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• Partitioning mySQL tables that has foreign keys?

  - by Industrial

  Hi! What would be an appropriate way to do this, since mySQL obviously doesnt enjoy this. To leave either partitioning or the foreign keys out from the database design would not seem like a good idea to me. I'll guess that there is a workaround for this? Update 03/24: http://opendba.blogspot.com/2008/10/mysql-partitioned-tables-with-trigger.html http://stackoverflow.com/questions/1537219/how-to-handle-foreign-key-while-partitioning Thanks!

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• how to repopulate/recreate autoincrement in mysql

  - by JPro

  I want to know if I can repopulate the autoincrement value in mysql. Because, I have records that look similar: ID Name 1 POP 3 OLO 12 lku Basically , I want a way to update the ID to this ID Name 1 POP 2 OLO 3 lku Is there any way to do this in mysql? Thanks.

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• MySQL create memory leak in Tomcat

  - by mabuzer

  I have set a JDBCRealm for web-app inside tomcat, and when I reload it I got this from tomcat: SEVERE: A web application registered the JBDC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. I use tomcat 6.0.24, with MySQL Connector 5.1.10,,,

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• MySQL vs PostgreSQL for Web Applications

  - by cnu

  I am working on a web application using Python (Django) and would like to know whether MySQL or PostgreSQL would be better when deploying for production. In one podcast Joel said that he had some problems with MySQL and the data wasn't consistent. I would like to know whether someone had any such problems. Also when it comes to performance which can be easily tweaked?

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• Glib-Error MYSQL????

  - by sam

  Hi guys, I got this Error when querying MYSQL Database: Glib-Error **: gmem.c:173:falied to allocate 216000000 bytes aborting.. Do anybody have some explanations? I am using MYSQL Query Browser. thanks

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• Migrate SQLExpress to MySQL datetimeoffset issue

  - by Matt

  Hi, i'm trying to migrate from sqlexpress to mysql, and am having an issue with the DateTimeOFfset(7) field in one of my tables. MySQL is refusing to handle it.. Is there a way to get around this?

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• MySQL UPDATE problem

  - by comma

  I know the following MySQL code is not correct can some help me fix this code to use both tables I'm trying to grab the id from learned_skills and skill_id from users_skills for AND skill_id = id Here is the MySQL code. SELECT learned_skills.*, users_skills.* UPDATE learned_skills SET skill = '$skill', experience = '$experience', years = '$years' WHERE user_id = '$user_id' AND skill_id = id

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• SQL Server 2008 and MySQL Daily Backups

  - by Tyler

  Is there a quick and easy way to backup both SQL Server 2008 and MySQL, all their databases? Right now I have a batch script that runs, but I have to manually add a database each and every time, and I'm sick of maintaining it. So I want to set it up to backup all SQL Server and then all MySQL, I dont care if its two different solutions, just want the ability to backup all the databases without having to type them in. Thank you.

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• Explicit disable MySQL query cache in some parts of program

  - by jack

  In a Django project, some cronjob programs are mainly used for administrative or analysis purposes, e.g. generating site usage stats, rotating user activities log, etc. We probably do not hope MySQL to cache queries in those programs to save memory usage and improve query cache efficiency. Is it possible to turn off MySQL query cache explicitly in those programs while keep it enabled for other parts including all views.py?

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• synchronize ms access and mySQL in different host

  - by Margareth

  Hi, Would like to ask is there any way to synchronize Ms Access and mySQL but are hosted in different hosting. If I update the Ms Access, the mySQL database in different Host is updated automatically. Thank you.

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• getting mysql_insert_id() while using ON DUPLICATE KEY UPDATE with PHP

  - by julio

  Hi-- I've found a few answers for this using mySQL alone, but I was hoping someone could show me a way to get the ID of the last inserted or updated row of a mysql DB when using PHP to handle the inserts/updates. Currently I have something like this, where column3 is a unique key, and there's also an id column that's an autoincremented primary key: $query ="INSERT INTO TABLE (column1, column2, column3) VALUES (value1, value2, value3) ON DUPLICATE KEY UPDATE SET column1=value1, column2=value2, column3=value3"; mysql_query($query); $my_id = mysql_insert_id(); $my_id is correct on INSERT, but incorrect when it's updating a row (ON DUPLICATE KEY UPDATE). I have seen several posts with people advising that you use something like INSERT INTO table (a) VALUES (0) ON DUPLICATE KEY UPDATE id=LAST_INSERT_ID(id) to get a valid ID value when the ON DUPLICATE KEY is invoked-- but will this return that valid ID to the PHP "mysql_insert_id()" function? Thanks for any advice.

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• mysql datetime performance

  - by praksant

  Hi, since in mysql datetime field is represented as string (i'm not sure how it works internally), wouldn't be from performance point of view faster to store date as unix timestamp? I don't need to use any mysql native date functions, i'm going for performance of sorting and selecting data. if there was an index for that column, would be difference between int and datetime? Thank you

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• htmlentities() in MySQL

  - by gAMBOOKa

  I've got regexes inserted directly into a MySQL database, how do I convert html entities to their safe equivalents using a MySQL query? EDI: The data is already in the database.

