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MySQL 5.6 Reference Manual
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MySQL 5.6 Reference Manual  /  ...  /  Using WER with PDB to create a Windows crashdump Using WER with PDB to create a Windows crashdump

Program Database (PDB) files (with file name suffix pdb) are included in ZIP Archive distributions (but not MSI distributions) of MySQL. These files provide information for debugging your MySQL installation in the event of a problem.

The PDB file contains more detailed information about mysqld and other tools that enables more detailed trace and dump files to be created. You can use these with WinDbg or Visual Studio to debug mysqld.


The older Dr. Watson debugging tool was removed in Microsoft Vista, with WinDbg being a common alternative.

For more information on PDB files, see Microsoft Knowledge Base Article 121366. For more information on the debugging options available, see Debugging Tools for Windows.

To use WinDbg, either install the full Windows Driver Kit (WDK) or install the standalone version.


The .exe and .pbd files must be an exact match (both version number and MySQL server edition) or WinDBG will complain while attempting to load the symbols.

  1. To generate a minidump mysqld.dmp, enable the core-file option under the [mysqld] section in my.ini. Restart the MySQL server after making these changes.

  2. Create a directory to store the generated files, such as c:\symbols

  3. Determine the path to your windbg.exe executable using the Find GUI or from the command line, for example: dir /s /b windbg.exe -- a common default is C:\Program Files\Debugging Tools for Windows (x64)\windbg.exe

  4. Launch windbg.exe giving it the paths to mysqld-debug.exe, mysqld.pdb, mysqld.dmp, and the source code. Alternatively, pass in each path from the WinDbg GUI. For example:

    windbg.exe -i "C:\mysql-5.6.42-winx64\bin\"^
     -z "C:\mysql-5.6.42-winx64\data\mysqld.dmp"^
     -srcpath "E:\ade\mysql_archives\5.6\5.6.42\mysql-5.6.42"^
     -y "C:\mysql-5.6.42-winx64\bin;SRV*c:\symbols*"^
     -v -n -c "!analyze -vvvvv"

    The ^ character and newline are removed by the Windows command line processor, so be sure the spaces remain intact.

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