BUG: Extra Block of 256 Bytes Used by Access ODBC Driver

 Last reviewed: September 9, 1996
Article ID: Q111724
The information in this article applies to:
  • Microsoft Open Database Connectivity, version 1.0

BUG# ODBCDBASE: 2048 (1.01.1928)

SYMPTOMS

The following sequence of calls, 

   SQLAllocEnv, SQLAllocConnect, SQLConnect (or SQLDriverConnect),
   SQLDisconnect, SQLFreeConnect, and SQLFreeEnv
will cause an extra block of 256 bytes to be used by the application that made the calls. This happens only with the Access ODBC Driver.

STATUS

Microsoft has confirmed this to be a problem in the Access Driver version 1.01.1928. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce the Problem

Start the Heapwalker (for memory analysis). Start the ODBC Test application. Instead of using ODBC Test you can use other ODBC application.

  1. From the Connect menu, choose SQLAllocEnv.

  2. From the Connect menu, choose SQLAllocConnect.

  3. From the Connect menu, choose SQLConnect and connect to any Microsoft Access data source. You may alternatively choose SQLDriverConnect instead of SQLConnect.

  4. From the Connect menu, choose SQLDisconnect, SQLFreeConnect, and SQLFreeEnv.

Heapwalker shows one more memory block of 256 bytes for ODBCTST. Every time you repeat steps 2 through 4, a new memory block of 256 bytes stays allocated. This block is fixed and is in the global heap. These blocks are freed on program termination.

NOTE: This happens only with the Microsoft ODBC Access driver. It does not happen with any of the other desktop database drivers: viz., DBASE, Paradox, Btrieve, FoxPro, XLS, and Text.

KBCategory: kbusage
KBSubcategory:

Additional reference words: 1.01.1928 DDD VISUAL C++ 1.5



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Last reviewed: September 9, 1996
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