。
。mysql
explain
mysql
variables
mysqladmin
my.cnf
20000
/etc/my.cnf
explain
explain
profiling
profiling
profile
profiling
/etc/my.cnf
back_log
back_log
too many connectionswait_timeout
wait_timeout
/etc/my.cnf
key_reads/key_buffer_size 1/100 1/1000
6
key_buffer_size
mysqld
5
mysql
query_cache
/etc/my.cnf
mysqld
