MySQL Toolkit distribution 620 releasedThu, Jul 5, 2007 in Databases Open Source
MySQL Toolkit distribution 620 updates documentation and test suites, includes some major bug fixes and functionality changes, and adds one new tool to the toolkit. This article is mostly a changelog, with some added notes.
Many of the tools have matured and I just needed to make the documentation top-notch, but there’s still a lot to be done on the crucial checksumming and syncing tools. Time is in short supply for me right now, though. In fact, I actually finished this release on June 22, but wasn’t able to release it till just tonight!
Documentation is now maintained online at the MySQL Toolkit website, by the way.
- Added more hooks for plugins before and after archiving.
- Made –time suffix optional.
- MySQL Archiver could crash on a lock wait timeout when –txnsize was not set
- Changed the format of the –source and –dest options.
mysql-query-profiler and mysql-profile-compact
Version 0.9.2. This is an initial release of a new tool. I found myself in a situation where I needed to do some complex error-skipping on a replica (its relay logs got into an infinite loop). I have written throwaway scripts to skip, restart, check, skip several times in the past, but this situation called for something more complex. Again I realized I was three-quarters of the way to a more flexible, powerful tool many people might find useful, so I went ahead and put the extra effort into it.
It ended up helping me avoid re-snapshotting a replica with a ton of data, so it was worth it.
mysql-table-checksum and mysql-checksum-filter
This version fixes some badly optimized chunking queries. As I have mentioned in the past, the chunking behavior is preliminary and subject to change. This is still true, but this release is much smarter than the previous release! I have also fleshed out some methods of doing chunking on real-valued columns (float, decimal, and even character). I don’t know when I’ll get a chance to code, test, and release that.
Even though much remains to be done, MySQL Table Checksum is still a great way to check that your replicas have the same data as the master. (In fact, it’s the only way I know of – and MySQL employees themselves recommend MySQL Table Checksum).
- Support complex host definitions.
- Added –explainhosts option to debug host definitions.
- Added –explain option.
- When exact chunking is impossible, mysql-table-checksum will use approximate.
- Added required ‘boundaries’ column to checksum table for –replicate.
- Chunking on temporal types defeated indexes.
I'm Baron Schwartz, the founder and CEO of VividCortex. I am the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. I contribute to various database communities such as Oracle, PostgreSQL, Redis and MongoDB.