How to solve MySQL startup failure due to insufficient memory

1. It has been unsuccessful when starting MySQL. Check the error log /var/log/mysql/error.log

2. The main error messages are as follows: /var/log/mysql/error.log

[ERROR] InnoDB: mmap(136151040 bytes) failed; errno 12
[ERROR] InnoDB: Cannot allocate memory for the buffer pool
[ERROR] InnoDB: Plugin initialization aborted with error Generic error
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Failed to initialize plugins.
[ERROR] Aborting

3. After querying, it is due to insufficient memory. Check the memory: /var/log/mysql/error .log

Increase swap space to solve the problem:

dd if=/dev/zero of=/swapfile bs=1M count=1024
mkswap /swapfile
swapon /swapfile

4. Add automatic mounting: /var/ log/mysql/error.log

在文件/etc/fstab中加入 /swapfile swap swap defaults 0 0

service mysql start 启动成功

5. Note: Generate empty file

dd if=/dev/zero of=1.txt bs=1M count=2 生成一个指定大小的空文件if=文件名：输入文件名
of=文件名：输出文件名
bs=字节大小
count=个数

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