Maatkit (formerly MySQL Toolkit) version 1297 contains a significant update to MySQL Table Checksum (which will be renamed soon to avoid trademark violations). The changelog follows. What you don’t see in the changelog is the unit test suite! I got a lot more of the code into modules that are tested and re-usable.
2007-11-18: version 1.1.19 * Check for needed privileges on --replicate table before beginning. * Made some error messages more informative. * Fixed child process exit status with 8-bit right-shift. * Improved checksumming code auto-detects best algorithm and function. * Added --ignoreengine option; ignores federated and merge by default. * Added --columns and --checksum options. * Removed --chunkcol, --chunksize-exact, --index options. * --chunksize can be specified as a data size now. * Improved chunking algorithm handles more cases and uses fewer chunks. * Do not print --replcheck results for servers that are not slaves. * Create only one DB connection for each host, not one per host/tbl/chunk. * Code assumed backtick quoting, broke on SQL_MODE=ANSI (bug #1813030). * There were many potential bugs with database and table name quoting. * Child exit status errors could be masked by subsequent successes.