

DBCC CHECKTABLE
DBCC CHECKDB skips the memory-optimized tables in the database.

DBCC CHECKTABLE will fail for memory-optimized tables.

Memory-Optimized Tables

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving a memory-optimized table, as well as the corrective action to resolve the error.

Type Name Resolution
Feature ON Memory-optimized tables cannot be placed on a filegroup or partition scheme. Remove the ON clause from the CREATE TABLE statement.
Data type Data type name The indicated data type is not supported. Replace the type with one of the supported data types. For more information, see Supported Data Types.
Feature Computed columns Computed columns are not supported for memory-optimized tables. Remove the computed columns from the CREATE TABLE statement.
Feature Replication Replication is not supported with memory-optimized tables.
Feature FILESTREAM FILESTREAM storage is not supported columns of memory-optimized tables. Remove the FILESTREAM keyword from the column definition.
Feature SPARSE Columns of memory-optimized tables cannot be defined as SPARSE. Remove the SPARSE keyword from the column definition.
Feature ROWGUIDCOL The option ROWGUIDCOL is not supported for columns of memory-optimized tables. Remove the ROWGUIDCOL keyword from the column definition.
Feature FOREIGN KEY FOREIGN KEY constraints are not supported for memory-optimized tables. Remove the constraint from the table definition.

For information about how to mitigate the lack of support for constraints, see Migrating Check and Foreign Key Constraints.
Feature CHECK CHECK constraints are not supported for memory-optimized tables. Remove the constraint from the table definition.

For information about how to mitigate the lack of support for constraints, see Migrating Check and Foreign Key Constraints.
Feature UNIQUE UNIQUE constraints are not supported for memory-optimized tables. Remove the constraint from the table definition.

For information about how to mitigate the lack of support for constraints, see Migrating Check and Foreign Key Constraints.
Feature COLUMNSTORE COLUMNSTORE indexes are not supported with memory-optimized tables. Specify a NONCLUSTERED or NONCLUSTERED HASH index instead.
Feature clustered index Specify a nonclustered index. In the case of a primary key index be sure to specify PRIMARY KEY NONCLUSTERED [HASH].
Feature non-1252 code page Columns in memory-optimized tables with data types char and varchar must use code page 1252. Use n(var)char instead of (var)char, or use a collation with code page 1252 (for example, Latin1_General_BIN2). For more information, see Collations and Code Pages.
Feature DDL inside transactions Memory-optimized tables and natively compiled stored procedures cannot be created or dropped in the context of a user transaction. Do not start a transaction and ensure the session setting IMPLICIT_TRANSACTIONS is OFF before executing the CREATE or DROP statement.
Feature DDL triggers Memory-optimized tables and natively compiled stored procedures cannot be created or dropped if there is a server or database trigger for that DDL operation. Remove the server and database triggers on CREATE/DROP TABLE and CREATE/DROP PROCEDURE.
Feature EVENT NOTIFICATION Memory-optimized tables and natively compiled stored procedures cannot be created or dropped if there is a server or database event notification for that DDL operation. Remove the server and database event notifications on CREATE TABLE or DROP TABLE and CREATE PROCEDURE or DROP PROCEDURE.
Feature FileTable Memory-optimized tables cannot be created as file tables. Remove the argument AS FileTable from the CREATE TABLE statement
Operation Update of primary key columns Primary key columns in memory-optimized tables and table types cannot be updated. If the primary key needs to be updated, delete the old row and insert the new row with the updated primary key.
Operation CREATE INDEX Indexes on memory-optimized tables must be specified inline with the CREATE TABLE statement. To add an index to a memory-optimized table, drop and recreate the table, including the new index specification.
Operation ALTER TABLE Altering memory-optimized tables is not supported. Drop and recreate the table using the updated table definition.
Operation CREATE FULLTEXT INDEX Fulltext indexes are not supported for memory-optimized tables.
Operation schema change Memory-optimized tables and natively compiled stored procedures do not support shema changes, for example, sp_rename.

Attempting to make schema changes, such as renaming a table, will generate error 12320, Operations that require a change to the schema version, for example renaming, are not supported with memory-optimized tables.

