30、数据备份和性能管理

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原创最新推荐文章于 2026-09-04 12:46:16 发布 154 阅读 AI 写同款· GEO 优化 ›

手机存储空间不足？应用迁移SD卡全攻略移动设备存储管理是智能手机优化的关键技术，其核心原理是通过外置存储扩展解决内置空间不足问题。在Android系统中，应用迁移功能利用存储重定向技术，将应用数据从内部存储转移到SD卡。从工程实践角度看，选择UHS-I U3规格以上的高速SD卡至关重要，这类存储介质持续写入速度可达30MB/s以上，能有效降低性能损耗。典型应用场景包括游戏类、工具类等非实时性应用迁移，而微信等社交应用因频繁IO操作建议保留在内置存储。通过vivo手机实测，合理使用SD卡存储方案可使128GB设备延长1-2年使用寿命，特别适合摄影阅读详情

1、数据备份
命令行实用程序mysqldump
数据的导入和导出：
命令行实用程序mysqlhotcopy
The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

2、性能改善
索引index
利用操作系统的参数提高数据库的访问性能

mysql> explain select * from customers2 where cust_id = 10005;
+----+-------------+------------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table      | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+------------+------------+------+---------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | customers2 | NULL       | ALL  | NULL          | NULL | NULL    | NULL |    1 |   100.00 | Using where |
+----+-------------+------------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set (0.07 sec)

mysql> explain select * from customers where cust_id = 10005;
+----+-------------+-----------+------------+-------+---------------+---------+---------+-------+------+----------+-------+
| id | select_type | table     | partitions | type  | possible_keys | key     | key_len | ref   | rows | filtered | Extra |
+----+-------------+-----------+------------+-------+---------------+---------+---------+-------+------+----------+-------+
|  1 | SIMPLE      | customers | NULL       | const | PRIMARY,aa    | PRIMARY | 4       | const |    1 |   100.00 | NULL  |
+----+-------------+-----------+------------+-------+---------------+---------+---------+-------+------+----------+-------+
1 row in set (0.07 sec)