Search Results for: mysql sum

Data inconsistencies on MySQL replicas: Beyond pt-table-checksum

Percona Toolkit’s pt-table-checksum is a great tool to find data inconsistencies between a MySQL master and its replicas. However it is sometimes not enough to know that there are inconsistencies and let pt-table-sync fix the issue: you may want to know which exact rows are different to identify the statements that created the inconsistency. This […]

MySQL and Openstack deep dive talk at OpenStack Paris Summit (and more!)

I will present a benchmarking talk next week (Nov. 4) at the OpenStack Paris Summit with Jay Pipes from Mirantis. In order to be able to talk about benchmarking, we had to be able to set up and tear down OpenStack environments really quickly. For the benchmarks, we are using a deployment on AWS (ironically) […]

Paris OpenStack Summit Voting – Percona Submits 16 MySQL Talks

MySQL plays a critical role in OpenStack. It serves as the host database supporting most components such as Nova, Glance, and Keystone and is the most mature guest database in Trove. Many OpenStack operators use Percona open source software including the MySQL drop-in compatible Percona Server and Galera-based Percona XtraDB Cluster as well as tools such as Percona XtraBackup and Percona Toolkit. […]

Summertime Percona MySQL training update

Now that June has arrived it is time to plan what you will do over the summer months. In addition to your summer vacation plans, give thought to MySQL training for you and your team. Summer is the time to brush up on those critical skills needed to ensure all systems are ready for the holiday […]

Replication checksums in MySQL 5.6

MySQL 5.6 has an impressive list of improvements. Among them, replication checksums caught my attention as it seems that many people misunderstand the real added value of this new feature. I heard people think that with replication checksums, data integrity between the master and its replicas is now enforced. As we’ll see, it’s not that […]

DBD::mysql 4.014 breaks pt-table-checksum 2.0

DBD::mysql 4.014 breaks pt-table-checksum 2.0.  The cause is unknown, but the effect is a lot of errors like: DBD::mysql::st execute failed: called with 2 bind variables when 6 are needed [for Statement “…” with ParamValues: …] at ./pt-table-checksum line 7216. The fix is simple: upgrade (or even downgrade) DBD::mysql to any version except 4.014. To […]

3 handy tools to remove problematic MySQL processes

DBAs often encounter situations where they need to kill queries to ensure there are no long-running queries on a MySQL server that would impact performance. Long-running queries can be the result of many factors. Fortunately, Percona Server contains some handy tools to remove problematic MySQL processes. I will highlight all of the tools via some […]

MySQL community t-shirt contest for Percona Live 2015

Have designs on Percona Live this April in Silicon Valley? Send them to us! The winning entry will appear on a cool limited edition t-shirt that we’ll award to a few dozen lucky recipients at our booth’s new Percona T-Shirt Bar. The winner will also get a t-shirt, of course, along with a pair “Beats […]

Percona submits 7 talks for Vancouver OpenStack Summit (voting ends Feb. 23)

Percona has submitted seven talks for the next OpenStack Summit in Vancouver this May. And as with all OpenStack Summit events, the community decides the content. Voting ends February 23, and if you aren’t already an OpenStack Foundation member (required to vote), you can join now for free here. Percona’s Vancouver OpenStack Summit proposals Percona’s […]