ODBC Driver for Oracle

Connection String Options - Oracle ODBC Driver

Oracle Connection Options

The following table describes the options that you can include in the connection string for Oracle:

Option Description

Character Set

Used to set the character set that the driver uses to read and write character data.

Connect Mode

Used to specify the system privileges to use when a user connects to the server.

Connection Timeout

Used to specify the time in seconds before an attempt to make a connection is considered unsuccessful.


Enables or disables the Direct mode


Used to select the Oracle client to use with the application.


Used to specify the host of the data source


Used to specify the version of the Internet Protocol. IPv4 and IPv6 are available. The IPv4 + IPv6 value allows to check for available protocol versions and use the first available automatically.


Respectively, if the SQL_ATTR_ROW_ARRAY_SIZE attribute value is less than MinFetchRows, then the number of rows queried from the server will equal MinFetchRows. Otherwise - it will be equal to SQL_ATTR_ROW_ARRAY_SIZE.

In order to make the driver to query from the server exactly the same number of rows as specified in the SQL_ATTR_ROW_ARRAY_SIZE attribute, it is enough to set the MinFetchRows parameter to 0. However, in this case, you should take into account, that the SQL_ATTR_ROW_ARRAY_SIZE value is 1 by default, and therefore performance decreases dramatically at this value.


Used to supply a password for login.


Used to specify the port number for the connection. 1521 by default.


Used to change the current schema of the session to the specified schema.


Serves to supply the server name for login.


Used to specify the name of the Oracle Client. The value may be selected from the drop-down list of available clients.


Used to specify the security identifier.

Use Unicode

Used to enable or disable Unicode support.

User ID

Used to supply a user name for login.

Advanced Settings

Option Description

Allow NULL strings

To retrieve metadata, not all parameters according to MSDN can accept a null value. If NULL, the driver should return an error. But some 3rd-party tools pass NULL to the parameters. These options should be enabled for compatibility with such tools.

Empty strings as NULL

String Types

Sets the string value types returned by the driver as Default, Ansi or Unicode.

  • Default - the driver defines the string types.
  • Ansi - all string types will be returned as SQL_CHAR, SQL_VARCHAR and SLQ_LONGVARCHAR.
  • Unicode - all string types will be returned as SQL_WCHAR, SQL_WVARCHAR and SLQ_WLONGVARCHAR.

The option value should be changed if any third-party tool supports only Ansi string types or Unicode ones.


Enables using local regional settings when converting numbers to string.


Enables using local regional settings when converting dates and times to string.

Oracle ODBC Connection String sample

DRIVER={Devart ODBC Driver for Oracle};Data Source=ORCL;User ID=scott;Password=tiger

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