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Problem querying MySQL Database from a MSSQL Linked Server

Posted on 2011-04-19
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Last Modified: 2012-05-11
I'm trying to query a MySQL database via a SQL2008 linked server and am getting the following error:

OLE DB provider "MSDASQL" for linked server "DENEB" returned message "[MySQL][ODBC 5.1 Driver][mysqld-5.0.26]MySQL client ran out of memory".
Msg 7320, Level 16, State 2, Line 1
Cannot execute the query "SELECT * FROM sitescape.SS_ChangeLogs" against OLE DB provider "MSDASQL" for linked server "DENEB".


My query is as follows:
SELECT * FROM OPENQUERY(DENEB, 'SELECT * FROM sitescape.SS_ChangeLogs')

I can successfully query ANY individual columns from the MySQL source table above with the exception of one which is defined in the MySQL table as a "longtext". This is probably similar to MSSQL's "ntext" or "text".

Even querying just the longtext column alone generates the error.

I need to be able to query the table in it's entirety in effort to bring the MySQL table into a SQL Server equivalent. Any ideas of what I can do to beat/circumvent the error?

The MySQL source table is about 150k rows and sits on a separate server than the MSSQL server I'm querying from.

Thanks much,
Mike

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Question by:glo-dba
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by:Walter Ritzel
Walter Ritzel earned 750 total points
ID: 35426264
You should list in your select statement all the columns of that table, instead of using the *
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Author Comment

by:glo-dba
ID: 35426444
When I reference the binary column directiy in the select statement the same error occurs.
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Walter Ritzel earned 750 total points
ID: 35426471
Yes, I forgot to mention. You probably dont have how to bring the binary column in a standard select. I would say that for this specific field, you should create some code that will dump the information from this field directly from MySQL into a folder (assuming the content is a file or something like that), and then reload into mssql.

Again, this is my experience. Maybe someone has other idea.
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Author Closing Comment

by:glo-dba
ID: 36429763
Ultimately casting the binary into a varchar(max) got me around the problem.
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