The defaults that MySQL comes with are probably not what you want.
We got caught by this at work and followed the instructions given in How to calculate a good InnoDB log file size
Edit /etc/mysql/my.cnf to reflect:query_cache_limit = 4M query_cache_size = 32M table_cache = 768 innodb_open_files = 512 innodb_buffer_pool_size = 512M innodb_additional_mem_pool_size = 512M innodb_log_file_size = 128M innodb_log_buffer_size = 8M innodb_thread_concurrency = 8 innodb_concurrency_tickets = 500 innodb_lock_wait_timeout=200 innodb_autoinc_lock_mode= 2 innodb_commit_concurrency=4 innodb_flush_log_at_trx_commit=2 innodb_support_xa=false innodb_checksums=0 innodb_doublewrite=0 innodb_max_dirty_pages_pct=15
Discover the location of datadir typically datadir = /var/lib/mysql
service mysql stop
mv /var/lib/mysql/ib_logfile0 /var/lib/mysql/ib_logfile0_old
mv /var/lib/mysql/ib_logfile1 /var/lib/mysql/ib_logfile1_old
service mysql start
