set @@log_slow_verbosity="";
select @@log_slow_filter;
@@log_slow_filter
admin,filesort,filesort_on_disk,filesort_priority_queue,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk
select @@log_slow_rate_limit;
@@log_slow_rate_limit
1
select @@log_slow_verbosity;
@@log_slow_verbosity

show variables like "log_slow%";
Variable_name	Value
log_slow_admin_statements	ON
log_slow_disabled_statements	sp
log_slow_filter	admin,filesort,filesort_on_disk,filesort_priority_queue,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk
log_slow_rate_limit	1
log_slow_slave_statements	ON
log_slow_verbosity	
set @org_slow_query_log= @@global.slow_query_log;
set @@log_slow_filter= "filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk,admin";
select @@log_slow_filter;
@@log_slow_filter
admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk
set @@log_slow_filter="admin,admin";
select @@log_slow_filter;
@@log_slow_filter
admin
set @@log_slow_filter=7;
select @@log_slow_filter;
@@log_slow_filter
admin,filesort,filesort_on_disk
set @@log_slow_filter= "filesort,impossible,impossible2,admin";
ERROR 42000: Variable 'log_slow_filter' can't be set to the value of 'impossible'
set @@log_slow_filter= "filesort, admin";
ERROR 42000: Variable 'log_slow_filter' can't be set to the value of ' admin'
set @@log_slow_filter= 1<<31;
ERROR 42000: Variable 'log_slow_filter' can't be set to the value of '2147483648'
select @@log_slow_filter;
@@log_slow_filter
admin,filesort,filesort_on_disk
set @@log_slow_verbosity= "query_plan,innodb";
select @@log_slow_verbosity;
@@log_slow_verbosity
innodb,query_plan
set @@log_slow_verbosity=1;
select @@log_slow_verbosity;
@@log_slow_verbosity
innodb
show fields from mysql.slow_log;
Field	Type	Null	Key	Default	Extra
start_time	timestamp(6)	NO		current_timestamp(6)	on update current_timestamp(6)
user_host	mediumtext	NO		NULL	
query_time	time(6)	NO		NULL	
lock_time	time(6)	NO		NULL	
rows_sent	int(11)	NO		NULL	
rows_examined	int(11)	NO		NULL	
db	varchar(512)	NO		NULL	
last_insert_id	int(11)	NO		NULL	
insert_id	int(11)	NO		NULL	
server_id	int(10) unsigned	NO		NULL	
sql_text	mediumtext	NO		NULL	
thread_id	bigint(21) unsigned	NO		NULL	
rows_affected	int(11)	NO		NULL	
flush slow logs;
set long_query_time=0.1;
set log_slow_filter='';
set global slow_query_log=1;
set global log_output='TABLE';
select sleep(0.5);
sleep(0.5)
0
select count(*) FROM mysql.slow_log;
count(*)
1
set @@long_query_time=default;
set global slow_query_log= @org_slow_query_log;
set @@log_slow_filter=default;
set @@log_slow_verbosity=default;
set global log_output= default;
truncate mysql.slow_log;
#
# MDEV-18333 Slow_queries count doesn't increase when slow_query_log is turned off
#
SET SESSION slow_query_log=OFF;
SET GLOBAL slow_query_log=OFF;
SET long_query_time=0.1;
# Although this query is disallowed by slow_query_log, it should still increment Slow_queries
SELECT VARIABLE_VALUE INTO @global_slow_queries
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='SLOW_QUERIES';
SELECT sleep(0.2) INTO @tmp FROM DUAL;
SELECT
CAST(VARIABLE_VALUE AS UNSIGNED)-@global_slow_queries AS Slow_queries_increment
FROM
INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE
VARIABLE_NAME='SLOW_QUERIES';
Slow_queries_increment
1
# Although this query is disallowed by log_slow_filter, it should still increment Slow_queries
SET log_slow_filter=filesort;
SELECT sleep(0.2) INTO @tmp FROM DUAL;
SELECT VARIABLE_VALUE INTO @global_slow_queries
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='SLOW_QUERIES';
SELECT sleep(0.2) INTO @tmp FROM DUAL;
SELECT
CAST(VARIABLE_VALUE AS UNSIGNED)-@global_slow_queries AS Slow_queries_increment
FROM
INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE
VARIABLE_NAME='SLOW_QUERIES';
Slow_queries_increment
1
SET log_slow_filter=DEFAULT;
SET @@long_query_time=default;
SET GLOBAL slow_query_log= @org_slow_query_log;