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Server Slow When Exec Following Query


i try to tweak mysql server but the process still very slow to exec o following query

exec time 2min for 11k row in two table

update uploaded,uploaded_job set uploaded.export = 'yes' WHERE uploaded.work_order =uploaded_job.work_order and uploaded_job.claim_status IS NULL

i had try indexing and optimise my database result still the same.




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I am trying to figure out why I have a hugely slow query (~2 seconds in my testing environment). Details are below:

It involves two tables, products and vendors.

Products is a huge table, so I will only include the (ostensibly!) relevant fields in its description:

CREATE TABLE `products` (
`id` int(11) NOT NULL auto_increment,
`vendor_id` smallint(6) NOT NULL default Ɔ',
`product_code` varchar(255) NOT NULL default '',
`internal_name` varchar(255) NOT NULL default '',
`lastmodified` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,

PRIMARY KEY (`id`),
UNIQUE KEY `product_code` (`product_code`),
KEY `vendor_id` (`vendor_id`)
) ENGINE=MyISAM;
Vendors are much more straightforward:



CREATE TABLE `vendors` (
`id` smallint(6) NOT NULL auto_increment,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM;
The following query executes in no MORE than 0.01 seconds:


SELECT DISTINCT p.id
, p.product_code
, unix_timestamp(p.lastmodified) as lastmodified
, p.internal_name
FROM products as p
ORDER BY p.product_code ASC
LIMIT 0, 30;
And has the following attributes:

+----+-------------+-------+-------+---------------+--------------+---------+------+-------+-----------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------+--------------+---------+------+-------+-----------------+
| 1 | SIMPLE | p | index | NULL | product_code | 257 | NULL | 25124 | Using temporary |
+----+-------------+-------+-------+---------------+--------------+---------+------+-------+-----------------+
When I join with the vendors table, so that I can fetch the vendor's name for each product, I use the following query, which takes about 1.88 seconds:



SELECT DISTINCT p.id
, p.product_code
, unix_timestamp(p.lastmodified) as lastmodified
, p.internal_name
, v.name as vendor_name
FROM products as p
LEFT JOIN vendors as v ON v.id=p.vendor_id
ORDER BY p.product_code ASC
LIMIT 0, 30;
It has the following characteristics:

+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+---------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+---------------------------------+
| 1 | SIMPLE | p | ALL | NULL | NULL | NULL | NULL | 25124 | Using temporary; Using filesort |
| 1 | SIMPLE | v | eq_ref | PRIMARY | PRIMARY | 2 | te_inventory.p.vendor_id | 1 | |
+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+---------------------------------+
Note the addition of the filesort. I'm unhappy enough about the temporary, which I don't really understand, but the filesort is, I'm fairly sure, killing me.

Closer investigation (or maybe just common sense if you aren't a MySQL newbie like me) shows that the ORDER BY clause is responsible, for when I join without the ORDER BY, my query time goes back down to 0.01 seconds or so:



mysql> explain SELECT DISTINCT p.id
-> , p.product_code
-> , unix_timestamp(p.lastmodified) as lastmodified
-> , p.internal_name
-> , v.name as vendor_name
-> FROM products as p
-> LEFT JOIN vendors as v ON v.id=p.vendor_id
-> LIMIT 0,30;
+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+-----------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+-----------------+
| 1 | SIMPLE | p | ALL | NULL | NULL | NULL | NULL | 25124 | Using temporary |
| 1 | SIMPLE | v | eq_ref | PRIMARY | PRIMARY | 2 | te_inventory.p.vendor_id | 1 | |
+----+-------------+-------+--------+---------------+---------+---------+--------------------------+-------+-----------------+
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PHP

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# Time: 070528 17:14:57
# User@Host: counter[counter] @ localhost []
# Query_time: 3 Lock_time: 0 Rows_sent: 7 Rows_examined: 120647
SELECT SQL_CACHE `webpageUrl`, `webpageName`, COUNT(*) AS `count`, (COUNT(*) / (SELECT COUNT(*) FROM _1_log)) AS `pct` FROM _1_log GROUP BY `webpageUrl` ORDER BY `count` DESC LIMIT 7;

mysql> select count(*) from _1_log;
+----------+
| count(*) |
+----------+
| 111824 |
+----------+
1 row in set (0.00 sec)

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Slow Execution For A Left Outer Join Query
Whats likely to be the cause of slow execution for a left outer join query?

