use mysql;
truncate table general_log;
select * from general_log;
event_time	user_host	thread_id	server_id	command_type	argument
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from general_log
truncate table slow_log;
select * from slow_log;
start_time	user_host	query_time	lock_time	rows_sent	rows_examined	db	last_insert_id	insert_id	server_id	sql_text	thread_id
alter table mysql.general_log engine=myisam;
ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
alter table mysql.slow_log engine=myisam;
ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
drop table mysql.general_log;
ERROR HY000: You cannot 'DROP' a log table if logging is enabled
drop table mysql.slow_log;
ERROR HY000: You cannot 'DROP' a log table if logging is enabled
set global general_log='OFF';
alter table mysql.slow_log engine=myisam;
ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
set global slow_query_log='OFF';
show create table mysql.general_log;
Table	Create Table
general_log	CREATE TABLE `general_log` (
  `event_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
  `user_host` mediumtext NOT NULL,
  `thread_id` bigint(21) unsigned NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `command_type` varchar(64) NOT NULL,
  `argument` mediumblob NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log'
show create table mysql.slow_log;
Table	Create Table
slow_log	CREATE TABLE `slow_log` (
  `start_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
  `user_host` mediumtext NOT NULL,
  `query_time` time(6) NOT NULL,
  `lock_time` time(6) NOT NULL,
  `rows_sent` int(11) NOT NULL,
  `rows_examined` int(11) NOT NULL,
  `db` varchar(512) NOT NULL,
  `last_insert_id` int(11) NOT NULL,
  `insert_id` int(11) NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `sql_text` mediumblob NOT NULL,
  `thread_id` bigint(21) unsigned NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log'
alter table mysql.general_log engine=myisam;
alter table mysql.slow_log engine=myisam;
show create table mysql.general_log;
Table	Create Table
general_log	CREATE TABLE `general_log` (
  `event_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
  `user_host` mediumtext NOT NULL,
  `thread_id` bigint(21) unsigned NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `command_type` varchar(64) NOT NULL,
  `argument` mediumblob NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='General log'
show create table mysql.slow_log;
Table	Create Table
slow_log	CREATE TABLE `slow_log` (
  `start_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
  `user_host` mediumtext NOT NULL,
  `query_time` time(6) NOT NULL,
  `lock_time` time(6) NOT NULL,
  `rows_sent` int(11) NOT NULL,
  `rows_examined` int(11) NOT NULL,
  `db` varchar(512) NOT NULL,
  `last_insert_id` int(11) NOT NULL,
  `insert_id` int(11) NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `sql_text` mediumblob NOT NULL,
  `thread_id` bigint(21) unsigned NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='Slow log'
set global general_log='ON';
set global slow_query_log='ON';
select * from mysql.general_log;
event_time	user_host	thread_id	server_id	command_type	argument
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from general_log
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	truncate table slow_log
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from slow_log
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	alter table mysql.general_log engine=myisam
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	alter table mysql.slow_log engine=myisam
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	drop table mysql.general_log
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	drop table mysql.slow_log
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set global general_log='OFF'
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	set global slow_query_log='ON'
TIMESTAMP	USER_HOST	THREAD_ID	1	Query	select * from mysql.general_log
flush logs;
lock tables mysql.general_log WRITE;
ERROR HY000: You can't use locks with log tables.
lock tables mysql.slow_log WRITE;
ERROR HY000: You can't use locks with log tables.
lock tables mysql.general_log READ;
ERROR HY000: You can't use locks with log tables.
lock tables mysql.slow_log READ;
ERROR HY000: You can't use locks with log tables.
set global general_log='OFF';
set global slow_query_log='OFF';
set @save_storage_engine= @@session.default_storage_engine;
set default_storage_engine= MEMORY;
alter table mysql.slow_log engine=NonExistentEngine;
ERROR 42000: Unknown storage engine 'NonExistentEngine'
alter table mysql.slow_log engine=memory;
ERROR HY000: This storage engine cannot be used for log tables
set default_storage_engine= @save_storage_engine;
drop table mysql.slow_log;
drop table mysql.general_log;
drop table mysql.general_log;
ERROR 42S02: Unknown table 'mysql.general_log'
drop table mysql.slow_log;
ERROR 42S02: Unknown table 'mysql.slow_log'
CREATE TABLE `general_log` (
`event_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6)
ON UPDATE CURRENT_TIMESTAMP(6),
`user_host` mediumtext NOT NULL,
`thread_id` bigint(21) unsigned NOT NULL,
`server_id` int(10) unsigned NOT NULL,
`command_type` varchar(64) NOT NULL,
`argument` mediumblob NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
CREATE TABLE `slow_log` (
`start_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6)
ON UPDATE CURRENT_TIMESTAMP(6),
`user_host` mediumtext NOT NULL,
`query_time` time(6) NOT NULL,
`lock_time` time(6) NOT NULL,
`rows_sent` int(11) NOT NULL,
`rows_examined` int(11) NOT NULL,
`db` varchar(512) NOT NULL,
`last_insert_id` int(11) NOT NULL,
`insert_id` int(11) NOT NULL,
`server_id` int(10) unsigned NOT NULL,
`sql_text` mediumblob NOT NULL,
`thread_id` bigint(21) unsigned NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
set global general_log='ON';
set global slow_query_log='ON';
use test;