Oracle.dataaccess Jun 2026

| Problem | Likely Cause | Solution | |---------|--------------|----------| | OracleException: ORA-12154 | TNS name not resolved | Check tnsnames.ora , connection string format | | OracleException: Unable to find Oracle Client | Oracle client not installed or path missing | Install Oracle client or use managed driver | | OracleException: ORA-00904 | Invalid column name | Check SQL and schema | | Connection pool leaks | Missing Close() or Dispose() | Wrap in using blocks | | Performance slow | No indexing, fetch size too small | Increase FetchSize , analyze SQL | | ORA-01000: maximum open cursors exceeded | Not disposing commands/readers | Ensure all IDisposables are disposed |

Deploying an application built with Oracle.DataAccess requires explicit setup on target servers: oracle.dataaccess

The installer automatically places Oracle.DataAccess.dll into the GAC ( C:\Windows\Microsoft.NET\assembly\... ). If performing a silent, xcopy deployment, administrators must manually execute the Windows Global Assembly Cache Utility: | Problem | Likely Cause | Solution |

static void Main(string[] args)

Strict. Separate 32-bit and 64-bit DLLs matching the OS/process. Universal. Compile-once target for Any CPU execution. Separate 32-bit and 64-bit DLLs matching the OS/process

If you are coming from the world of SQL Server, you might be used to parameters being matched by name automatically. In Oracle.DataAccess , the default behavior is to bind parameters by position. To avoid bugs, it is a best practice to always set cmd.BindByName = true; unless you explicitly want positional binding.