Hello
I have just applied the PTI patch on the OS and it is causing a massive difference in the execution time of a specific query.
Disabling and reenabling PTI enables me to reproduce the difference at will :
PTI disabled : 7s
PTI enabled : 87s
The query :
SELECT * FROM `test` as b1 WHERE b1.`dateFin` > '2018-01-24' AND NOT EXISTS (SELECT 1 FROM `test` as b2 WHERE b2.`ip` = b1.`ip` AND b2.`dateFin` > b1.`dateFin`);
|
Explain doesn't help much :
+------+--------------------+-------+------+---------------+------+---------+------+------+-------------+
|
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|
+------+--------------------+-------+------+---------------+------+---------+------+------+-------------+
|
| 1 | PRIMARY | b1 | ALL | NULL | NULL | NULL | NULL | 4499 | Using where |
|
| 2 | DEPENDENT SUBQUERY | b2 | ALL | NULL | NULL | NULL | NULL | 4499 | Using where |
|
+------+--------------------+-------+------+---------------+------+---------+------+------+-------------+
|
Can't see any report matching that kind of difference so far so i'm wondering what's up
- relates to
-
MDEV-15163
Massive performance impact after PTI fix 2
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-
Closed
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