To change the schema, drop and recreate the table or procedure using an updated definition.
Operation CREATE TRIGGER Triggers on memory-optimized tables are not supported.
Operation TRUNCATE TABLE The TRUNCATE operation is not supported for memory-optimized tables. To remove all rows from a table, delete all rows using DELETE FROMtable or drop and recreate the table.
Operation ALTER AUTHORIZATION Changing the owner of an existing memory-optimized table or natively compiled stored procedure is not supported. Drop and recreate the table or procedure to change ownership.
Operation ALTER SCHEMA Changing the schema of an existing memory-optimized table or natively compiled stored procedure is not supported. Drop and recreate the table or procedure to change the schema.
Operation DBCC CHECKTABLE DBCC CHECKTABLE is not supported with memory-optimized tables.
Feature ANSI_PADDING OFF The session option ANSI_PADDING must be ON when creating memory-optimized tables or natively compiled stored procedures. Execute SET ANSI_PADDING ON before running the CREATE statement.
Option DATA_COMPRESSION Data compression is not supported for memory-optimized tables. Remove the option from the table definition.
Feature DTC Memory-optimized tables and natively compiled stored procedures cannot be accessed from distributed transactions. Use SQL transactions instead.
Feature Multiple Active Result Sets (MARS) Multiple Active Result Sets (MARS) is not supported with memory-optimized tables. This error can also indicate linked server use. Linked server can use MARS. Linked servers are not supported with memory-optimized tables. Instead, connect directly to the server and database that hosts the memory-optimized tables.
Operation Memory-optimized tables as target of MERGE Memory-optimized tables cannot be the target of a MERGE operation. Use INSERT, UPDATE, or DELETE statements instead.

Indexes on Memory-Optimized Tables

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving an index on a memory-optimized table, as well as the corrective action to resolve the error.

Type Name Resolution
Feature Filtered index Filtered indexes are not supported with memory-optimized tables. Omit the WHERE clause from the index specification.
Feature UNIQUE Unique indexes are not supported for memory-optimized tables. Remove the argument UNIQUE from the index specification.
Feature Nullable columns All columns in the key of an index on a memory-optimized table must be specified as NOT NULL. Include the NOT NULL constraint with all columns in the index keys.
Feature non-bin2 collation All character columns in the key of a memory-optimized index must be declared using a BIN2 collation. Use the COLLATE clause to set the collation in the column definition. For more information, see Collations and Code Pages.
Feature Included columns Specifying included columns is not necessary for memory-optimized tables. All columns of the memory-optimized table are implicitly included in every memory-optimized index.
Operation ALTER INDEX Altering indexes on memory-optimized tables is not supported. Instead, drop the table and recreate it using the updated index specification.
Operation DROP INDEX Dropping indexes on memory-optimized tables is not supported. Instead, drop the table and recreate it with the desired indexes.
Index option Index option The indicated index option is not supported with indexes on memory-optimized tables. Remove the option from the index specification.

Nonclustered Hash Indexes

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving a nonclustered hash index, as well as the corrective action to resolve the error.

Type Name Resolution
Option ASC/DESC Nonclustered hash indexes are not ordered. Remove the keywords ASC and DESC from the index key specification.

Natively Compiled Stored Procedures

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving natively compiled stored procedures, as well as the corrective action to resolve the error.

Type Feature Resolution
Feature Inline table variables Table types cannot be declared inline with variable declarations. Table types must be declared explicitly using a CREATE TYPE statement.
Feature Cursors Cursors are not supported on or in natively compiled stored procedures.

-When executing the procedure from the client, use RPC rather than the cursor API. With ODBC, avoid the Transact-SQL statement EXECUTE, instead specify the name of the procedure directly.

-When executing the procedure from a Transact-SQL batch or another stored procedure, avoid using a cursor with the natively compiled stored procedure.

