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  • MySQL high IO usage quries

    - by jack
    MySQL has a built-in slow query logger. Is there any options or third-party tools which are able to detect the queries causing high IO usage just in the way like what slow query logger does?

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  • MySQL ORDER BY date and team

    - by Michael
    I would like to order by date and then team in a MySQL query. It should be something similar to this: SELECT * FROM games ORDER BY gamedate ASC, team_id AND it should output something like this: 2010-04-12 10:20 Game 1 Team 1 2010-04-12 11:00 Game 3 Team 1 2010-04-12 10:30 Game 2 Team 2 2010-04-14 10:00 Game 4 Team 1 So that Team 1 is under each other on the same date, but separate on a new date

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  • mysql - funny square characters added to the value when inserting it into table

    - by stone
    Hi, I have a php script that inserts values into mySQL table INSERT INTO stories (title) VALUES('$_REQUEST[title]); I checked the values of my request variables before going into the table and it's fine. But when I add title=john to the table for example, I get something like this: title = "[][][][]john" and when I extract the value, it's a newline then john. I have my columns set to utf-8, I tried swedish character set as well. Note: I don't get this error when inserting values from the phpMyAdmin commandline

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  • Not-quite-JSON string deserialization in Python

    - by cpharmston
    I get the following text as a string from an XML-based REST API 'd':4 'ca':5 'sen':1 'diann':2,6,8 'feinstein':3,7,9 that I'm looking to deserialize into a pretty little Python dictionary: { 'd': [4], 'ca': [5], 'sen': [1], 'diann': [2, 6, 8], 'feinstein': [3, 7, 9] } I'm hoping to avoid using regular expressions or heavy string manipulation, as this format isn't documented and may change. The best I've been able to come up with: members = {} for m in elem.text.split(' '): m = m.split(':') members[m[0].replace("'", '')] = map(int, m[1].split(',')) return members Obviously a terrible approach, but it works, and that's better than anything else I've got right now. Any suggestions on better approaches?

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  • How does MySQL's ORDER BY RAND() work?

    - by Eugene
    Hi, I've been doing some research and testing on how to do fast random selection in MySQL. In the process I've faced some unexpected results and now I am not fully sure I know how ORDER BY RAND() really works. I always thought that when you do ORDER BY RAND() on the table, MySQL adds a new column to the table which is filled with random values, then it sorts data by that column and then e.g. you take the above value which got there randomly. I've done lots of googling and testing and finally found that the query Jay offers in his blog is indeed the fastest solution: SELECT * FROM Table T JOIN (SELECT CEIL(MAX(ID)*RAND()) AS ID FROM Table) AS x ON T.ID >= x.ID LIMIT 1; While common ORDER BY RAND() takes 30-40 seconds on my test table, his query does the work in 0.1 seconds. He explains how this functions in the blog so I'll just skip this and finally move to the odd thing. My table is a common table with a PRIMARY KEY id and other non-indexed stuff like username, age, etc. Here's the thing I am struggling to explain SELECT * FROM table ORDER BY RAND() LIMIT 1; /*30-40 seconds*/ SELECT id FROM table ORDER BY RAND() LIMIT 1; /*0.25 seconds*/ SELECT id, username FROM table ORDER BY RAND() LIMIT 1; /*90 seconds*/ I was sort of expecting to see approximately the same time for all three queries since I am always sorting on a single column. But for some reason this didn't happen. Please let me know if you any ideas about this. I have a project where I need to do fast ORDER BY RAND() and personally I would prefer to use SELECT id FROM table ORDER BY RAND() LIMIT 1; SELECT * FROM table WHERE id=ID_FROM_PREVIOUS_QUERY LIMIT 1; which, yes, is slower than Jay's method, however it is smaller and easier to understand. My queries are rather big ones with several JOINs and with WHERE clause and while Jay's method still works, the query grows really big and complex because I need to use all the JOINs and WHERE in the JOINed (called x in his query) sub request. Thanks for your time!

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  • ArgumentOutOfRangeException at MySql execution. (MySqlConnector .NET)

    - by Lazlo
    I am getting this exception from a MySqlCommand.ExecuteNonQuery(): Index and length must refer to a location within the string. Parameter name: length The command text is as follows: INSERT INTO accounts (username, password, salt, pin, banned, staff, logged_in, points_a, points_b, points_c, birthday) VALUES ('adminb', 'aea785fbcac7f870769d30226ad55b1aab850fb0979ee00481a87bc846744a646a649d30bca5474b59e4292095c74fa47ae6b9b3a856beef332ff873474cc0d3', 'cb162ef55ff7c58c7cb9f2a580928679', '', '0, '0', '0', '0', '0', '0', '2010-04-18') Sorry for the long string, it is a SHA512 hash. I tried manually adding this data in the table from MySQL GUI tools, and it worked perfectly. I see no "out of range" problem in these strings. Does anybody see something wrong?

