Difference between revisions of "Mysql notes"
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Revision as of 11:34, 12 December 2009
Notes on MySQL:
I generally store my MySQL password in an environment variable (like MYSQL_PASSWORD) and then have all of the mysql commands aliased to use the password, e.g.:
alias mysql="mysql -p$MYSQL_PASSWORD" alias mysqladmin="mysqladmin -p$MYSQL_PASSWORD"
Look at the system load. If mysqld is not consuming 100% of the system load, then it is disk-bound, not CPU bound. You need to increase the buffers.
In the file my.cnf, try editing these values and making them larger until the system is CPU bound:
key_buffer = 8192M innodb_buffer_pool_size = 1024M sort_buffer_size = 100M read_buffer_size = 100M read_rnd_buffer_size = 100M myisam_sort_buffer_size = 100M query_cache_size = 1024M
# Try number of CPU's*2 for thread_concurrency thread_concurrency = 8
Try these commands:
mysql> SHOW INNODB STATUS\G
- Useful admin commands
MySQL is built in. I find it easier to use Apple's provided server, rather than building my own:
To restart the server (for some reason, launchctl doesn't stop the MySQL server):
mysqladmin shutdown sudo launchctl start org.mysql.mysqld
sudo /etc/init.d/mysql restart