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use mysql;
SET @old_log_output = @@global.log_output;
SET GLOBAL log_output="FILE,TABLE";
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 unsigned NOT NULL,
`server_id` int unsigned NOT NULL,
`command_type` varchar(64) NOT NULL,
`argument` mediumblob NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8mb3 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 NOT NULL,
`rows_examined` int NOT NULL,
`db` varchar(512) NOT NULL,
`last_insert_id` int NOT NULL,
`insert_id` int NOT NULL,
`server_id` int unsigned NOT NULL,
`sql_text` mediumblob NOT NULL,
`thread_id` bigint unsigned NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8mb3 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 unsigned NOT NULL,
`server_id` int unsigned NOT NULL,
`command_type` varchar(64) NOT NULL,
`argument` mediumblob NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb3 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 NOT NULL,
`rows_examined` int NOT NULL,
`db` varchar(512) NOT NULL,
`last_insert_id` int NOT NULL,
`insert_id` int NOT NULL,
`server_id` int unsigned NOT NULL,
`sql_text` mediumblob NOT NULL,
`thread_id` bigint unsigned NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb3 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';
SET GLOBAL log_output=@old_log_output;
TRUNCATE TABLE mysql.general_log;
use test;
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