查看mysql正在执行的SQL语句，使用profile分析SQL执行状态
2015-07-28 11:09
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1)我们先通过status命令查看Mysql运行状态
mysql> status;
--------------
mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1
Connection id: 113752
Current database: information_schema
Current user: push_user@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.73 Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: utf8
Client characterset: latin1
Conn. characterset: latin1
UNIX socket: /tmp/mysql.sock
Uptime: 22 days 8 hours 31 min 23 sec
Threads: 38 Questions: 1037751897 Slow queries: 2356 Opens: 79836 Flush tables: 1 Open tables: 64 Queries per second avg: 537.282
--------------
在上面显示列表的最后一条，我们来查看Slow queries这一项的值，如果多次查看的值大于0的话,说明有些查询sql命令执行时间过长。
2)这时再通过show processlist命令来查看当前正在运行的SQL，从中找出运行慢的SQL语句，找到执行慢的语句后，再用explain命令查看这些语句的执行计划。
mysql> show processlist;
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
| 50270 | ambari | DataBase-01:41512 | ambari | Sleep | 23 | | NULL |
| 50271 | ambari | DataBase-01:41511 | ambari | Sleep | 6 | | NULL |
| 50272 | ambari | DataBase-01:41514 | ambari | Sleep | 23 | | NULL |
| 62452 | oozie | DataBase-02:42987 | oozie | Sleep | 25 | | NULL |
| 63660 | ambari | DataBase-01:56052 | ambari | Sleep | 0 | | NULL |
| 110404 | push_user | localhost:33817 | quartz | Sleep | 12 | | NULL |
| 112835 | push_user | localhost:46571 | hibernate | Sleep | 1 | | NULL |
| 113163 | push_user | localhost:56585 | hibernate | Sleep | 1 | | NULL |
| 113289 | push_user | 14.118.132.20:47333 | DW | Sleep | 628 | | NULL |
| 113320 | push_user | localhost:47428 | hibernate | Sleep | 3 | | NULL |
| 113321 | push_user | localhost:47429 | hibernate | Sleep | 3 | | NULL |
| 113322 | push_user | localhost:47430 | hibernate | Sleep | 3 | | NULL |
| 113357 | push_user | localhost:52337 | hibernate | Sleep | 3 | | NULL |
| 113364 | push_user | localhost:57206 | hibernate | Sleep | 3 | | NULL |
| 113366 | push_user | localhost:34813 | hibernate | Sleep | 1 | | NULL |
| 113398 | push_user | localhost:37382 | hibernate | Sleep | 1 | | NULL |
| 113498 | push_user | localhost:47626 | quartz | Sleep | 12717 | | NULL |
| 113709 | push_user | localhost:59382 | hibernate | Sleep | 1 | | NULL |
| 113710 | push_user | localhost:33627 | hibernate | Sleep | 1 | | NULL |
| 113715 | hive | DataBase-02:54968 | hive | Sleep | 2390 | | NULL |
| 113716 | hive | DataBase-02:54969 | hive | Sleep | 2390 | | NULL |
| 113717 | hive | DataBase-02:54974 | hive | Sleep | 2336 | | NULL |
| 113718 | hive | DataBase-02:54975 | hive | Sleep | 2336 | | NULL |
| 113719 | push_user | localhost:48243 | hibernate | Sleep | 1 | | NULL |
| 113720 | push_user | localhost:48245 | hibernate | Sleep | 1 | | NULL |
| 113721 | push_user | localhost:48244 | hibernate | Sleep | 1 | | NULL |
| 113722 | push_user | localhost:48247 | hibernate | Sleep | 1 | | NULL |
| 113723 | push_user | localhost:48249 | hibernate | Sleep | 1 | | NULL |
| 113724 | push_user | localhost:48248 | hibernate | Sleep | 1 | | NULL |
| 113745 | push_user | localhost:50684 | hibernate | Sleep | 1 | | NULL |
| 113746 | push_user | localhost:50685 | hibernate | Sleep | 1 | | NULL |
| 113747 | push_user | localhost:50695 | hibernate | Sleep | 1 | | NULL |
| 113748 | push_user | localhost:50696 | hibernate | Sleep | 1 | | NULL |
| 113749 | push_user | localhost:50697 | hibernate | Sleep | 1 | | NULL |
| 113750 | push_user | localhost:50699 | hibernate | Sleep | 1 | | NULL |
| 113751 | push_user | localhost:50700 | hibernate | Sleep | 1 | | NULL |
| 113752 | push_user | localhost | information_schema | Query | 0 | NULL | show processlist |
| 113753 | push_user | 14.118.132.20:28688 | DW | Sleep | 396 | | NULL |
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
38 rows in set (0.00 sec)
或者通过如下命令查询:
mysql> use information_schema;
mysql> select * from PROCESSLIST where info is not null;
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
| ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO |
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
| 113752 | push_user | localhost | information_schema | Query | 0 | executing | select * from PROCESSLIST where info is not null |
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
1 row in set (0.00 sec)
MySQL使用profile分析SQL执行状态
打开profile
mysql> select @@have_profiling;
+------------------+
| @@have_profiling |
+------------------+
| YES |
+------------------+
1 row in set (0.00 sec)
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 0 |
+-------------+
1 row in set (0.00 sec)
mysql> set session profiling=1;
Query OK, 0 rows affected (0.00 sec)
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 1 |
+-------------+
1 row in set (0.00 sec)
使用profile分析SQL，可以看到执行两次后,Send data和sending cached result to clien执行效率的变化
