FIX: You may receive incorrect or incomplete data when you use the OLE DB Provider for DB2 in Host Integration Server 2004 after you upgrade to AS/400 Version 5 Release 3

After you upgrade to IBM AS/400 Version 5 Release 3, you may receive incorrect or incomplete data from the AS/400 when you use the Microsoft OLE DB Provider for DB2 in Microsoft Host Integration Server 2004.

The Distributed Relational Database Architecture (DRDA) code point parameter MAXBLKEXT specifies that the host should only respond with one Query Answer Set Data (QRYDTA) if the value of the MAXBLKEXT parameter is 0 on a client.

Note MAXBLKEXT is also referred to as Max Block Extra.

The problem occurs because the host is responding with two QRYDTA blocks. This response causes the data to be incorrect or incomplete.

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Host Integration Server 2004 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 item in Control Panel.

File name	File version	File size	Date	Time
Db2oledb.dll	6.0.1952.0	487,424	13-May-2005	23:34
Db2oledb.h	Not Applicable	24,516	13-May-2005	23:39
Ddmstr.dll	6.0.1952.0	44,032	13-May-2005	23:34
Drdaresync.exe	6.0.1952.0	336,384	13-May-2005	23:35
Microsoft.hostintegration.msdb2client.dll	6.0.1952.0	114,688	13-May-2005	23:34
Mseidb2c.dll	6.0.1952.0	71,680	13-May-2005	23:34
Mseidb2d.dll	6.0.1952.0	435,200	13-May-2005	23:34
Mseidrda.dll	6.0.1952.0	692,736	13-May-2005	23:35

Note Because of file dependencies, the most recent hotfix that contains these files may contain additional files.

Additionally, IBM has released a fix for this issue. For more information about the IBM fix, see the following IBM Web site: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Typically, when a query returns a large result, the following sequence of the DRDA/DDM code points is used.

1.	Send:	PRPSQLSTT (Prepare SQL Statement) SQLSTT (The SQL Statement)
2.	Receive:	SQLDARD (Column Early Metadata)
3.	Send:	OPNQRY (Open Query)
4.	Receive:	OPNQRYRM (Open Query Reply message) QRYDSC (Column Late Metadata) QRYDTA (First block of result set data)
5.	Send:	CNTQRY (Continue Query)
6.	Receive:	QRYDTA (Another block of result set data)
7.	Send:	CNTQRY (Continue Query)
8.	Receive:	QRYDTA (Another block of result set data)

In the problem that is described in the "Symptoms" section, a deviation occurs that starts at step 5.

5.	Send:	CNTQRY (Continue Query)
6.	Receive:	QRYDTA (Another block of result set data) QRYDTA (Another block of result set data)
7.	Send:	CNTQRY (Continue Query)
8.	Receive:	QRYDTA (Another block of result set data) QRYDTA (Another block of result set data)

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: