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When is the start_time recorded in the mysql.slow_log table?

Answer: the end time of the statement

Mysql > select now (); select count (distinct url) from test order by url asc, example desc

+-+

| | now () |

+-+

| | 2016-01-18 16:25:19 |

+-+

1 row in set (0.00 sec)

+-+

| | count (distinct url) |

+-+

| | 199 |

+-+

1 row in set (16.15 sec)

Mysql > select * from mysql.slow_log order by start_time desc limit 10\ G

* * 1. Row *

Start_time: 2016-01-18 16:25:35

User_host: root [root] @ localhost []

Query_time: 00:00:16

Lock_time: 00:00:00

Rows_sent: 1

Rows_examined: 824832

Db: test

Last_insert_id: 0

Insert_id: 0

Server_id: 168039296

Sql_text: select count (distinct url) from test order by url asc, example desc

Thread_id: 4

1 row in set (0.00 sec)

Start_time is 16:25:35 minus query_time: 00:00:16 equals 16:25:19

So start_time records the end time of the statement.

What is recorded in the slow_log file is

# Time: 160118 16:25:35

# User@Host: root [root] @ localhost [] Id: 4

# Query_time: 16.152763 Lock_time: 0.000102 Rows_sent: 1 Rows_examined: 824832

SET timestamp=1453105535

Select count (distinct url) from test order by url asc, example desc

The time and timestamp values are the same, and both are the end time of the statement

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