On Oct 22, 2009, at 3:30 PM, Phpster wrote:
Have you run an explain plan on the query?
Bastien
Sent from my iPod
Yes, I have. For giggles, I wanted to run it again. Here it is
(slightly stripped down) and it looks good to me.
mysql> EXPLAIN SELECT
-> `p`.`patient_id`,
-> `p`.`address_id`,
-> `p`.`patient_sub_id`,
-> AES_DECRYPT(`p`.`patient_first_name`, 'hidden_key') AS
`patient_first_name`,
-> AES_DECRYPT(`p`.`patient_last_name`, 'hidden_key') AS
`patient_last_name`,
-> AES_DECRYPT(`p`.`patient_middle_name`, 'hidden_key') AS
`patient_middle_name`,
-> AES_DECRYPT(`p`.`patient_dob`, 'hidden_key') AS `patient_dob`
-> FROM `patient` `p`
-> INNER JOIN `center_patient` `cp` ON `p`.`patient_id` =
`cp`.`patient_id`
-> WHERE ((`p`.`patient_id` = '256783' OR `p`.`patient_sub_id` =
'256783') AND `cp`.`center_id` = '109')
-> ORDER BY `patient_id` DESC;
+----+---------+--------------------+------
+------------------------------------------------------------------+
| id | key_len | ref | rows |
Extra |
+----+---------+--------------------+------
+------------------------------------------------------------------+
| 1 | 4,4 | NULL | 2 | Using union
(PRIMARY,patient_sub_id); Using where; Using filesort |
| 1 | 8 | p.patient_id,const | 1 | Using
index |
+----+---------+--------------------+------
+------------------------------------------------------------------+
2 rows in set (0.00 sec)
There are about 350,000 records in `patient` and `center_patient`
tables. The average number of rows returned from this query is less
than 5.
~Philip
On Oct 22, 2009, at 4:14 PM, Philip Thompson
<philthathril@xxxxxxxxx> wrote:
Hi all.
I'm running into a random issue where sometimes it take several
minutes (up to 10 or 15) to complete a query. According to 1 or 2
references, this may be a mysql bug. These links explain the
similar problem I'm experiencing:
http://forums.mysql.com/read.php?24,57257
http://forum.percona.com/s/m/790/
I did some testing yesterday and this 1 sql statement successfully
queried (in milliseconds) approximately 50,000 times before it took
several minutes to query, which hung all the other processes on the
database. Because it occurs successfully so many times, I know the
query is good.
Is it possible to set a time limit on a single function in PHP?
E.g., when I call mysql_query() and it takes 30 seconds, then quit
processing that function and continue on. I know I could
set_time_limit() to a specific time, but that would cause a fatal
error... and I want to be able to catch it.
Any thoughts on what direction I should go? Also, I'm going to do
some research to see if a newer version of mysql has fixed this
bug. We're running 5.0.45.
Thanks,
~Philip
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