mysql> select count(*) from sakila.payment;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.03 sec)
mysql> show profiles;
+----------+------------+-------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------+
| 1 | 0.00020400 | select @@profiling |
| 2 | 0.00008900 | select count(*) from payment |
| 3 | 0.00006800 | show databaes |
| 4 | 0.02102800 | show databases |
| 5 | 0.02847600 | select count(*) from sakila.payment |
+----------+------------+-------------------------------------+
5 rows in set (0.00 sec)
mysql> show profile for query 5;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000030 |
| Waiting for query cache lock | 0.000005 |
| checking query cache for query | 0.000043 |
| checking permissions | 0.000007 |
| Opening tables | 0.000027 |
| System lock | 0.000010 |
| Waiting for query cache lock | 0.000010 |
| init | 0.000000 |
| optimizing | 0.023255 |
| statistics | 0.000118 |
| preparing | 0.000041 |
| executing | 0.000033 |
| Sending data | 0.003833 |
| end | 0.000054 |
| query end | 0.000045 |
| closing tables | 0.000045 |
| freeing items | 0.000072 |
| Waiting for query cache lock | 0.000033 |
| freeing items | 0.000785 |
| Waiting for query cache lock | 0.000016 |
| freeing items | 0.000002 |
| storing result in query cache | 0.000005 |
| logging slow query | 0.000003 |
| cleaning up | 0.000004 |
+--------------------------------+----------+
24 rows in set (0.00 sec)
mysql> select count(*) from sakila.payment;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.00 sec)
mysql> show profiles;
+----------+------------+-------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------+
| 1 | 0.00020400 | select @@profiling |
| 2 | 0.00008900 | select count(*) from payment |
| 3 | 0.00006800 | show databaes |
| 4 | 0.02102800 | show databases |
| 5 | 0.02847600 | select count(*) from sakila.payment |
| 6 | 0.00006900 | select count(*) from sakila.payment |
+----------+------------+-------------------------------------+
6 rows in set (0.00 sec)
mysql> show profile for query 6;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000029 |
| Waiting for query cache lock | 0.000004 |
| checking query cache for query | 0.000007 |
| checking privileges on cached | 0.000004 |
| checking permissions | 0.000008 |
| sending cached result to clien | 0.000012 |
| logging slow query | 0.000002 |
| cleaning up | 0.000003 |
+--------------------------------+----------+
8 rows in set (0.00 sec)
sending data比较耗费cpu
mysql> select min(seq) seq,state,count(*) numb_ops,
-> round(sum(duration),5) sum_dur, round(avg(duration),5) avg_dur,
-> round(sum(cpu_user),5) sum_cpu, round(avg(cpu_user),5) avg_cpu
-> from information_schema.profiling
-> where query_id = 5
-> group by state
-> order by seq;
+------+--------------------------------+----------+---------+---------+---------+---------+
| seq | state | numb_ops | sum_dur | avg_dur | sum_cpu | avg_cpu |
+------+--------------------------------+----------+---------+---------+---------+---------+
| 2 | starting | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 3 | Waiting for query cache lock | 4 | 0.00006 | 0.00002 | 0.00100 | 0.00025 |
| 4 | checking query cache for query | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 |
| 5 | checking permissions | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 6 | Opening tables | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 7 | System lock | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 9 | init | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
| 10 | optimizing | 1 | 0.02326 | 0.02326 | 0.00000 | 0.00000 |
| 11 | statistics | 1 | 0.00012 | 0.00012 | 0.00000 | 0.00000 |
| 12 | preparing | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 |
| 13 | executing | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 14 | Sending data | 1 | 0.00383 | 0.00383 | 0.00300 | 0.00300 |
| 15 | end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 16 | query end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 17 | closing tables | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 18 | freeing items | 3 | 0.00086 | 0.00029 | 0.00000 | 0.00000 |
| 23 | storing result in query cache | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 24 | logging slow query | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
| 25 | cleaning up | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
+------+--------------------------------+----------+---------+---------+---------+---------+
19 rows in set (0.00 sec)
mysql> show profile cpu for query 5;
+--------------------------------+----------+----------+------------+
| Status | Duration | CPU_user | CPU_system |
+--------------------------------+----------+----------+------------+
