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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;
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