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 AUGUST 31, 2020

Applies to:

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

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.