The original query joins three tables but even if I narrow it down to one it still takes a long time to execute.

$query = "select distinct materials.* from materials";
$query .= " left outer join materials_products on materials.material_id = materials_products.material_id";

There's 914 rows in the materials table and 1348 row in the materials_products table

Is it likely to take a long time for this amount of data or is there likely to be a problem in the table(s) set up or query?

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Lost Connection To MySQL Server During Query (LAMP Server)
I recently installed an ubuntu LAMP server for my website and upon trying a script that uses a mysql database (which I set up the tables via phpmyadmin) and I get this error:

Warning: mysql_connect(): Lost connection to MySQL server during query in /home/tanner/Desktop/bot/DoctorWho/db_connect.php on line 4

I've searched the forums and I've gotten no answers. Anyone know the answer?

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Lost Connection To MySQL Server During Query / Server Has Gone Away
All of a sudden the server stopped working. When trying to execute a simple INSERT both from PHP and Query Browser, the server crashes and I get either "Lost connection to MySQL server during query" or "Server has gone away" errors.

The problem started on 5.0.18, and upgrading to 5.0.41 didn't help. I'm using Windows XP SP2.

I've seen quite a few posts on similar problems, but no real solutions though. Is that a bug?

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Lots And Lots Of Threads :: Slow Server
currently, mySQL threads are using all my CPU - causing site slow down. We have 2x 3.2Ghz processors and only around 10k visitors a day.

It seems that the server is creating lots of mysql threads, whereas on another server that I monitor (running completly different setup) no matter how many visitors there is only 1 mysql thread running, sometimes that goes up to 90% CPU usage, but theres only 1 thread, whereas on the new server, the threads seem to take up all the CPU no matter how many visitors we have, we currently have around 6 mysql threads that are using 60% cpu and a few using around 9% (not sure how thats even possible). If there were more threads they would use a lot less, but if there are less then they use a lot more.

Basically, I want to know a) why is one server creating lots of mysql threads and why is the other only creating 1 and b) how can I reduce the CPU load.

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Query For Server Name
I am running a mysql cluster with several API nodes. I just setup load balancing and getting ready to do some tests. I want to run a query for something like servername on a loop and see if my load balancer is sending every other query to different API nodes. Is there a select statement I can use to find out the server name?

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Convert Sql Server Query
I am trying to convert an old sql server query into a mysql query.This is the current query:
select filename, folder2, folder1 from history as T1 where T1.time_str like '01/Jan/07*' and T1.billed = 'no' and T1.username like 'zummy12' and T1.time_str = (Select Top 1 T2.time_str From history T2 Where T1.folder2 = T2.folder2 and T1.username = T2.username And Left(T1.time_str,12) like Left(T2.time_str,12) Order By T2.[date_time] Desc)

which produces the following error:

(1064, "You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'Select Top 1 T2.time_str From history T2 Where T1.folder2 = T2.")


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Mysql Query Between Two Server
I have two Mysql server and I have to execute a query like this:

insert into thisserver.table1
select * from anotherserver.table1 where anotherserver.table1.columnid not in
(select * from thisserver.table1)

Is it possible (like in MS Sql)?

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Query Does Not Work On Some Server Instances
query:

Select * From Students Where C_Name = "XXXXXX"

WHen I run this query on 2 of my computers, the result returns no rows.

When I run this query on a remote machine hosted by 1and1, with a copy of the same database, the query returns the correct row.