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• Database EAV model, record listing as per search

  - by Shyam Sunder Verma

  I am building a dynamic application. I have three tables : ( EAV model style) 1: Items ( ItemId, ItemName) 2: Fields (FieldId, FieldName) 3: Field Values ( ItemID, FieldId, Value) Can you tell me how to write SINGLE query to get starting 20 records from ALL items where FieldId=4 is equal to TRUE. Expected Result : Columns = ItemID | Name | Field1 | Field2 | Field3 Each Row= ItemId | ItemName| Value1 | Value2 | Value3 Important concerns : 1: Number of fields per item are not known 2: I need one to write ONE query. 3: Query will be running on 100K records, so performance is concern. 4: I am using MySQL 5.0, so need solution for MYSQL Should I denormalize the tables if above query is not possible at all ? Any advice ?

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• How to switch from MSSQL to MySQL for using with Excel pivot

  - by Sim

  Hi all, I have a table that contains sales transaction (~20 mil rows). Previously I used MSSQL and export it to an Excel pivot. Data refresh took 10-15 minutes but still do-able. However, after I migrated to MySQL (using XamppLite & ODBC), it took forever to refresh the data in the Excel pivot. Maybe I didn't optimize the MySQL good enough ? Anyone can share some thoughts 'bout this ? Thanks

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• Make CMD sensitive to use with MySQL?

  - by acidzombie24

  I have a cleanup scrip in a bat file and i wanted to do the below but the problem is i get a mysql error saying unknown database and showing it as testdb. I guess i can change my code testdb but i would like to know. How do i have windows cmd use case sensitivity so i can execute queries properly instead of always in lower case? mysql.exe -u root -q "drop database TestDB; create database TestDB;"

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• Adding metadata attributes to MySQL table

  - by Jack

  I would like to add custom attributes to a MySQL table which I can read via php. These attributes are not to interfere with the table itself - they are primarily accessed by php code during code generation time and these attributes HAVE to reside in the DB itself. Something similar in concept to .NET reflection. Does MySQL support anything like this? Thanks.

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• Stored Procedure with ALTER TABLE

  - by psayre23

  I have a need to sync auto_increment fields between two tables in different databases on the same MySQL server. The hope was to create a stored procedure where the permissions of the admin would let the web user run ALTER TABLE [db1].[table] AUTO_INCREMENT = [num]; without giving it permissions (That just smells of SQL injection). My problem is I'm receiving errors when creating the store procedure. Is this something that is not allowed by MySQL? DROP PROCEDURE IF EXISTS sync_auto_increment; CREATE PROCEDURE set_auto_increment (tableName VARCHAR(64), inc INT) BEGIN ALTER TABLE tableName AUTO_INCREMENT = inc; END;

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• Best Workaround with LIMIT subquery MySQL

  - by Hiyasat

  Hi all, i want to create Stored PROCEDURE with multi statement, and it not working , and Google the problem and found that mysql dose not support Subquery statement "MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'" My statement like this: DROP PROCEDURE IF EXISTS proc_Name; CREATE PROCEDURE `DBName`.`proc_Name`() BEGIN SELECT FROM table1 WHERE ORDER BY table1_Colom LIMIT 100; UPDATE table2 SET table2_colom1 = 1 WHERE ID IN (SELECT ID FROM table2 ORDER BY table2_colom1 LIMIT 100); END ; Thanks in Advanced

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• MySQL database Int overflow and can't login in.

  - by Ryan SMith

  I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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• MySQL data file won't shrink

  - by Midhat

  My ibdata1 file for MySQL database grew to about 32GB over time. Recently I deleted about 10GB of data from my databases (and restarted mysql for good measure), but the file won't shrink. Is there any way to reduce the size of this file

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• MySQL 5.1 / phpMyAdmin - logging CREATE/ALTER statements

  - by pako

  Is it possible to log CREATE / ALTER statements issued on a MySQL server through phpMyAdmin? I heard that it could be done with a trigger, but I can't seem to find suitable code anywhere. I would like to log these statements to a table, preferably with the timestamp of when they were issued. Can someone provide me with a sample trigger that would enable me to accomplish this? I would like to log these statements so I can easily synchronize the changes with another MySQL server.

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• Request for comments: Ruby script that counts the length of a MySQL table name

  - by bakerjr

  Hi, I'm new at ruby and I would like to ask you guys if there's something that could improve my Ruby code. Here's my script: #!/usr/bin/ruby -w require 'mysql' dbh = Mysql.real_connect('localhost', 'db_user', 'password', 'db_table') tables = dbh.query('show tables') tables.each do |table| puts "#{table}" + " (" + "#{table}".length.to_s + ")" end I'd love to hear your comments. Thanks in advance

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• MySQL app with Cassandra in mind

  - by SODA

  I am planning to make a web app which will eventually use Cassandra. But now that I don't have it and don't have server(s) to run it from, I'd like to start by using MySQL. The question is, is it possible to structure data and queries in such a way that it would be fairly easy to later port it to Cassandra? Main idea, I guess, would be writing MySQL queries that would be possible to change to same Cassandra queries. Maybe you have a better suggestion?

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• MySql not storing foreign characters correctly

  - by acidzombie24

  On SQLITE this way fine. I switch to mysql and instead of ??? i get ???. The column is TEXT or sometimes VARCHAR(255) (i believe its VARCHAR(255) in this case). How do i have mysql save the characters properly?

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