-When creating a natively compiled stored procedure, rather than using a cursor, use set-based logic or a WHILE loop.
Feature Non-constant parameter defaults When using default values with parameters on natively compiled stored procedures, the values must be constants. Remove any wildcards from the parameter declarations.
Feature EXTERNAL CLR stored procedures cannot be natively compiled. Either remove the AS EXTERNAL clause or the NATIVE_COMPILATION option from the CREATE PROCEDURE statement.
Feature Numbered stored procedures Natively compiled stored procedures cannot be numbered. Remove the ;number from the CREATE PROCEDURE statement.
Feature multi-row INSERT … VALUES statements Cannot insert multiple rows using the same INSERT statement in a natively compiled stored procedure. Create INSERT statements for each row.
Feature Common Table Expressions (CTEs) Common table expressions (CTE) are not supported in natively compiled stored procedures. Rewrite the query.
Feature subquery Subqueries (queries nested inside another query) are not supported. Rewrite the query.
Feature COMPUTE The COMPUTE clause is not supported. Remove it from the query.
Feature SELECT INTO The INTO clause is not supported with the SELECT statement. Rewrite the query as INSERT INTOTableSELECT.
Feature OUTPUT The OUTPUT clause is not supported. Remove it from the query.
Feature incomplete insert column list In INSERT statements, values must be specified for all columns in the table.
Function Function The built-in function is not supported in natively compiled stored procedures. Remove the function from the stored procedure. For more information about supported built-in functions, see Natively Compiled Stored Procedures.
Feature CASE The CASE statement is not supported in queries inside natively compiled stored procedures. Create queries for each case. For more information, see Implementing a CASE Statement.
Feature user-defined functions User-defined functions cannot be used in natively compiled stored procedures. Remove the reference to the function from the procedure definition.
Feature user-defined aggregates User-defined aggregate functions cannot be used in natively compiled stored procedures. Remove the reference to the function from the procedure.
Feature browse mode metadata Natively compiled stored procedures do not support browse mode metadata. Make sure the session option NO_BROWSETABLE is set to OFF.
Feature DELETE with FROM clause The FROM clause is not supported for DELETE statements with a table source in natively compiled stored procedures.