| starting | 0.000030 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000005 | 0.000000 | 0.000000 |
| checking query cache for query | 0.000043 | 0.000000 | 0.000000 |
| checking permissions | 0.000007 | 0.000000 | 0.000000 |
| Opening tables | 0.000027 | 0.000000 | 0.000000 |
| System lock | 0.000010 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000010 | 0.001000 | 0.000000 |
| init | 0.000000 | 0.000000 | 0.000000 |
| optimizing | 0.023255 | 0.000000 | 0.000000 |
| statistics | 0.000118 | 0.000000 | 0.000000 |
| preparing | 0.000041 | 0.000000 | 0.000000 |
| executing | 0.000033 | 0.000000 | 0.000000 |
| Sending data | 0.003833 | 0.002999 | 0.001000 |
| end | 0.000054 | 0.000000 | 0.000000 |
| query end | 0.000045 | 0.000000 | 0.000000 |
| closing tables | 0.000045 | 0.000000 | 0.000000 |
| freeing items | 0.000072 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000033 | 0.000000 | 0.000000 |
| freeing items | 0.000785 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000016 | 0.000000 | 0.000000 |
| freeing items | 0.000002 | 0.000000 | 0.000000 |
| storing result in query cache | 0.000005 | 0.000000 | 0.000000 |
| logging slow query | 0.000003 | 0.000000 | 0.000000 |
| cleaning up | 0.000004 | 0.000000 | 0.000000 |
+--------------------------------+----------+----------+------------+
24 rows in set (0.00 sec)
mysql> show profile block io for query 5;
+--------------------------------+----------+--------------+---------------+
| Status | Duration | Block_ops_in | Block_ops_out |
+--------------------------------+----------+--------------+---------------+
| starting | 0.000030 | 0 | 0 |
| Waiting for query cache lock | 0.000005 | 0 | 0 |
| checking query cache for query | 0.000043 | 0 | 0 |
| checking permissions | 0.000007 | 0 | 0 |
| Opening tables | 0.000027 | 0 | 0 |
| System lock | 0.000010 | 0 | 0 |
| Waiting for query cache lock | 0.000010 | 0 | 0 |
| init | 0.000000 | 0 | 0 |
| optimizing | 0.023255 | 0 | 0 |
| statistics | 0.000118 | 0 | 0 |
| preparing | 0.000041 | 0 | 0 |
| executing | 0.000033 | 0 | 0 |
| Sending data | 0.003833 | 0 | 0 |
| end | 0.000054 | 0 | 0 |
| query end | 0.000045 | 0 | 0 |
| closing tables | 0.000045 | 0 | 0 |
| freeing items | 0.000072 | 0 | 0 |
| Waiting for query cache lock | 0.000033 | 0 | 0 |
| freeing items | 0.000785 | 0 | 0 |
| Waiting for query cache lock | 0.000016 | 0 | 0 |
| freeing items | 0.000002 | 0 | 0 |
| storing result in query cache | 0.000005 | 0 | 0 |
| logging slow query | 0.000003 | 0 | 0 |
| cleaning up | 0.000004 | 0 | 0 |
+--------------------------------+----------+--------------+---------------+
24 rows in set (0.00 sec)
再看同结构数据的MyISAM表
mysql> create table payment_myisam like payment;
Query OK, 0 rows affected (0.03 sec)
mysql> alter table payment_myisam engine=myisam;
Query OK, 0 rows affected (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table payment_myisam\G
*************************** 1. row ***************************
Table: payment_myisam
Create Table: CREATE TABLE `payment_myisam` (
`payment_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`customer_id` smallint(5) unsigned NOT NULL,
`staff_id` tinyint(3) unsigned NOT NULL,
`rental_id` int(11) DEFAULT NULL,
`amount` decimal(5,2) NOT NULL,
`payment_date` datetime NOT NULL,
`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`payment_id`),
KEY `idx_fk_staff_id` (`staff_id`),
KEY `idx_fk_customer_id` (`customer_id`),
KEY `fk_payment_rental` (`rental_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
mysql> insert into payment_myisam select * from payment;
Query OK, 16049 rows affected (0.10 sec)
Records: 16049 Duplicates: 0 Warnings: 0
mysql> select count(*) from payment_myisam;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.01 sec)
mysql> show profiles;
| 23 | 0.09449600 | insert into payment_myisam select * from payment |
| 24 | 0.00023500 | select count(*) from payment_myisam |
15 rows in set (0.00 sec)
mysql> show profile for query 24;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000026 |
| Waiting for query cache lock | 0.000003 |
| checking query cache for query | 0.000037 |
| checking permissions | 0.000006 |
| Opening tables | 0.000015 |
| System lock | 0.000009 |
| Waiting for query cache lock | 0.000019 |
| init | 0.000011 |
| optimizing | 0.000006 |
| executing | 0.000006 |
| end | 0.000000 |
| query end | 0.000001 |
| closing tables | 0.000008 |
| freeing items | 0.000019 |
| Waiting for query cache lock | 0.000008 |
| freeing items | 0.000013 |
| Waiting for query cache lock | 0.000008 |
| freeing items | 0.000008 |
| storing result in query cache | 0.000015 |
| logging slow query | 0.000008 |
| cleaning up | 0.000009 |
+--------------------------------+----------+