The syntax is identical.....

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Switch Query Logging While The Server Is Running
It would be nice if general query logging could be switched on and off while the MySQL server is running, and not only at startup time. While debugging an application that uses foreign database access libraries, this would be very helpful. One could switch on logging, perform an activity, switch off logging, and look what has happened.

Otherwise, the server has to be restarted to change logging, which is a bit annoying...

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GO Keyword Like SQL Server Query Editor--for MYCC?
Is there an equivalent for MyCC, of the go keyword used in SQL servers Query Analyzer to execute multiple statements.

LIke I want to

Use DB1
go

SELECT * from WHATEVER
go

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Lost Connection To MySQL Server During Query (install)
Bog standard SuSE 8.2 Linux install.

I have installed mySQL (off the SuSE 8.2 distro CDs). I can connect locally,
e.g:

bealzebub> mysql -u root -p mysql -h localhost

....logs me in just fine. However, this:

bealzebub> mysql -u root -p mysql -h bealzebub

....causes the connection to fail with: "ERROR 2013: Lost connection to MySQL server during query". Its the same if I try to log in from another machine.

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Lost Connection To Mysql Server During Query (Windows XP)
I have following problem: when I try to connect from Windows XP to mysql server (linux computer), I get the following error: Lost connection to mysql server during query. This happens when I test the connection.

I have firewall in linux, so I opened the port 3306. Is there something else I need to change to make sure that the connection will work properly?

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Lost Connection To Mysql Server During Query (VB Front End)
I'm running mysql stored procedure using VB as front end. While clicking Ok button in application it calls 3 stored procedures and returns a resultset. First time it works properly. If second time clicked the error 'lost connection to mysql server during query' displayed. Third time works fine. Like this alternatively throws error message.

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2013 Lost Connection To Mysql Server During Query
I am using mysql 4.1. When a large query is made; the page loads for a while, then it goes to a blank page,making me think it is a memory problem, so I modified php.ini which can be seen below.

php.ini(excerpt)

memory_limit = 70M
post_max_size = 15M
file_uploads = On
upload_max_filesize = 14M
expose_php = Off
max_input_time = 60

when turning on error messages I get the error

Mysql::query: 2013 - Lost connection to MySQL server during query SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 2 AND m.client_id = 1 ORDER BY position, ordering

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Error Code 102 :: Lost Connection To MySQL Server During Query
After changing RAM and the ethernet card of my DB server, the problem of getting frequent:

Database error (error code 102)
Could not connect to database server (Lost connection to MySQL server during query)

Still occurs ;/

I've tried to eliminate all factors (like multiple servers, load-balancers, replication etc) so I have wrote a php script that only does the following:

- opens db connection
- does a simple select
- closes db connection

If I refresh this page over and over, every 6-7 times I get the above error. Anyone have any further solutions, ?? I've tried the software (re-installing mysql, upgrading, etc....) and tried the hardware (RAM, ethernet card). Nothing seems to help.

The DB server is Linux Redhat 7.3 with the 2.4.18-3smp kernel. I am running MySQL standard 4.0.13.

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ERROR 2013: Lost Connection To MySQL Server During Query ..
I get this error when i try to remotely connect to my mysql server, it has been working until i changed the server's ip and isp, when i re-change the mysql server to the old ip address (first isp), it's working again.

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ERROR 2013: Lost Connection To MySQL Server During Query?
I have recently installed suse 9.0 linux which has MySQL 4.0.15 as part of the distribution. After I set up my users I was able to use mysqldump and pipe it into mysql on my windows machine running 4.0.16 to dump a database to the linux box. However, now when I try to login to the linux box from another machine on the network I get a query timed out error immediately after I enter the command line to start the mysql client.

mysql -h 192.168.1.2 -u cdw -pxxxxxx
ERROR 2013: Lost connection to MySQL server during query

The error happens with in a small fraction of a second after I type in the command. I can login from the linux machine just fine though.

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