DELETE with the FROM clause is supported when it is used to indicate the table to delete from.
Feature UPDATE with FROM clause The FROM clause is not supported for UPDATE statements in natively compiled stored procedures.
Feature temporary procedures Temporary stored procedures cannot be natively compiled. Either create a permanent natively compiled stored procedure or a temporary interpreted Transact-SQL stored procedure.
Isolation level READ UNCOMMITTED The isolation level READ UNCOMMITTED is not supported for natively compiled stored procedures. Use a supported isolation level, such as SNAPSHOT.
Isolation level READ COMMITTED The isolation level READ UNCOMMITTED is not supported for natively compiled stored procedures. Use a supported isolation level, such as SNAPSHOT.
Feature temporary tables Tables in tempdb cannot be used in natively compiled stored procedures. Instead, use a table variable or a memory-optimized table with DURABILITY=SCHEMA_ONLY.
Feature MARS Multiple Active Result Sets (MARS) is not supported with natively compiled stored procedures. This error can also indicate linked server use. Linked server can use MARS. Linked servers are not supported with natively compiled stored procedures. Instead, connect directly to the server and database that hosts the natively compiled stored procedures.
Feature DTC Memory-optimized tables and natively compiled stored procedures cannot be accessed from distributed transactions. Use SQL transactions instead.
Feature non-bin2 collation Comparison, sorting, and other operations on character strings in natively compiled stored procedures require using a BIN2 collation. Use the COLLATE clause or use columns and variables with an appropriate collation. For more information, see Collations and Code Pages.
Feature Truncation of character strings with an SC collation. Character strings with an _SC collation use the UTF-16 encoding. Converting an n(var)char value to an n(var)char value with a shorted length involves truncation. This is not supported for UTF-16 values in natively compiled stored procedures. Avoid truncation of UTF-16 strings.
Feature EXECUTE WITH RECOMPILE The option WITH RECOMPILE is not supported for natively compiled stored procedures.
Feature LEN and SUBSTRING with an argument in an SC collation Character strings with an _SC collation use the UTF-16 encoding. The built-in functions LEN and SUBSTRING, when used inside natively compiled stored procedures, do not support the UTF-16 encoding. Use a different collation or avoid using these functions.
Feature Execution from the dedicated administrator connection. Natively compiled stored procedures cannot be executed from the dedicated admin connection (DAC). Use a regular connection instead.
Operation ALTER PROCEDURE Natively compiled stored procedures cannot be altered. To change the procedure definition, drop and recreate the stored procedure.
Operation savepoint Natively compiled stored procedures cannot be invoked from transactions that have an active savepoint. Remove the savepoint from the transaction.
Operation ALTER AUTHORIZATION Changing the owner of an existing memory-optimized table or natively compiled stored procedure is not supported. Drop and recreate the table or procedure to change ownership.
Operator OPENROWSET This operator is not supported. Remove OPENROWSET from the natively compiled stored procedure.
Operator OPENQUERY This operator is not supported. Remove OPENQUERY from the natively compiled stored procedure.
Operator OPENDATASOURCE This operator is not supported. Remove OPENDATASOURCE from the natively compiled stored procedure.
Operator OPENXML This operator is not supported. Remove OPENXML from the natively compiled stored procedure.
Operator CONTAINSTABLE This operator is not supported. Remove CONTAINSTABLE from the natively compiled stored procedure.
Operator FREETEXTTABLE This operator is not supported. Remove FREETEXTTABLE from the natively compiled stored procedure.
Feature table-valued functions Table-valued functions cannot be referenced from natively compiled stored procedures. One possible workaround for this restriction is to add the logic in the table-valued functions to the procedure body.
Operator CHANGETABLE This operator is not supported. Remove CHANGETABLE from the natively compiled stored procedure.
Operator GOTO This operator is not supported. Use other procedural constructs such as WHILE.
Operator EXECUTE, INSERT EXEC Nesting natively compiled stored procedures is not supported. The required operations can be specified inline, as part of the stored procedure definition.
Operator OFFSET This operator is not supported. Remove OFFSET from the natively compiled stored procedure.
Operator UNION This operator is not supported. Remove UNION from the natively compiled stored procedure. Combining several result sets into a single result set can be done using a table variable.
Operator INTERSECT This operator is not supported. Remove INTERSECT from the natively compiled stored procedure. In some cases an INNER JOIN can be used to obtain the same result.
Operator EXCEPT This operator is not supported. Remove EXCEPT from the natively compiled stored procedure.
Operator OUTER JOIN This operator is not supported. Remove OUTER JOIN from the natively compiled stored procedure. For more information, see Implementing an Outer Join.
Operator APPLY This operator is not supported. Remove APPLY from the natively compiled stored procedure.
Operator PIVOT This operator is not supported. Remove PIVOT from the natively compiled stored procedure.
Operator UNPIVOT This operator is not supported. Remove UNPIVOT from the natively compiled stored procedure.
Operator OR, IN Disjunction (OR, IN) is not supported in the WHERE clause of queries in natively compiled stored procedures. Create queries for each of the cases.
Operator CONTAINS This operator is not supported. Remove CONTAINS from the natively compiled stored procedure.
Operator FREETEXT This operator is not supported. Remove FREETEXT from the natively compiled stored procedure.