1)我们先通过status命令查看Mysql运行状态
mysql> status;
--------------
mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1
Connection id: 113752
Current database: information_schema
Current user: push_user@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.73 Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: utf8
Client characterset: latin1
Conn. characterset: latin1
UNIX socket: /tmp/mysql.sock
Uptime: 22 days 8 hours 31 min 23 sec
Threads: 38 Questions: 1037751897 Slow queries: 2356 Opens: 79836 Flush tables: 1 Open tables: 64 Queries per second avg: 537.282
--------------
在上面显示列表的最后一条，我们来查看Slow queries这一项的值，如果多次查看的值大于0的话,说明有些查询sql命令执行时间过长。
2)这时再通过show processlist命令来查看当前正在运行的SQL，从中找出运行慢的SQL语句，找到执行慢的语句后，再用explain命令查看这些语句的执行计划。
mysql> show processlist;
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
| 50270 | ambari | DataBase-01:41512 | ambari | Sleep | 23 | | NULL |
| 50271 | ambari | DataBase-01:41511 | ambari | Sleep | 6 | | NULL |
| 50272 | ambari | DataBase-01:41514 | ambari | Sleep | 23 | | NULL |
| 62452 | oozie | DataBase-02:42987 | oozie | Sleep | 25 | | NULL |
| 63660 | ambari | DataBase-01:56052 | ambari | Sleep | 0 | | NULL |
| 110404 | push_user | localhost:33817 | quartz | Sleep | 12 | | NULL |
| 112835 | push_user | localhost:46571 | hibernate | Sleep | 1 | | NULL |
| 113163 | push_user | localhost:56585 | hibernate | Sleep | 1 | | NULL |
| 113289 | push_user | 14.118.132.20:47333 | DW | Sleep | 628 | | NULL |
| 113320 | push_user | localhost:47428 | hibernate | Sleep | 3 | | NULL |
| 113321 | push_user | localhost:47429 | hibernate | Sleep | 3 | | NULL |
| 113322 | push_user | localhost:47430 | hibernate | Sleep | 3 | | NULL |
| 113357 | push_user | localhost:52337 | hibernate | Sleep | 3 | | NULL |
| 113364 | push_user | localhost:57206 | hibernate | Sleep | 3 | | NULL |
| 113366 | push_user | localhost:34813 | hibernate | Sleep | 1 | | NULL |
| 113398 | push_user | localhost:37382 | hibernate | Sleep | 1 | | NULL |
| 113498 | push_user | localhost:47626 | quartz | Sleep | 12717 | | NULL |
| 113709 | push_user | localhost:59382 | hibernate | Sleep | 1 | | NULL |
| 113710 | push_user | localhost:33627 | hibernate | Sleep | 1 | | NULL |
| 113715 | hive | DataBase-02:54968 | hive | Sleep | 2390 | | NULL |
| 113716 | hive | DataBase-02:54969 | hive | Sleep | 2390 | | NULL |
| 113717 | hive | DataBase-02:54974 | hive | Sleep | 2336 | | NULL |
| 113718 | hive | DataBase-02:54975 | hive | Sleep | 2336 | | NULL |
| 113719 | push_user | localhost:48243 | hibernate | Sleep | 1 | | NULL |
| 113720 | push_user | localhost:48245 | hibernate | Sleep | 1 | | NULL |
| 113721 | push_user | localhost:48244 | hibernate | Sleep | 1 | | NULL |
| 113722 | push_user | localhost:48247 | hibernate | Sleep | 1 | | NULL |
| 113723 | push_user | localhost:48249 | hibernate | Sleep | 1 | | NULL |
| 113724 | push_user | localhost:48248 | hibernate | Sleep | 1 | | NULL |
| 113745 | push_user | localhost:50684 | hibernate | Sleep | 1 | | NULL |
| 113746 | push_user | localhost:50685 | hibernate | Sleep | 1 | | NULL |
| 113747 | push_user | localhost:50695 | hibernate | Sleep | 1 | | NULL |
| 113748 | push_user | localhost:50696 | hibernate | Sleep | 1 | | NULL |
| 113749 | push_user | localhost:50697 | hibernate | Sleep | 1 | | NULL |
| 113750 | push_user | localhost:50699 | hibernate | Sleep | 1 | | NULL |
| 113751 | push_user | localhost:50700 | hibernate | Sleep | 1 | | NULL |
| 113752 | push_user | localhost | information_schema | Query | 0 | NULL | show processlist |
| 113753 | push_user | 14.118.132.20:28688 | DW | Sleep | 396 | | NULL |
+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+
38 rows in set (0.00 sec)
或者通过如下命令查询:
mysql> use information_schema;
mysql> select * from PROCESSLIST where info is not null;
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
| ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO |
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
| 113752 | push_user | localhost | information_schema | Query | 0 | executing | select * from PROCESSLIST where info is not null |
+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+
1 row in set (0.00 sec)
MySQL使用profile分析SQL执行状态
打开profilemysql> select @@have_profiling;
+------------------+
| @@have_profiling |
+------------------+
| YES |
+------------------+
1 row in set (0.00 sec)
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 0 |
+-------------+
1 row in set (0.00 sec)
mysql> set session profiling=1;
Query OK, 0 rows affected (0.00 sec)
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 1 |
+-------------+
1 row in set (0.00 sec)
