NAMEoak-prepare-shutdown: make for a fast and safe MySQL shutdown
SYNOPSISPrepare and shutdown the MySQL server:
oak-prepare-shutdown --user=root --ask-pass --socket=/tmp/mysql.sock && /etc/init.d/mysql stopPrepare and shutdown the MySQL server, RedHat style:
oak-prepare-shutdown --user=root --ask-pass --socket=/tmp/mysql.sock && service mysql stopSame as above, use defaults file:
oak-prepare-shutdown --defaults-file=/home/myuser/.my-oak.cnf && service mysql stop
This tools makes for a faster and safe shutdown process:
- It flushes InnoDB buffer pool pages until no further progress can be achieved for the duration of 10 consequent seconds
- When server acts as a slave, it gracefully stops replication while verifying no slave temporary tables remain open
Flushing of InnoDB pages is performed by setting innodb_max_dirty_pages_pct to 0. InnoDB follows by attempting to reach that target. On an active server, it will most probably never reach 0. oak-prepare-shutdown follows up on the rate of page flush, and terminates when it concludes no more gain is expected.
Interrupting this tool with Ctrl-C results with restoring original settings and termination with error.
Any abnormal termination of this tools results with innodb_max_dirty_pages_pct still being set to 0. This may seriously degrade the performance of your running database. Make sure to manually restore to original settings, e.g. via:
mysql> SET GLOBAL innodb_max_dirty_pages_pct = 90;
Prompt for password.--debug
Print stack trace on error.--defaults-file=DEFAULTS_FILE
Read from MySQL configuration file. Overrides --user, --password, --socket, --port.
Configuration needs to be in the following format:
MySQL host (default: localhost)-p PASSWORD, --password=PASSWORD
MySQL password-P PORT, --port=PORT
TCP/IP port (default: 3306)-S SOCKET, --socket=SOCKET
MySQL socket file. Only applies when host is localhost-u USER, --user=USER
MySQL user-v, --verbose
Print user friendly messages
ENVIRONMENTRequires MySQL 5.0 or newer, python 2.3 or newer. python-mysqldb must be installed in order to use this tool. You can
apt-get install python-mysqldbor
yum install mysql-python
LICENSEThis tool is released under the BSD license.
Copyright (c) 2008 - 2010, Shlomi Noach All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the organization nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.