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2
votes
1answer
2k views

MySQL's “slow query” log: strange “Query_time”

I need some help understanding what's going on with my "slow query" log in MySQL. I have set set global long_query_time=3 and yet this is what I see in the slow query log: # Time: 120723 9:04:38 ...
1
vote
1answer
165 views

Reviewing all new MySql queries on staging environment

The problem I am trying to solve: It's well known that not all developers know what is EXPLAIN in MySql, and not every knows how to use it. Large part of them consider MySql as a black box, no matter ...
0
votes
1answer
210 views

MySQL query took 98 seconds to run but EXPLAIN looks okay

I have a query that took 98 seconds to execute this morning, but I can't recreate the problem now, and the EXPLAIN output isn't giving me any clues. Am I missing something? Here's the SQL: SELECT ...
2
votes
1answer
2k views

Transaction Lock Timeouts When Updating a Row

I'm trying to determine the cause of an InnoDB transaction lock timeout. This one is very strange in that it appears to be a deadlock error instead - nonetheless, here's the output of my slow log ...
1
vote
1answer
2k views

MySQL flush logs, unknown error

I gave been trying to solve this for few days now, and cant seem to figure this out. I have been trying to set log rotation for mysql slow using linux logrotate feature, and my script seems to get ...
1
vote
1answer
249 views

time executing inserts + slow SSH

_ Hello, my setup is a slow SSH to some linux machine. From there I start a mysql terminal client and execute about 200k inserts (in a while loop inside a stored procedure). This takes about 3 hours ...
4
votes
3answers
4k views

MySQL slow log configuration

Is there a way of making MySQL slow logs to start new log file every day ? At the moment its just a single large file, and have to grep lines for every day. It would be much more convenient to have ...
2
votes
2answers
460 views

MySQL: Slow log; append CPU usage

I have the MySQL slow log feature enabled: http://dev.mysql.com/doc/refman/5.1/en/slow-query-log.html But sometimes the query_times are high simply due to high CPU load. How can I append the current ...
5
votes
2answers
6k views

Write a slow query to test slow query logging?

Is there a simple query that would take > 2 sec so that I can test the slow query logger? I am looking for something like a generic recursive or iterative statement.
2
votes
5answers
675 views

Help optimizing query in the MySQL slow-query log

Our database is set up so that we have a credentials table that hold multiple different types of credentials (logins and the like). There's also a credential_pairs table that associates some of these ...
4
votes
5answers
2k views

MySQL slow query log: huge query time, no lock time, minuscule number of rows scanned

I have a slow query log item with the following: Query_time: 55 Lock_time: 0 Rows_sent: 739 Rows_examined: 739 No one in my group can explain it besides a guess about packet loss. Is there a ...
4
votes
2answers
2k views

MySQL Slow Query Log - SELECT /*!N SQL_NO_CACHE */

Using mysqldumpslow, I can see that the most common entries in a MySQL slow query log are of the following form: SELECT /*!N SQL_NO_CACHE */ from wp_posts (or wp_comments). I can't seem to find ...
13
votes
5answers
15k views

Where can I find the mysql slow log?

Just as the title says, where can I see it ? Are there any config options for it ( like how many ms would determine if a query is slow or not ) ?