mysql> select @@have_profiling; +------------------+ | @@have_profiling | +------------------+ | YES | +------------------+ 1 row in set (0.00 sec) mysql> select @@profiling; +-------------+ | @@profiling | +-------------+ | 0 | +-------------+ 1 row in set (0.00 sec) mysql> set session profiling=1; Query OK, 0 rows affected (0.00 sec) mysql> select @@profiling; +-------------+ | @@profiling | +-------------+ | 1 | +-------------+ 1 row in set (0.00 sec)
使用profile分析SQL，可以看到执行两次后,Send data和sending cached result to clien执行效率的变化
mysql> select count(*) from sakila.payment;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.03 sec)
mysql> show profiles;
+----------+------------+-------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------+
| 1 | 0.00020400 | select @@profiling |
| 2 | 0.00008900 | select count(*) from payment |
| 3 | 0.00006800 | show databaes |
| 4 | 0.02102800 | show databases |
| 5 | 0.02847600 | select count(*) from sakila.payment |
+----------+------------+-------------------------------------+
5 rows in set (0.00 sec)
mysql> select count(*) from sakila.payment; +----------+ | count(*) | +----------+ | 16049 | +----------+ 1 row in set (0.03 sec) mysql> show profiles; +----------+------------+-------------------------------------+ | Query_ID | Duration | Query | +----------+------------+-------------------------------------+ | 1 | 0.00020400 | select @@profiling | | 2 | 0.00008900 | select count(*) from payment | | 3 | 0.00006800 | show databaes | | 4 | 0.02102800 | show databases | | 5 | 0.02847600 | select count(*) from sakila.payment | +----------+------------+-------------------------------------+ 5 rows in set (0.00 sec)
mysql> show profile for query 5;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000030 |
| Waiting for query cache lock | 0.000005 |
| checking query cache for query | 0.000043 |
| checking permissions | 0.000007 |
| Opening tables | 0.000027 |
| System lock | 0.000010 |
| Waiting for query cache lock | 0.000010 |
| init | 0.000000 |
| optimizing | 0.023255 |
| statistics | 0.000118 |
| preparing | 0.000041 |
| executing | 0.000033 |
| Sending data | 0.003833 |
| end | 0.000054 |
| query end | 0.000045 |
| closing tables | 0.000045 |
| freeing items | 0.000072 |
| Waiting for query cache lock | 0.000033 |
| freeing items | 0.000785 |
| Waiting for query cache lock | 0.000016 |
| freeing items | 0.000002 |
| storing result in query cache | 0.000005 |
| logging slow query | 0.000003 |
| cleaning up | 0.000004 |
+--------------------------------+----------+
24 rows in set (0.00 sec)
mysql> select count(*) from sakila.payment;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.00 sec)
mysql> show profiles;
+----------+------------+-------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------+
| 1 | 0.00020400 | select @@profiling |
| 2 | 0.00008900 | select count(*) from payment |
| 3 | 0.00006800 | show databaes |
| 4 | 0.02102800 | show databases |
| 5 | 0.02847600 | select count(*) from sakila.payment |
| 6 | 0.00006900 | select count(*) from sakila.payment |
+----------+------------+-------------------------------------+
6 rows in set (0.00 sec)
mysql> show profile for query 6;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000029 |
| Waiting for query cache lock | 0.000004 |
| checking query cache for query | 0.000007 |
| checking privileges on cached | 0.000004 |
| checking permissions | 0.000008 |
| sending cached result to clien | 0.000012 |
| logging slow query | 0.000002 |
| cleaning up | 0.000003 |
+--------------------------------+----------+
8 rows in set (0.00 sec)
mysql> show profile for query 5; +--------------------------------+----------+ | Status | Duration | +--------------------------------+----------+ | starting | 0.000030 | | Waiting for query cache lock | 0.000005 | | checking query cache for query | 0.000043 | | checking permissions | 0.000007 | | Opening tables | 0.000027 | | System lock | 0.000010 | | Waiting for query cache lock | 0.000010 | | init | 0.000000 | | optimizing | 0.023255 | | statistics | 0.000118 | | preparing | 0.000041 | | executing | 0.000033 | | Sending data | 0.003833 | | end | 0.000054 | | query end | 0.000045 | | closing tables | 0.000045 | | freeing items | 0.000072 | | Waiting for query cache lock | 0.000033 | | freeing items | 0.000785 | | Waiting for query cache lock | 0.000016 | | freeing items | 0.000002 | | storing result in query cache | 0.000005 | | logging slow query | 0.000003 | | cleaning up | 0.000004 | +--------------------------------+----------+ 24 rows in set (0.00 sec) mysql> select count(*) from sakila.payment; +----------+ | count(*) | +----------+ | 16049 | +----------+ 1 row in set (0.00 sec) mysql> show profiles; +----------+------------+-------------------------------------+ | Query_ID | Duration | Query | +----------+------------+-------------------------------------+ | 1 | 0.00020400 | select @@profiling | | 2 | 0.00008900 | select count(*) from payment | | 3 | 0.00006800 | show databaes | | 4 | 0.02102800 | show databases | | 5 | 0.02847600 | select count(*) from sakila.payment | | 6 | 0.00006900 | select count(*) from sakila.payment | +----------+------------+-------------------------------------+ 6 rows in set (0.00 sec) mysql> show profile for query 6; +--------------------------------+----------+ | Status | Duration | +--------------------------------+----------+ | starting | 0.000029 | | Waiting for query cache lock | 0.000004 | | checking query cache for query | 0.000007 | | checking privileges on cached | 0.000004 | | checking permissions | 0.000008 | | sending cached result to clien | 0.000012 | | logging slow query | 0.000002 | | cleaning up | 0.000003 | +--------------------------------+----------+ 8 rows in set (0.00 sec)
sending data比较耗费cpu
mysql> select min(seq) seq,state,count(*) numb_ops,
-> round(sum(duration),5) sum_dur, round(avg(duration),5) avg_dur,
-> round(sum(cpu_user),5) sum_cpu, round(avg(cpu_user),5) avg_cpu
-> from information_schema.profiling
-> where query_id = 5
-> group by state
-> order by seq;
+------+--------------------------------+----------+---------+---------+---------+---------+
| seq | state | numb_ops | sum_dur | avg_dur | sum_cpu | avg_cpu |
+------+--------------------------------+----------+---------+---------+---------+---------+
| 2 | starting | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 3 | Waiting for query cache lock | 4 | 0.00006 | 0.00002 | 0.00100 | 0.00025 |
| 4 | checking query cache for query | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 |
| 5 | checking permissions | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 6 | Opening tables | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 7 | System lock | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 9 | init | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
| 10 | optimizing | 1 | 0.02326 | 0.02326 | 0.00000 | 0.00000 |
| 11 | statistics | 1 | 0.00012 | 0.00012 | 0.00000 | 0.00000 |
| 12 | preparing | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 |
| 13 | executing | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 |
| 14 | Sending data | 1 | 0.00383 | 0.00383 | 0.00300 | 0.00300 |
| 15 | end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 16 | query end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 17 | closing tables | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 |
| 18 | freeing items | 3 | 0.00086 | 0.00029 | 0.00000 | 0.00000 |
| 23 | storing result in query cache | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 |
| 24 | logging slow query | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
| 25 | cleaning up | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 |
+------+--------------------------------+----------+---------+---------+---------+---------+
19 rows in set (0.00 sec)
mysql> show profile cpu for query 5;
+--------------------------------+----------+----------+------------+
| Status | Duration | CPU_user | CPU_system |
+--------------------------------+----------+----------+------------+
| starting | 0.000030 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000005 | 0.000000 | 0.000000 |
| checking query cache for query | 0.000043 | 0.000000 | 0.000000 |
| checking permissions | 0.000007 | 0.000000 | 0.000000 |
| Opening tables | 0.000027 | 0.000000 | 0.000000 |
| System lock | 0.000010 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000010 | 0.001000 | 0.000000 |
| init | 0.000000 | 0.000000 | 0.000000 |
| optimizing | 0.023255 | 0.000000 | 0.000000 |
| statistics | 0.000118 | 0.000000 | 0.000000 |
| preparing | 0.000041 | 0.000000 | 0.000000 |
| executing | 0.000033 | 0.000000 | 0.000000 |
| Sending data | 0.003833 | 0.002999 | 0.001000 |
| end | 0.000054 | 0.000000 | 0.000000 |
| query end | 0.000045 | 0.000000 | 0.000000 |
| closing tables | 0.000045 | 0.000000 | 0.000000 |
| freeing items | 0.000072 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000033 | 0.000000 | 0.000000 |
| freeing items | 0.000785 | 0.000000 | 0.000000 |
| Waiting for query cache lock | 0.000016 | 0.000000 | 0.000000 |
| freeing items | 0.000002 | 0.000000 | 0.000000 |
| storing result in query cache | 0.000005 | 0.000000 | 0.000000 |
| logging slow query | 0.000003 | 0.000000 | 0.000000 |
| cleaning up | 0.000004 | 0.000000 | 0.000000 |
+--------------------------------+----------+----------+------------+
24 rows in set (0.00 sec)
mysql> show profile block io for query 5;
+--------------------------------+----------+--------------+---------------+
| Status | Duration | Block_ops_in | Block_ops_out |
+--------------------------------+----------+--------------+---------------+
