Session Properties - SQL Server Native Client OLE DB provider
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Important
The SQL Server Native Client (often abbreviated SNAC) has been removed from SQL Server 2022 (16.x) and SQL Server Management Studio 19 (SSMS). Both the SQL Server Native Client OLE DB provider (SQLNCLI or SQLNCLI11) and the legacy Microsoft OLE DB Provider for SQL Server (SQLOLEDB) are not recommended for new development. Switch to the new Microsoft OLE DB Driver (MSOLEDBSQL) for SQL Server going forward.
The SQL Server Native Client OLE DB provider interprets OLE DB session properties as follows.
| Property ID | Description |
|---|---|
| DBPROP_SESS_AUTOCOMMITISOLEVELS | The SQL Server Native Client OLE DB provider supports all autocommit transaction isolation levels with the exception of the chaos level DBPROPVAL_TI_CHAOS. |
In the provider-specific property set DBPROPSET_SQLSERVERSESSION, the SQL Server Native Client OLE DB provider defines the following additional session property.
| Property ID | Description |
|---|---|
| SSPROP_QUOTEDCATALOGNAMES | Type: VT_BOOL R/W: Read/write Default: VARIANT_FALSE Description: Quoted identifiers allowed in CATALOG restriction. VARIANT_TRUE: Quoted identifiers are recognized for a catalog restriction for the schema rowsets that supply distributed query support. VARIANT_FALSE: Quoted identifiers are not recognized for a catalog restriction for the schema rowsets that supply distributed query support. For more information about schema rowsets that supply distributed query support, see Distributed Query Support in Schema Rowsets. |
| SSPROP_ALLOWNATIVEVARIANT | Type: VT_BOOL R/W: Read/Write Default: VARIANT_FALSE Description: Determines if the data fetched in is as DBTYPE_VARIANT or DBTYPE_SQLVARIANT. VARIANT_TRUE: Column type is returned as DBTYPE_SQLVARIANT in which case the buffer will hold SSVARIANT structure. VARIANT_FALSE: Column type is returned as DBTYPE_VARIANT and the buffer will have VARIANT structure. |
| SSPROP_ASYNCH_BULKCOPY | To use asynchronous mode, set the provider specific session property SSPROP_ASYNCH_BULKCOPY to VARIANT_TRUE before calling the BCPExec method. This property is available in the DBPROPSET_SQLSERVERSESSION property set. |