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How to filter out the slow query log from the MYSQL query log and find out the TOP SQL, I believe that many inexperienced people do not know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

There is only time but no date information in # Time in the MYSQL slow query log. You need to know the specific date of a slow query SQL.

You need the unix_timestamp function to convert the timestamp information in # Time into date information.

Unix_timestamp (datetime= > timestamp)

From_unixtime (timestamp= > datetime)

Mysql > select unix_timestamp ('2021-10-26 17V 30v 00')

+-+

| | unix_timestamp ('2021-10-26 1715-3015) | |

+-+

| | 1451122200 |

+-+

1 row in set (0.10 sec)

Select from_unixtime ('1451122200')

Mysql > select from_unixtime ('1451122200')

+-+

| | from_unixtime ('1451122200') | |

+-+

| | 2021-10-26 17-30-30-00.000000 |

+-+

Filter out the slow query logs from 16:30 to 17:30

Method 1: use timestamp filtering

Mysql > select unix_timestamp ('2021-10-26 17V 30v 00')

+-+

| | unix_timestamp ('2021-10-26 1715-3015) | |

+-+

| | 1451122200 |

+-+

1 row in set (0.00 sec)

Mysql > select unix_timestamp ('2021-10-26 16-30 00')

+-+

| | unix_timestamp ('2021-10-26 1615-3015) | |

+-+

| | 1451118600 |

+-+

1 row in set (0.00 sec)

Sed-n'/ SET timestamp=14511186../,/SET timestamp=14511222../'p QITV0223-slow.log > test3.log

Method 2:

Mysql > select unix_timestamp ('2015-12-26 16-12-26 30 00')

+-+

| | unix_timestamp ('2021-10-26 1615-3015) | |

+-+

| | 1451118600 |

+-+

Sed-n'/ SET timestamp=14511186../,$'p QITV0223-slow.log > test4.log

Mysql > select unix_timestamp ('2021-10-26 17V 30v 00')

+-+

| | unix_timestamp ('2021-10-26 1715-3015) | |

+-+

| | 1451122200 |

+-+

1 row in set (0.00 sec)

-- use gred to navigate to the SQL executed at 17:30 in test4.log, such as locating at line 1085

Grep-n 'SET timestamp=14511222..' QITV0223-slow.log test4.log

1085:SET timestamp=1451122200

-- use sed to filter out the first to 1085 rows of data

Sed-n'1 1085 test3.log > test5.log

Method 3: if all SQL have # TIME entries, use # TIME to filter

Sed-n'/ # Time: 151226 16 Time 30 QITV0223-slow.log... test10.log.

If there is no match for "# Time: 151226 17 virtual 30..", all logs from 16:30 to the end of the slow query log will be filtered out.

For the filtered slow query log, retrieve TOP SQL:

1. Get the 10 TOP SQL with the longest execution time.

Mysqldumpslow-st-T10 test10.log > slow_t_top_sql.txt

two。 Get the 10 TOP SQL with the longest average query time.

Mysqldumpslow-s at-t10 test10.log > slow_at_top_sql.txt

3. Get the 10 TOP SQL with the longest lock time.

Mysqldumpslow-sl-T10 test10.log > slow_l_top_sql.txt

4. Get the 10 TOP SQL with the longest average lock time.

Mysqldumpslow-s al-t10 test10.log > slow_l_top_sql.txt

5. Gets the 10 TOP SQL with the most returned records.

Mysqldumpslow-s r-t10 test10.log > slow_r_top_sql.txt

6. Gets the 10 TOP SQL with the most returned records on average.

Mysqldumpslow-s ar-t10 test10.log > slow_r_top_sql.txt

7. Get the 10 TOP SQL with the most execution times.

Mysqldumpslow-s c-t10 test10.log > slow_r_top_sql.txt

After reading the above, do you know how to filter out the slow query log from the MYSQL query log and find out the TOP SQL? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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