| starting | 0.000030 | 0 | 0 |
| Waiting for query cache lock | 0.000005 | 0 | 0 |
| checking query cache for query | 0.000043 | 0 | 0 |
| checking permissions | 0.000007 | 0 | 0 |
| Opening tables | 0.000027 | 0 | 0 |
| System lock | 0.000010 | 0 | 0 |
| Waiting for query cache lock | 0.000010 | 0 | 0 |
| init | 0.000000 | 0 | 0 |
| optimizing | 0.023255 | 0 | 0 |
| statistics | 0.000118 | 0 | 0 |
| preparing | 0.000041 | 0 | 0 |
| executing | 0.000033 | 0 | 0 |
| Sending data | 0.003833 | 0 | 0 |
| end | 0.000054 | 0 | 0 |
| query end | 0.000045 | 0 | 0 |
| closing tables | 0.000045 | 0 | 0 |
| freeing items | 0.000072 | 0 | 0 |
| Waiting for query cache lock | 0.000033 | 0 | 0 |
| freeing items | 0.000785 | 0 | 0 |
| Waiting for query cache lock | 0.000016 | 0 | 0 |
| freeing items | 0.000002 | 0 | 0 |
| storing result in query cache | 0.000005 | 0 | 0 |
| logging slow query | 0.000003 | 0 | 0 |
| cleaning up | 0.000004 | 0 | 0 |
+--------------------------------+----------+--------------+---------------+
24 rows in set (0.00 sec)
mysql> select min(seq) seq,state,count(*) numb_ops, -> round(sum(duration),5) sum_dur, round(avg(duration),5) avg_dur, -> round(sum(cpu_user),5) sum_cpu, round(avg(cpu_user),5) avg_cpu -> from information_schema.profiling -> where query_id = 5 -> group by state -> order by seq; +------+--------------------------------+----------+---------+---------+---------+---------+ | seq | state | numb_ops | sum_dur | avg_dur | sum_cpu | avg_cpu | +------+--------------------------------+----------+---------+---------+---------+---------+ | 2 | starting | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 | | 3 | Waiting for query cache lock | 4 | 0.00006 | 0.00002 | 0.00100 | 0.00025 | | 4 | checking query cache for query | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 | | 5 | checking permissions | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 | | 6 | Opening tables | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 | | 7 | System lock | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 | | 9 | init | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 | | 10 | optimizing | 1 | 0.02326 | 0.02326 | 0.00000 | 0.00000 | | 11 | statistics | 1 | 0.00012 | 0.00012 | 0.00000 | 0.00000 | | 12 | preparing | 1 | 0.00004 | 0.00004 | 0.00000 | 0.00000 | | 13 | executing | 1 | 0.00003 | 0.00003 | 0.00000 | 0.00000 | | 14 | Sending data | 1 | 0.00383 | 0.00383 | 0.00300 | 0.00300 | | 15 | end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 | | 16 | query end | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 | | 17 | closing tables | 1 | 0.00005 | 0.00005 | 0.00000 | 0.00000 | | 18 | freeing items | 3 | 0.00086 | 0.00029 | 0.00000 | 0.00000 | | 23 | storing result in query cache | 1 | 0.00001 | 0.00001 | 0.00000 | 0.00000 | | 24 | logging slow query | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 | | 25 | cleaning up | 1 | 0.00000 | 0.00000 | 0.00000 | 0.00000 | +------+--------------------------------+----------+---------+---------+---------+---------+ 19 rows in set (0.00 sec) mysql> show profile cpu for query 5; +--------------------------------+----------+----------+------------+ | Status | Duration | CPU_user | CPU_system | +--------------------------------+----------+----------+------------+ | starting | 0.000030 | 0.000000 | 0.000000 | | Waiting for query cache lock | 0.000005 | 0.000000 | 0.000000 | | checking query cache for query | 0.000043 | 0.000000 | 0.000000 | | checking permissions | 0.000007 | 0.000000 | 0.000000 | | Opening tables | 0.000027 | 0.000000 | 0.000000 | | System lock | 0.000010 | 0.000000 | 0.000000 | | Waiting for query cache lock | 0.000010 | 0.001000 | 0.000000 | | init | 0.000000 | 0.000000 | 0.000000 | | optimizing | 0.023255 | 0.000000 | 0.000000 | | statistics | 0.000118 | 0.000000 | 0.000000 | | preparing | 0.000041 | 0.000000 | 0.000000 | | executing | 0.000033 | 0.000000 | 0.000000 | | Sending data | 0.003833 | 0.002999 | 0.001000 | | end | 0.000054 | 0.000000 | 0.000000 | | query end | 0.000045 | 0.000000 | 0.000000 | | closing tables | 0.000045 | 0.000000 | 0.000000 | | freeing items | 0.000072 | 0.000000 | 0.000000 | | Waiting for query cache lock | 0.000033 | 0.000000 | 0.000000 | | freeing items | 0.000785 | 0.000000 | 0.000000 | | Waiting for query cache lock | 0.000016 | 0.000000 | 0.000000 | | freeing items | 0.000002 | 0.000000 | 0.000000 | | storing result in query cache | 0.000005 | 0.000000 | 0.000000 | | logging slow query | 0.000003 | 0.000000 | 0.000000 | | cleaning up | 0.000004 | 0.000000 | 0.000000 | +--------------------------------+----------+----------+------------+ 24 rows in set (0.00 sec) mysql> show profile block io for query 