# \[ERROR\] Failed to write to mysql.slow\_log

**URL:** <https://forums.percona.com/t/error-failed-to-write-to-mysql-slow-log/5699>\
**Category:** Other MySQL® Questions\
**Created:** [June 26, 2017, 9:04pm UTC](https://forums.percona.com/t/error-failed-to-write-to-mysql-slow-log/5699 "2017-06-26T21:04:35Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![csxuedn](https://avatars.discourse-cdn.com/v4/letter/c/b3f665/32.png) [@csxuedn](https://forums.percona.com/u/csxuedn)\
**Post date:** [June 26, 2017, 9:04pm UTC](https://forums.percona.com/t/error-failed-to-write-to-mysql-slow-log/5699/1 "2017-06-26T21:04:35Z")

</div>

[ERROR] Failed to write to mysql.slow\_log

I have a mysql server5.6.  
mysql\> set global log\_output = ‘TABLE’;

Always output error information to the error log file. [ERROR] Failed to write to mysql.slow\_log.I have no problem with disk and memory and os,Is there any other reason？

---

<div class="post-metadata">

**Author:** ![mirfan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/mirfan/32/16890_2.png) [@mirfan](https://forums.percona.com/u/mirfan)\
**Post date:** [June 30, 2017, 1:20am UTC](https://forums.percona.com/t/error-failed-to-write-to-mysql-slow-log/5699/2 "2017-06-30T01:20:41Z")

</div>

This error could occur for many reasons e.g. out of memory, disk space etc. Do you have mysql.slow\_log table exists on disk ? There are few bugs exists too. What exact version you are using ?

> [@](#):
>
> mysql\> USE mysql;  
> mysql\> SHOW TABLES LIKE ‘%slow%’;  
> mysql\> SHOW VARIABLES LIKE ‘%version%’;