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  • PHP & MySQL Pagination

    - by Francesc
    Hi. I have a MySQL query SELECT * FROM 'redirect' WHERE 'user_id'= \''.$_SESSION['user_id'].' \' ORDER BY 'timestamp'` I want to paginate 10 results per page. How Can I do it?

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  • Required help to Increase the performance of the MySQL query

    - by Joseph
    Hi all, I am using a following query in MySQl for fetching data from a table. Its taking too long because the conditional check within the aggregate function.Please help how to make it faster SELECT testcharfield ,SUM(IF (Type = 'pi',quantity, 0)) AS OB ,SUM(IF (Type = 'pe',quantity, 0)) AS CB FROM Table1 WHERE sequenceID = 6107 GROUP BY testcharfield

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  • PHP and MySql trouble

    - by Espen Arnoy
    I am having trouble making this seemingly simple MySql query work. Can anyone spot the problem? <?php include "config.php"; $offerid = $_POST["offerid"]; $ip = $_SERVER["REMOTE_ADDR"]; mysql_query("INSERT INTO voted (offerid,ip) VALUES (".$offerid.",".$ip.")"); ?>

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  • MYSQL in PHPMYADMIN - create table relationship from one table

    - by Stanley DecoWood
    I want to create a table relationship with MYSQL PHPMYADMIN. I have this Create table: CREATE TABLE students(code_students int(8)not null AUTO_INCREMENT, name_students varchar(25), age_students int(3), degree_program varchar(25), code_advisor int(8)not null, primary key(code_students, code_advisor) ); and i want to make a create table named advise relationship between code_students, code_advisor.

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  • Problem reading from 3 tables in mysql

    - by user225269
    What do I do, I need to fetch data from 3 tables in mysql, here is my current query. All of the tables contain the IDNO which has 03A45 number. But this query isnt returning any results: SELECT * FROM father, mother, parents WHERE father.IDNO=mother.IDNO=parents.IDNO AND mother.IDNO='03A45' AND father.IDNO='03A45' AND parents.IDNO='03A45' What would be the correct query for this? All of the tables have the IDNO as primary key.

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  • mysql and .net: when using tableadapters I'm getting MySqlException "insert command denied for user"

    - by Deveti Putnik
    Hi! I am using mysql as db for my asp.net application. Here are the facts: I am using connection string from web.config which has both username and password. I can do SELECT with tableadapter. When I am trying to do INSERT with tableadapter, I am getting "mysqlexception insert command denied for user" error When I try to do INSERT programatically, i.e. using connection, command object, etc. everything is fine. In this case, I'm reading connection string from web.config, too. This can be only applied to GoDaddy hosting, but on local machine I don't have this kind of problems. Can anyone suggest what can I do to make it work on GoDaddy hosting? Regards, D

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  • NHibernate MySQL Mapping Set Column Type

    - by LnDCobra
    In my MySQL database, I have the following column type. Field | Type | Null | ---------------------------------- Column_priv | set('Select','Insert','Update','References') | No | And I cannot figure out what to map this to. Can anyone tell me how I can map this to something?

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  • Using MySQL on Visual Studio 2008

    - by Diego
    I am using the ODBC connector to access a MySQL db from visual studio 2008 and i am facing performance problems when dealing with crystal reports and to solve this i need a native connector to visual studio. if someone has had a similar problem and knows a solution or tools ( freeware preferable ) , i would be really grateful.

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  • How to determine which my.cnf mysql is using

    - by japancheese
    Hello, Is there a way I can figure out which my.cnf mysql is currently using? The reason is because it's using the correct socket file to connect, but I can't figure out exactly which (if any) my.cnf it's using or trying to use so I can manually set the correct path on my local machine.

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  • Dealing with PHP server and MySQL server in different time zones

    - by Kyle Noland
    For those of us who use standard shared hosting packages, such as GoDaddy or Network Solutions, how do you handle datetime conversions when your hosting server (PHP) and MySQL server are in different time zones? Also, does anybody have some best practice advice for determining what time zone a visitor to your site is in and manipulating a datetime variable appropriately?

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  • mysql create procedure script

    - by user293487
    I am a bit confused with mysql create procedure script. My script looks like as follows: DELIMITER // DROP PROCEDURE play; CREATE PROCEDURE play() BEGIN insert into hi (name,id)VALUES ('apple','2010'); END // It does not insert into table hi.

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  • Populate a jTable Using MySQL

    - by Nathan Campos
    I have a project with a jTable called AchTable, that is like this: +-------+------+ | File | Type | +-------+------+ | | | | | | | | | +--------------+ And I have a mySQL table that is like the same, then I want to know how could I populate the jTable.

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