5; +--------------------------------+----------+--------------+---------------+ | Status | Duration | Block_ops_in | Block_ops_out | +--------------------------------+----------+--------------+---------------+ | starting | 0.000030 | 0 | 0 | | Waiting for query cache lock | 0.000005 | 0 | 0 | | checking query cache for query | 0.000043 | 0 | 0 | | checking permissions | 0.000007 | 0 | 0 | | Opening tables | 0.000027 | 0 | 0 | | System lock | 0.000010 | 0 | 0 | | Waiting for query cache lock | 0.000010 | 0 | 0 | | init | 0.000000 | 0 | 0 | | optimizing | 0.023255 | 0 | 0 | | statistics | 0.000118 | 0 | 0 | | preparing | 0.000041 | 0 | 0 | | executing | 0.000033 | 0 | 0 | | Sending data | 0.003833 | 0 | 0 | | end | 0.000054 | 0 | 0 | | query end | 0.000045 | 0 | 0 | | closing tables | 0.000045 | 0 | 0 | | freeing items | 0.000072 | 0 | 0 | | Waiting for query cache lock | 0.000033 | 0 | 0 | | freeing items | 0.000785 | 0 | 0 | | Waiting for query cache lock | 0.000016 | 0 | 0 | | freeing items | 0.000002 | 0 | 0 | | storing result in query cache | 0.000005 | 0 | 0 | | logging slow query | 0.000003 | 0 | 0 | | cleaning up | 0.000004 | 0 | 0 | +--------------------------------+----------+--------------+---------------+ 24 rows in set (0.00 sec)
再看同结构数据的MyISAM表
mysql> create table payment_myisam like payment;
Query OK, 0 rows affected (0.03 sec)
mysql> alter table payment_myisam engine=myisam;
Query OK, 0 rows affected (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table payment_myisam\G
*************************** 1. row ***************************
Table: payment_myisam
Create Table: CREATE TABLE `payment_myisam` (
`payment_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`customer_id` smallint(5) unsigned NOT NULL,
`staff_id` tinyint(3) unsigned NOT NULL,
`rental_id` int(11) DEFAULT NULL,
`amount` decimal(5,2) NOT NULL,
`payment_date` datetime NOT NULL,
`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`payment_id`),
KEY `idx_fk_staff_id` (`staff_id`),
KEY `idx_fk_customer_id` (`customer_id`),
KEY `fk_payment_rental` (`rental_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
mysql> insert into payment_myisam select * from payment;
Query OK, 16049 rows affected (0.10 sec)
Records: 16049 Duplicates: 0 Warnings: 0
mysql> create table payment_myisam like payment; Query OK, 0 rows affected (0.03 sec) mysql> alter table payment_myisam engine=myisam; Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> show create table payment_myisam\G *************************** 1. row *************************** Table: payment_myisam Create Table: CREATE TABLE `payment_myisam` ( `payment_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT, `customer_id` smallint(5) unsigned NOT NULL, `staff_id` tinyint(3) unsigned NOT NULL, `rental_id` int(11) DEFAULT NULL, `amount` decimal(5,2) NOT NULL, `payment_date` datetime NOT NULL, `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`payment_id`), KEY `idx_fk_staff_id` (`staff_id`), KEY `idx_fk_customer_id` (`customer_id`), KEY `fk_payment_rental` (`rental_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 1 row in set (0.00 sec) mysql> insert into payment_myisam select * from payment; Query OK, 16049 rows affected (0.10 sec) Records: 16049 Duplicates: 0 Warnings: 0
mysql> select count(*) from payment_myisam;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.01 sec)
mysql> show profiles;
| 23 | 0.09449600 | insert into payment_myisam select * from payment |
| 24 | 0.00023500 | select count(*) from payment_myisam |
15 rows in set (0.00 sec)
mysql> select count(*) from payment_myisam; +----------+ | count(*) | +----------+ | 16049 | +----------+ 1 row in set (0.01 sec) mysql> show profiles; | 23 | 0.09449600 | insert into payment_myisam select * from payment | | 24 | 0.00023500 | select count(*) from payment_myisam | 15 rows in set (0.00 sec)
mysql> show profile for query 24;
+--------------------------------+----------+
| Status | Duration |
+--------------------------------+----------+
| starting | 0.000026 |
| Waiting for query cache lock | 0.000003 |
| checking query cache for query | 0.000037 |
| checking permissions | 0.000006 |
| Opening tables | 0.000015 |
| System lock | 0.000009 |
| Waiting for query cache lock | 0.000019 |
| init | 0.000011 |
| optimizing | 0.000006 |
| executing | 0.000006 |
| end | 0.000000 |
| query end | 0.000001 |
| closing tables | 0.000008 |
| freeing items | 0.000019 |
| Waiting for query cache lock | 0.000008 |
| freeing items | 0.000013 |
| Waiting for query cache lock | 0.000008 |
| freeing items | 0.000008 |
| storing result in query cache | 0.000015 |
| logging slow query | 0.000008 |
| cleaning up | 0.000009 |
+--------------------------------+----------+
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