is there any methods to optimize a slow running query? - mysql

Question

we are getting frequent slow log alerts because of below query.this query using indexes
i was tried to optimize this query but no luck support me to optimize slow query and how to improve the performance.
i want the output in best time.
My query is
select t.row_mod,
t.widget_info_id,
t.widget_name,
t.text1,
m.pretty_name,
w.website_id,
w.fol3_website_id
from fbw_info_text t,
fbw_info_meta m,
fol3_website w
where t.widget_info_id = m.widget_info_id
and t.widget_name = m.widget_name
and (
m.widget_type = 'checkbox'
or t.widget_name in (
'ccapi_approved_transactions_msg',
'ccapi_declined_transactions_msg',
'ccapi_failed_transactions_msg'
)
)
and t.website_id = w.website_id
and (
(t.row_mod >= '2013-10-24 20:57:32'
and t.row_mod <= '2013-10-24 20:59:32')
or
(m.row_mod >= '2013-10-24 20:57:32'
and m.row_mod <= '2013-10-24 20:59:32')
)
order by widget_info_id, widget_name;
Explain Plan:
+----+-------------+-------+-------+-------------------------------------+----------+---------+----------------------------------------+-------+----------------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+-------------------------------------+----------+---------+----------------------------------------+-------+----------------------------------------------+
| 1 | SIMPLE | w | index | idx_1055,idx_1786 | idx_1522 | 4 | NULL | 25953 | Using index; Using temporary; Using filesort |
| 1 | SIMPLE | t | ref | idx_4639,idx_1055,idx_2718,idx_3388 | idx_1055 | 53 | cms.w.website_id | 12 | Using where |
| 1 | SIMPLE | m | ref | idx_2718 | idx_2718 | 105 | cms.t.widget_name,cms.t.widget_info_id | 1 | Using where |
+----+-------------+-------+-------+-------------------------------------+----------+---------+----------------------------------------+-------+----------------------------------------------+
3 rows in set (0.01 sec)
Table structures
mysql> show create table fbw_info_text\G
*************************** 1. row ***************************
Table: fbw_info_text
Create Table: CREATE TABLE `fbw_info_text` (
`row_mod` datetime DEFAULT NULL,
`row_create` datetime DEFAULT NULL,
`widget_info_id` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`widget_name` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`website_id` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`text1` longtext COLLATE latin1_bin,
`text2` longtext COLLATE latin1_bin,
`submitted_user_id` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`use_default` varchar(1) COLLATE latin1_bin DEFAULT NULL,
`active_flag` varchar(1) COLLATE latin1_bin DEFAULT NULL,
`status` varchar(1) COLLATE latin1_bin DEFAULT NULL,
UNIQUE KEY `idx_4639` (`website_id`,`widget_info_id`,`widget_name`,`status`),
KEY `idx_1055` (`website_id`),
KEY `idx_2718` (`widget_info_id`,`widget_name`),
KEY `idx_3388` (`widget_info_id`,`website_id`,`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_bin
1 row in set (0.01 sec)
mysql> show create table fbw_info_meta\G
*************************** 1. row ***************************
Table: fbw_info_meta
Create Table: CREATE TABLE `fbw_info_meta` (
`row_mod` datetime DEFAULT NULL,
`row_create` datetime DEFAULT NULL,
`widget_name` varchar(50) COLLATE latin1_bin NOT NULL,
`pretty_name` varchar(255) COLLATE latin1_bin DEFAULT NULL,
