If we cannot rebuild constraints due to metadata lock, now the tool won't delete the new table nor the triggers so the old table and the new table will have the same data and since the triggers are still in place, new_table will keep getting the updates. Also, the tool will show the commands that the user need to run manually to complete the process
Percona Toolkit
Percona Toolkit is a collection of advanced command-line tools used by Percona support staff to perform a variety of MySQL and system tasks that are too difficult or complex to perform manually.
These tools are ideal alternatives to private or "one-off" scripts because they are professionally developed, formally tested, and fully documented. They are also fully self-contained, so installation is quick and easy and no libraries are installed.
Percona Toolkit is developed and supported by Percona Inc. For more information and other free, open-source software developed by Percona, visit http://www.percona.com/software/.
Installing
To install all tools, run:
perl Makefile.PL
make
make test
make install
You probably need to be root to make install. On most systems, the tools
are installed in /usr/local/bin. See the INSTALL file for more information.
Documentation
Run man percona-toolkit to see a list of installed tools, then man tool
to read the embedded documentation for a specific tool. You can also read
the documentation online at http://www.percona.com/software/percona-toolkit/.
Version 3
Starting from version 3, there are new tools for MongoDB. These tools are written in Go so
in order to compile these program, this repo must me cloned into the GOPATH directory.
Example:
mkdir ${HOME}/go
export GOPATH=${HOME}/go
mkdir -p ${HOME}/go/src/github.com/percona
cd ${HOME}/go/src/github.com/percona
git clone https://github.com/percona/percona-toolkit.git
cd percona-toolkit/src/go
make