Operator NOT This operator is not supported. Remove NOT from the natively compiled stored procedure. In some cases, NOT can be replaced with inequality. For example, NOT a=b can be replaced with a!=b.
Operator TSEQUAL This operator is not supported. Remove TSEQUAL from the natively compiled stored procedure.
Operator LIKE This operator is not supported. Remove LIKE from the natively compiled stored procedure.
Operator NEXT VALUE FOR Sequences cannot be referenced inside natively compiled stored procedures. Obtain the value using interpreted Transact-SQL, and then pass it into the natively compiled stored procedure. For more information, see Implementing IDENTITY in a Memory-Optimized Table.
Set option option SET options cannot be changed inside natively compiled stored procedures. Certain options can be set with the BEGIN ATOMIC statement. For more information, see the section on atonic blocks in Natively Compiled Stored Procedures.
Operand TABLESAMPLE This operator is not supported. Remove TABLESAMPLE from the natively compiled stored procedure.
Option RECOMPILE Natively compiled stored procedures are compiled at create time. To recompile a natively compiled stored procedure, drop and recreate it. Remove RECOMPILE from the procedure definition.
Option ENCRYPTION This option is not supported. Remove ENCRYPTION from the procedure definition.
Option FOR REPLICATION Natively compiled stored procedures cannot be created for replication. Removed FOR REPLICATION from the procedure definition.
Option FOR XML This option is not supported. Remove FOR XML from the natively compiled stored procedure.
Option FOR BROWSE This option is not supported. Remove FOR BROWSE from the natively compiled stored procedure.
Join hint HASH, MERGE Natively compiled stored procedures only support nested-loops joins. Hash and merge joins are not supported. Remove the join hint.
Query hint Query hint This query hint is not inside natively compiled stored procedures. For supported query hints see Query Hints (Transact-SQL).
Option DISTINCT This option is not supported. Remove DISTINCT from the query in the natively compiled stored procedure.
Option PERCENT This option is not supported with TOP clauses. Remove PERCENT from the query in the natively compiled stored procedure.
Option WITH TIES This option is not supported with TOP clauses. Remove WITH TIES from the query in the natively compiled stored procedure.
Aggregate function Aggregate function This clause is not supported. For more information about aggregate functions in natively compiled stored procedures, see Natively Compiled Stored Procedures.
Ranking function Ranking function Ranking functions are not supported in natively compiled stored procedures. Remove them from the procedure definition.
Function Function This function is not supported. Remove it from the natively compiled stored procedure.
Statement Statement This statement is not supported. Remove it from the natively compiled stored procedure.
Feature MIN and MAX used with binary and character strings The aggregate functions MIN and MAX cannot be used for character and binary string values inside natively compiled stored procedures.
Feature GROUP BY without aggregate function In natively compiled stored procedures, when a query has a GROUP BY clause, the query must also use an aggregate function in the SELECT or the HAVING clause. Add an aggregate function to the query.
Feature GROUP BY ALL ALL cannot be used with GROUP BY clauses in natively compiled stored procedures. Remove ALL from the GROUP BY clause.
Feature GROUP BY () Grouping by an empty list is not supported. Either remove the GROUP BY clause, or include columns in the grouping list.
Feature ROLLUP ROLLUP cannot be used with GROUP BY clauses in natively compiled stored procedures. Remove ROLLUP from the procedure definition.
Feature CUBE CUBE cannot be used with GROUP BY clauses in natively compiled stored procedures. Remove CUBE from the procedure definition.
Feature GROUPING SETS GROUPING SETS cannot be used with GROUP BY clauses in natively compiled stored procedures. Remove GROUPING SETS from the procedure definition.
Feature BEGIN TRANSACTION, COMMIT TRANSACTION, and ROLLBACK TRANSACTION Use ATOMIC blocks to control transactions and error handling. For more information, see Atomic Blocks.
Feature Inline table variable declarations. Table variables must reference explicitly defined memory-optimized table types. You should create a memory-optimized table type and use that type for the variable declaration, rather than specifying the type inline.
Feature sp_recompile Recompiling natively compiled stored procedures is not supported. Drop and recreate the procedure.
Feature EXECUTE AS CALLER The EXECUTE AS clause is required. But EXECUTE AS CALLER is not supported. Use EXECUTE AS OWNER, EXECUTE ASuser, or EXECUTE AS SELF.
Feature Disk-based tables Disk-based tables cannot be accessed from natively compiled stored procedures. Remove references to disk-based tables from the natively-compiled stored procedures. Or, migrate the disk-based table(s) to memory optimized.
Feature Views Views cannot be accessed from natively compiled stored procedures. Instead of views, reference the underlying base tables.
Feature Table valued functions Table-valued functions cannot be accessed from natively compiled stored procedures. Remove references to table-valued functions from the natively compiled stored procedure.

Transactions that Access Memory-Optimized Tables

The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving transactions that access memory-optimized tables, as well as the corrective action to resolve the error.

Type Name Resolution
Feature savepoint Creating explicit savepoints in transactions that access memory-optimized tables is not supported.
Feature bound transaction Bound sessions cannot participate in transactions that access memory-optimized tables. Do not bind the session before executing the procedure.
Feature DTC Transactions that access memory-optimized tables cannot be distributed transactions.

See Also

Migrating to In-Memory OLTP