`widget_info_id` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`widget_type` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`needs_approval` varchar(1) COLLATE latin1_bin DEFAULT NULL,
`widget_value` longtext COLLATE latin1_bin,
`widget_order` int(11) DEFAULT NULL,
`widget_attributes` varchar(255) COLLATE latin1_bin DEFAULT NULL,
`capability_name` varchar(30) COLLATE latin1_bin DEFAULT NULL,
`design_type` varchar(50) COLLATE latin1_bin DEFAULT NULL,
`on_approval_hook` longtext COLLATE latin1_bin,
`display_hook` longtext COLLATE latin1_bin,
`status` varchar(1) COLLATE latin1_bin DEFAULT NULL,
`needs_archive` varchar(1) COLLATE latin1_bin DEFAULT NULL,
UNIQUE KEY `idx_2718` (`widget_name`,`widget_info_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_bin
1 row in set (0.00 sec)
mysql> show create table fol3_website\G
*************************** 1. row ***************************
Table: fol3_website
Create Table: CREATE TABLE `fol3_website` (
`row_mod` datetime DEFAULT NULL,
`row_create` datetime DEFAULT NULL,
`fol3_website_id` int(11) NOT NULL,
`website_id` varchar(50) COLLATE latin1_bin NOT NULL,
`activate_default_host` int(11) DEFAULT '0',
`active` int(11) NOT NULL DEFAULT '1',
`advance_notice_days` int(11) DEFAULT '0',
`catrequest` int(11) DEFAULT '0',
`chain` int(11) DEFAULT NULL,
`color_scheme` varchar(30) COLLATE latin1_bin DEFAULT NULL,
`conversion_rate` int(11) DEFAULT '0',
`comment` varchar(255) COLLATE latin1_bin DEFAULT NULL,
`creation_date` datetime DEFAULT NULL,
`defunct_2` varchar(5) COLLATE latin1_bin DEFAULT NULL,
`default_website` varchar(50) COLLATE latin1_bin NOT NULL,
`designtype` varchar(25) COLLATE latin1_bin DEFAULT NULL,
`key_contact_name` varchar(55) COLLATE latin1_bin DEFAULT NULL,
`key_contact_phone` varchar(60) COLLATE latin1_bin DEFAULT NULL,
`language_id` varchar(5) COLLATE latin1_bin DEFAULT NULL,
`defunct_0` varchar(10) COLLATE latin1_bin DEFAULT NULL,
`mercury` int(11) NOT NULL DEFAULT '1',
`mgnt_defaults_last_applied` datetime DEFAULT NULL,
`rank` varchar(10) COLLATE latin1_bin DEFAULT NULL,
`return_url` varchar(255) COLLATE latin1_bin DEFAULT NULL,
`defunct_1` varchar(10) COLLATE latin1_bin DEFAULT NULL,
`store_id` varchar(15) COLLATE latin1_bin NOT NULL,
`defunct_3` varchar(10) COLLATE latin1_bin DEFAULT NULL,
`display_website_url` varchar(25) COLLATE latin1_bin DEFAULT NULL,
`webloyalty` int(11) DEFAULT NULL,
`name` varchar(255) COLLATE latin1_bin DEFAULT NULL,
`transmission_type` int(11) DEFAULT NULL,
`segment` int(11) DEFAULT NULL,
`site_id` varchar(25) COLLATE latin1_bin DEFAULT NULL,
`canonical_status` int(1) DEFAULT '0',
`canonical_domain` varchar(100) COLLATE latin1_bin DEFAULT NULL,
`mobile_site_active` tinyint(1) DEFAULT '1',
UNIQUE KEY `idx_1055` (`website_id`),
UNIQUE KEY `idx_1522` (`fol3_website_id`),
UNIQUE KEY `idx_1786` (`website_id`,`active`),
KEY `idx_1867` (`transmission_type`),
KEY `idx_857` (`store_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_bin
1 row in set (0.00 sec)

Answer 1

You can try SHOW Profiling functionality of MySQL to find out where most of the time has been taken by a query execution and optimize based on result:
set profiling=1;
Run your slow query (eg SELECT * FROM table WHERE name='xxx';
SHOW PROFILES;
http://dev.mysql.com/doc/refman/5.0/en/show-profile.html
Analyze EXPLAIN EXTENED output and optimize query accourdingly and profile the query again to see gain in performance.