MS SQLServer Linked Server is performing slow when using Oracle OLEDB Provider compared to MSDASQL or ODBC drivers

(Doc ID 1996475.1)

Last updated on NOVEMBER 29, 2016

Applies to:

Oracle Provider for OLE DB - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

The linked server query using Oracle OLEDB Provider is taking 4 minutes to run compared to 1 minute in 10g client. Query used is on a table with VARCHAR and Number columns and have good number of rows like 200k or more.

select * into openquery('select * from table_name;');

Changes

Have upgraded the MS SQL Server or the Oracle Client or both recently.

Cause

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