一、系统表空间扩容方法方法1：在innodb_data_file_path参数后面加上autoextend参数innodb_data_file_path=ibdata1:12M:autoextend方法2：在innodb_data_file_path参数后面加上一个新的数据文件innodb_data_file_path = /ibdata/ibdata1:988M;/disk2/ibdata2:50M:autoextend二、操作步骤1. 修改参数innodb_data_file_path2. 关闭数据库，shutdown3. 启动数据库，mysqld_safe &4. 验证参数是否生效show variables like 'innodb_data_file_path';三、案例1. 查看默认参数mysql> show variables like 'innodb_data%';+-----------------------+------------------------+| Variable_name | Value |+-----------------------+------------------------+| innodb_data_file_path | ibdata1:12M:autoextend || innodb_data_home_dir | /zxdata/my3311/data |+-----------------------+------------------------+2 rows in set (0.00 sec)2.关闭数据库mysql>shutdown;3.修改my.cnf参数文件[root@roidb1 ~]# grep "path" /zxdata/my3311/etc/my.cnfinnodb_data_file_path = ibdata1:12M;ibdata2:50M:autoextend4.启动数据库#/usr/local/mysql/bin/mysqld_safe --defaults-file=/zxdata/my3311/etc/my.cnf &5.验证是否生效mysql> show variables like 'innodb_data%';+-----------------------+------------------------------------+| Variable_name | Value |+-----------------------+------------------------------------+| innodb_data_file_path | ibdata1:12M;ibdata2:50M:autoextend || innodb_data_home_dir | /zxdata/my3311/data |+-----------------------+------------------------------------+2 rows in set (0.01 sec)