How to decrease this mysql query execution time? - mysql

Question

Parent Table,
mysql> desc sattool_testing;
+------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------+--------------+------+-----+---------+----------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| circuit_id | varchar(30) | NO | | NULL | |
| coff_id | varchar(100) | NO | | NULL | |
| result | int(11) | YES | | NULL | |
| result_details | text | NO | | NULL | |
| details | longtext | NO | | NULL | |
| reverse_response | varchar(100) | NO | | NULL | |
| start_date | datetime | NO | | NULL | |
| end_date | datetime | YES | | NULL | |
| Modules | varchar(100) | YES | | NULL | |
| rehit | datetime | YES | | NULL | |
| isAuto | tinyint(1) | NO | | 0 | |
+------------------+--------------+------+-----+---------+----------------+
12 rows in set (0.00 sec)
1st Child Table,
mysql> desc sattool_desc;
+--------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+--------------+------+-----+---------+----------------+
| sattool_desc_id | bigint(20) | NO | PRI | NULL | auto_increment |
| ceinterface | varchar(50) | YES | | NULL | |
| cehostname | varchar(50) | YES | | NULL | |
| vprnno | varchar(50) | YES | | NULL | |
| policyname | varchar(50) | YES | | NULL | |
| cosno | varchar(10) | YES | | NULL | |
| peipaddress | varchar(17) | YES | | NULL | |
| router_type | varchar(5) | YES | | NULL | |
| sattool_testing_id | bigint(20) | YES | | NULL | |
| epipeid | varchar(20) | YES | | NULL | |
| cerouter | varchar(10) | YES | | NULL | |
| service_type | varchar(10) | YES | | NULL | |
| scope_of_manage | varchar(50) | YES | | NULL | |
| service_name | varchar(10) | YES | | NULL | |
| ce_vrf_name | varchar(150) | YES | | NULL | |
+--------------------+--------------+------+-----+---------+----------------+
15 rows in set (0.01 sec)
2nd Child Table (Contain multiple records against one parent table record),
mysql> desc sattool_error_log;
+----------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+--------------+------+-----+-------------------+-----------------------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| service_id | varchar(30) | NO | | NULL | |
| coff_id | varchar(50) | NO | | NULL | |
| error_name | varchar(100) | NO | | NULL | |
| error_desc | text | NO | | NULL | |
| error_occurred | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| error_type | int(11) | YES | | NULL | |
| error_code | varchar(10) | YES | | NULL | |
| sattool_id | bigint(20) | YES | | 0 | |
| module_no | int(11) | YES | | 0 | |
+----------------+--------------+------+-----+-------------------+-----------------------------+
10 rows in set (0.00 sec)
SQL Query :-
SELECT GROUP_CONCAT(sattool_error_log.error_desc) AS err_desc, GROUP_CONCAT(sattool_error_log.error_type) AS err_type, sattool_testing.*, sattool_desc.service_type, sattool_desc.service_name, sattool_desc.scope_of_manage
FROM sattool_testing
LEFT JOIN sattool_desc ON sattool_testing.id = sattool_desc.sattool_testing_id
LEFT JOIN sattool_error_log ON sattool_testing.id = sattool_error_log.sattool_id
WHERE sattool_testing.isAuto = 1 GROUP BY sattool_testing.id ORDER BY sattool_testing.id DESC limit 100
Current Execution Time is (22.76 sec)
Explain Query :-
+----+-------------+-------------------+------+---------------+------+---------+------+------+----------------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------------------+------+---------------+------+---------+------+------+----------------------------------------------+
| 1 | SIMPLE | sattool_testing | ALL | NULL | NULL | NULL | NULL | 3578 | Using where; Using temporary; Using filesort |
| 1 | SIMPLE | sattool_desc | ALL | NULL | NULL | NULL | NULL | 4009 | |
| 1 | SIMPLE | sattool_error_log | ALL | NULL | NULL | NULL | NULL | 8904 | |
+----+-------------+-------------------+------+---------------+------+---------+------+------+----------------------------------------------+
3 rows in set (0.00 sec)
I want to increase speed to above query execution.
Please give me suggestion on that.

Answer 1

Thanks!!!
I have added index to the columns used in the join/where clauses.
Like :-
ALTER TABLE sattool_desc ADD INDEX sattool_testing_id (sattool_testing_id);
ALTER TABLE sattool_error_log ADD INDEX sattool_id (sattool_id);
ALTER TABLE sattool_testing ADD INDEX isAuto (isAuto);
Now the execution time is 100 rows in set (0.00 sec).
Thanks again.