Sql Native Client 12 -

SQL Server Native Client 11.0 and 12.0 (SQLNCLI11, SQLNCLI12) were standalone data access APIs (Application Programming Interfaces) that combined OLE DB and ODBC (Open Database Connectivity) support for SQL Server. This paper examines SQLNCLI12, its architecture, key features, performance enhancements, and security improvements. It also discusses Microsoft’s deprecation strategy in favor of the Microsoft OLE DB Driver for SQL Server and the ODBC Driver for SQL Server, providing migration guidance.

| Feature | SQLNCLI12 | MSOLEDBSQL 19 | ODBC 17+ | |---------|-----------|---------------|-----------| | Always Encrypted | Limited | Full (with secure enclaves) | Full | | Azure AD Auth | No | Yes | Yes | | Multi-subnet failover | Yes | Yes | Yes | | TLS 1.2/1.3 | TLS 1.2 only | TLS 1.2, 1.3 | TLS 1.2, 1.3 | | Support lifecycle | Ended | Active (until 2030+) | Active |

The 2012 Native Client (v11) is a single dynamic-link library (DLL) containing both the and the SQL ODBC driver . It was built to support: sql native client 12

It is crucial to note the status of SQL Server Native Client 12 regarding long-term development:

SQL Server Native Client 12 was a robust data access layer for SQL Server 2012–2017 environments. However, its deprecation requires organizations to migrate to current drivers to maintain security, performance, and compatibility with modern SQL Server and cloud platforms. Legacy applications still using SQLNCLI12 should plan an upgrade path, as future Windows versions and SQL Server releases may remove support entirely. SQL Server Native Client 11

| Technology | Current Replacement | |------------|----------------------| | SQLNCLI12 (OLE DB) | Microsoft OLE DB Driver for SQL Server (MSOLEDBSQL) | | SQLNCLI12 (ODBC) | Microsoft ODBC Driver for SQL Server (MSODBCSQL) |

Unlike MDAC, which used separate providers, SQLNCLI12 provides unified management of connection pooling, metadata caching, and transaction handling. It communicates directly with the Tabular Data Stream (TDS) protocol. | Feature | SQLNCLI12 | MSOLEDBSQL 19 |

SQLNCLI12 is a single dynamic-link library (DLL) that implements both: