利用MySQL系统数据库做性能负载诊断的方法

SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;
SELECT 
  database_name,
  SUM(compressed_size)/1024/1024 AS allocated_memory,
  SUM(data_size)/1024/1024 AS data_memory,
  SUM(is_hashed)*16/1024 AS is_hashed_memory,
  SUM(is_old)*16/1024 AS is_old_memory
FROM 
(
 SELECT 
  case when INSTR(TABLE_NAME,'.')>0 then replace(SUBSTRING(TABLE_NAME,1,INSTR(TABLE_NAME,'.')-1),'`','')
  else  'system_database' end as database_name,
  case when INSTR(TABLE_NAME,'.')>0 then replace(SUBSTRING(TABLE_NAME,INSTR(TABLE_NAME,'.')+1),'`','')
  ELSE 'system_obj' END AS table_name,
  if(compressed_size = 0, 16384, compressed_size) AS compressed_size,
  data_size,
  if(is_hashed = 'YES',1,0) is_hashed,
  if(is_old = 'YES',1,0) is_old
 FROM information_schema.innodb_buffer_page
 WHERE TABLE_NAME IS NOT NULL
) t
GROUP BY database_name
ORDER BY allocated_memory DESC
LIMIT 10;

SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;
SELECT 
 database_name,
 IFNULL(cast(sum(total_read) as signed),0) AS total_read,
 IFNULL(cast(sum(total_written) as signed),0) AS total_written,
 IFNULL(cast(sum(total) AS SIGNED),0) AS total_read_written
FROM
(
 SELECT 
  substring(REPLACE(file, '@@datadir/', ''),1,instr(REPLACE(file, '@@datadir/', ''),'/')-1) AS database_name,
  count_read,
  case 
   when instr(total_read,'KiB')>0 then replace(total_read,'KiB','')/1024
   when instr(total_read,'MiB')>0 then replace(total_read,'MiB','')/1024
   when instr(total_read,'GiB')>0 then replace(total_read,'GiB','')*1024
  END AS total_read,
  case 
   when instr(total_written,'KiB')>0 then replace(total_written,'KiB','')/1024
   when instr(total_written,'MiB')>0 then replace(total_written,'MiB','')
   when instr(total_written,'GiB')>0 then replace(total_written,'GiB','')*1024
  END AS total_written,
  case 
   when instr(total,'KiB')>0 then replace(total,'KiB','')/1024
   when instr(total,'MiB')>0 then replace(total,'MiB','')
   when instr(total,'GiB')>0 then replace(total,'GiB','')*1024
  END AS total
 from sys.io_global_by_file_by_bytes 
 WHERE FILE LIKE '%@@datadir%' AND instr(REPLACE(file, '@@datadir/', ''),'/')>0 
)t
GROUP BY database_name
ORDER BY total_read_written DESC;

SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;

SELECT 
 schema_name,
 digest_text,
 count_star,
 avg_timer_wait/1000000000000 AS avg_timer_wait,
 max_timer_wait/1000000000000 AS max_timer_wait,
 sum_lock_time/count_star/1000000000000 AS avg_lock_time ,
 sum_rows_affected/count_star AS avg_rows_affected,
 sum_rows_sent/count_star AS avg_rows_sent ,
 sum_rows_examined/count_star AS avg_rows_examined,
 sum_created_tmp_disk_tables/count_star AS avg_create_tmp_disk_tables,
 sum_created_tmp_tables/count_star AS avg_create_tmp_tables,
 sum_select_full_join/count_star AS avg_select_full_join,
 sum_select_full_range_join/count_star AS avg_select_full_range_join,
 sum_select_range/count_star AS avg_select_range,
 sum_select_range_check/count_star AS avg_select_range,
 first_seen,
 last_seen
FROM performance_schema.events_statements_summary_by_digest
WHERE last_seen>date_add(NOW(), interval -1 HOUR)
ORDER BY 
max_timer_wait
-- avg_timer_wait
-- sum_rows_affected/count_star 
-- sum_lock_time/count_star
-- avg_lock_time
-- avg_rows_sent
DESC
limit 10;

CREATE DEFINER=`root`@`%` PROCEDURE `create_test_data`(
 IN `loopcnt` INT
)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS SQL
SQL SECURITY DEFINER
COMMENT ''
BEGIN
 -- START TRANSACTION; 
  while loopcnt>0 do
   insert into test_mrr(rand_id,create_date) values (RAND()*100000000,now(6));
   set loopcnt=loopcnt-1;
  end while;
 -- commit;
END

SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;

select 
 schema_name,
 digest_text,
 count_star,
 first_seen,
 last_seen
from performance_schema.events_statements_summary_by_digest
where sum_errors>0 or sum_warnings>0 
order by last_seen desc;

SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;

SELECT SUBSTRING_INDEX(NAME, '/', 1) as wait_type,COUNT(1) 
FROM performance_schema.setup_instruments
GROUP BY 1 
ORDER BY 2 DESC;


SELECT
event_name,
count_star,
sum_timer_wait
FROM performance_schema.events_waits_summary_global_by_event_name
WHERE event_name != 'idle'
order by sum_timer_wait desc
limit 100;