centos mysql5.6 内存过大开机占用470M innodb使用MYISAM存储引擎 优化到70M使用
安装完后发现，top内存量占用都很大，竟然有47.1%内存使用。我的vps总共才1G内存，目前只放了个discuz，不需要mysql那么大的内存。一路优化完后只有7.5%占用率了。
1、关闭innodb使用MYISAM存储引擎
参考http://docs.oracle.com/cd/E17952_01/refman-5.6-en/innodb-turning-off.html
2、添加配置（可以先单独尝试这一步，我在不关闭innodb引擎的情况从471M降低到了70M）
performance_schema_max_table_instances=200
table_definition_cache=200
table_open_cache=128
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mysql 重启： /etc/init.d/mysqld restart
/etc/my.cnf配置如下
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
performance_schema_max_table_instances=200
table_definition_cache=200
table_open_cache=128
innodb=OFF
default-storage-engine=MYISAM
default-tmp-storage-engine=MYISAM
loose-innodb-trx=0
loose-innodb-locks=0
loose-innodb-lock-waits=0
loose-innodb-cmp=0
loose-innodb-cmp-per-index=0
loose-innodb-cmp-per-index-reset=0
loose-innodb-cmp-reset=0
loose-innodb-cmpmem=0
loose-innodb-cmpmem-reset=0
loose-innodb-buffer-page=0
loose-innodb-buffer-page-lru=0
loose-innodb-buffer-pool-stats=0
loose-innodb-metrics=0
loose-innodb-ft-default-stopword=0
loose-innodb-ft-inserted=0
loose-innodb-ft-deleted=0
loose-innodb-ft-being-deleted=0
loose-innodb-ft-config=0
loose-innodb-ft-index-cache=0
loose-innodb-ft-index-table=0
loose-innodb-sys-tables=0
loose-innodb-sys-tablestats=0
loose-innodb-sys-indexes=0
loose-innodb-sys-columns=0
loose-innodb-sys-fields=0
loose-innodb-sys-foreign=0
loose-innodb-sys-foreign-cols=0
MARK~
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