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Linux创建swap交换分区

  • 2026-06-28 19:59:05
Linux创建swap交换分区

Swap 只是应急手段，不能替代物理内存。如果长期大量使用 Swap，虚拟机性能会严重下降。

不过有时候还是需要应急下的，下面是快速创建一个swap分区的方法：
# 创建文件dd if=/dev/zero of=/swapfile bs=1M count=8192# 设置权限并启用chmod 600 /swapfilemkswap /swapfileswapon /swapfile# 永久生效（写入 /etc/fstab）echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab
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  1. CONNECT:[ UseTime:0.000747s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000974s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000411s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000536s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000640s ]
  8. SELECT * FROM `article` WHERE `id` = 489165 LIMIT 1 [ RunTime:0.000440s ]
  9. UPDATE `article` SET `lasttime` = 1783129884 WHERE `id` = 489165 [ RunTime:0.009386s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000300s ]
  11. SELECT * FROM `article` WHERE `id` < 489165 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000582s ]
  12. SELECT * FROM `article` WHERE `id` > 489165 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000434s ]
  13. SELECT * FROM `article` WHERE `id` < 489165 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001128s ]
  14. SELECT * FROM `article` WHERE `id` < 489165 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007509s ]
  15. SELECT * FROM `article` WHERE `id` < 489165 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001818s ]
0.100809s