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Drop and recreate sys schema - no harm ?
Posted by: yvonne kire
Date: February 07, 2019 12:42PM

As I understand sys schema is new in 5.7.7 and above
it's a 'helper' schema to mostly used by performance schema
ie to keep track of historical data - true or false ?

I have MySQL 5.7.22 sys_config TABLESPACE ID miss match problem on many db servers.

I keeps crashing my 5.7 randomly - it tries to access sys.sys_config table and there is a miss match and it crash and restart mysql. I don't know what mysql try to do internaly to the sys schema that caused innodb to crash.


alter.log:
[ERROR] InnoDB: Failed to find tablespace for table `sys`.`sys_config` in the cache. Attempting to load the tablespace with space id 12282
[ERROR] InnoDB: In file './sys/sys_config.ibd', tablespace id and flags are 21 and 33, but in the InnoDB data dictionary they are 12282 and 33.
[ERROR] InnoDB: Operating system error number 2 in a file operation.
[ERROR] InnoDB: The error means the system cannot find the path specified.
[ERROR] InnoDB: Could not find a valid tablespace file for `sys/sys_config`.
[Warning] InnoDB: Cannot calculate statistics for table `sys`.`sys_config` because the .ibd file is missing.

BUT the file is there....

mysql> desc sys_config;
ERROR 1146 (42S02): Table 'sys.sys_config' doesn't exist


# cd /var/lib/mysql/sys/
# /var/lib/mysql/sys]# ls -atlhr sys_config.ibd
-rw-r----- 1 mysql mysql 96K Nov 22 15:05 sys_config.ibd


Current FIX
================

drop database sys ;
\! rm -fr /var/lib/mysql/sys
source /usr/share/percona-server/mysql_sys_schema.sql
desc sys.sys_config ;
select count(*) from sys.sys_config;


Anyone see any problem with this?

ie drop sys schema
and then create a blank new sys schema
(I know all past data will be lost but I don't need it)

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Drop and recreate sys schema - no harm ?
February 07, 2019 12:42PM


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