When the Microsoft ODBC Driver for SQL Server and the
Microsoft OLE DB provider for SQL Server use the SET FMTONLY Transact-SQL hint
to retrieve metadata information for a query, the query may be fully executed.
This behavior can affect the performance of the metadata information fetch
process.
This problem occurs when an unbound parameter forces the SQL
driver to fetch metadata before the actual SQL statement runs. For example, if
a client runs the following SQL statement, the SQL driver may require metadata
information about the
au_id column before the driver runs the
actual query and fetches the data:
Select * from authors where au_id=?
This metadata fetch will occur only if the programmer does not
explicitly bind the parameter.
Hotfix information
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the
Time Zone tab in the Date and Time tool in Control Panel.
MDAC 2.8
Date Time Version Size File name
---------------------------------------------------------
12-Feb-2004 15:37 2000.81.9044.0 61,440 Dbnetlib.dll
12-Feb-2004 15:34 2.71.9044.0 126,976 Msdart.dll
12-Feb-2004 15:34 3.520.9044.0 204,800 Odbc32.dll
12-Feb-2004 15:38 2000.81.9044.0 24,576 Odbcbcp.dll
12-Feb-2004 15:38 3.520.9044.0 98,304 Odbccp32.dll
12-Feb-2004 15:35 2.71.9044.0 417,792 Oledb32.dll
12-Feb-2004 15:37 2000.81.9044.0 471,040 Sqloledb.dll
12-Feb-2004 15:37 2000.81.9044.0 385,024 Sqlsrv32.dll
To work around this problem, bind all parameters before you
run a SQL statement with the SQL driver. Any unbound parameter will force the
SQL driver to fetch metadata before it runs the actual SQL statement.
Note We recommend that you explicitly bind all parameters to optimize
performance with the SQL drivers and Microsoft SQL Server.
Microsoft
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
For additional information, click the
following article number to view the article in the Microsoft Knowledge Base:
824684Â
(http://kbalertz.com/Feedback.aspx?kbNumber=824684/
)
Description of the standard terminology that is used to describe Microsoft software updates