How to solve startup failure due to insufficient MySQL memory

MySQL How to solve startup failure due to insufficient memory

This article mainly introduces MySQL How to solve the problem of insufficient memory startup failure , The content is detailed and easy to understand , The operation is simple and fast , It has certain reference value , I believe that after reading this article MySQL How to solve the problem of insufficient memory and startup failure will be learned in this article , Let's have a look .

1. start-up MySQL I have been unsuccessful , 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 the query, there is insufficient memory , Look at the memory : /var/log/mysql/error.log

increase swap Swap space to solve problems :

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

4. Add auto mount : /var/log/mysql/error.log

 In the file /etc/fstab Add  /swapfile swap swap defaults 0 0

service mysql start  Successful launch 

5. remarks : Generate an empty file

dd if=/dev/zero of=1.txt bs=1M count=2  Generate an empty file of the specified size if= file name ： Input file name 
of= file name ： Output file name 
bs= Byte size 
count= Number 

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