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  • How can artificially create a slow query in mysql?

    - by Gray Race
    I'm giving a hands on presentation in a couple weeks. Part of this demo is for basic mysql trouble shooting including use of the slow query log. I've generated a database and installed our app but its a clean database and therefore difficult to generate enough problems. I've tried the following to get queries in the slow query log: Set slow query time to 1 second. Deleted multiple indexes. Stressed the system: stress --cpu 100 --io 100 --vm 2 --vm-bytes 128M --timeout 1m Scripted some basic webpage calls using wget. None of this has generated slow queries. Is there another way of artificially stressing the database to generate problems? I don't have enough skills to write a complex Jmeter or other load generator. I'm hoping perhaps for something built into mysql or another linux trick beyond stress.

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  • MySQL 5.1.34 on NFS w/NetApp

    - by shrisha
    Is this still a bad idea? I know older versions of MySQL performed poorly with NFS. I imagine the issue lies with the usage of fsnc() and/or O_DIRECT. If the issues are mostly resolved, are there common pitfalls/gotchas, specifically around a large (multiple tables with tens of millions of records) InnoDB database that may see up to 20-50 reads/sec

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  • Changing the character encoding of a MySQL database

    - by Julien Genestoux
    Our whole application is now able to handle UTF-8 and it will be our choice in terms of encoding all across our architecture. The last step is to change the encoding of our MySQL databases. Of course, ALTER TABLE db_table CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; should be able to convert each of the tables to the right UTF8 encoding, yet, is there anything else I should do? I believe that the my.cnf configuration file needs to be changed as well.

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  • Graphical MySQL tools

    - by Shlomo Shmai
    Are there any good graphical tools (preferably free) for navigating a MySQL database? I find myself doing a lot of the same SQL queries to look at data in the tables. I would imagine there's a GUI for doing this that makes life easier. Any one know of such a thing? Thanks a lot.

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  • MySQL: table is marked as crashed

    - by DrStalker
    After a disk full issue one of the MySQL DBs on the server is coming up with the following error when I try to back it up: [root@mybox ~]# mysqldump -p --result-file=/tmp/dbbackup.sql --database myDBname Enter password: mysqldump: Got error: 145: Table './myDBname/myTable1' is marked as crashed and should be repaired when using LOCK TABLES A bit of investigation shows two tables have this issue. What needs to be done to fix up the damaged tables?

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  • Phpmyadmin mysql foreign key problem

    - by alan
    Hey guys i'm using phpmyadmin (php & mysql) and i'm having alot of trouble linking the tables using foreign keys. I'm getting negative values for the field countyId (which is the foriegn key). However it is linking to my other table fine and it's cascading fine. So when I go to add data there will be a drop box for the CountyId and the values will look something like this, " -1 1- " Here is my alter statement, ALTER TABLE Baronies ADD FOREIGN KEY (CountyId) REFERENCES Counties (CountyId) ON DELETE CASCADE

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  • Upload database backup from mysql to Amazon S3 or Glacier without creating local file

    - by Rubem Azenha
    Is there a tool that makes possible to backup a Mysql database to Amazon S3 or Amazon Glacier without having o create a local file with the database contents? Something like that: mysqldump -u root -ppass -h host --all-databases | magical-s3-tool s3-bucket backup-yyyy-mm-dd.sql This magical tool would use the pipe data and transfer the backup data directly to S3, without creating a local file.

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  • Where Are Databases Located - MySQL File Location

    - by nicorellius
    I just installed a CRM application with a MySQL database. I thought I new the name of the database but I can't find it. Now I am trying to perform a mysqldump but I don't know the name of my database or where it's located. Most docs I read assume the admin knows where this database is located and thee name of it - I should know this, I know.

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  • I'm managing SQLite, MySQL and PostgreSQL databases and want a tool for this locally

    - by littlejim84
    I develop web applications on Mac OSX in SQLite, MySQL and PostgreSQL and these are then put on the webserver. I want to be able to take the brunt out of looking at the terminal locally when dealing with these databases - is there any software available (free or otherwise) that can handle all three of these database technologies in a GUI for the Mac that is actually decent and worth it?

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  • Cheap web hosting that supports php/mysql

    - by Cortopasta
    Does anyone know where I can find web hosting that supports php/mysql? I'm just using it to practice updating/changing live web sites, and to run code in an environment other than my XAMP stack on my thumb drive. It doesn't need to be fast or able to use a lot of bandwith, just somewhere I can play with code to sharpen my skill set

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  • MySQL “filegroup”??

    - by Xaitec
    Coming for using Sql Server where there are file-groups, i was wondering if there is (i'm sure there is) something similar in MySQL. After all the database cant be limited to just one hard drive( if using windows that is). I've tried to search but its hard to find the something that you don't know the name of!.

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  • Automating MySQL configuration with kickstart

    - by Nimmy Lebby
    I've been testing deployment for a website with some virtual servers. I have most of my deployment steps done via kickstart file (package installation and user creation). However, for MySQL I have to: Run mysql_secure_installation (sets up root password, deletes anonymous users, disallows root login remotely, removes test databases) ./ Then, create the website's databases and the database user. I'm not sure if this is possible in kickstart---especially the prompts in mysql_secure_installation. Perhaps someone has some suggestions or examples?

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  • MySQL Backup - incremental

    - by Tiffany Walker
    I know that you can use mysqldump. I am currently dumping the following way: ${MYSQLDUMP} --single-transaction -u ${MUSER} -h ${MHOST} -p${MPASS} $db | ${GZIP} -9 > $FILE From my understanding this locks the database and prevents any type of use of the database and can even lock up websites. Is there a better way to maybe do daily/hourly backups of the MySQL database should the database be in the 100mbs and even 1gbs in size?

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  • Syncronizing XML file with MySQL database

    - by Fred K
    My company uses an internal management software for storing products. They want to transpose all the products in a MySql database so they can do available their products on the company website. Notice: they will continue to use their own internal software. This software can exports all the products in various file format (including XML). The syncronization not have to be in real time, they are satisfied to syncronize the MySql database once a day (late night). Also, each product in their software has one or more images, then I have to do available also the images on the website. Here is an example of an XML export: <?xml version="1.0" encoding="UTF-8"?> <export_management userid="78643"> <product id="1234"> <version>100</version> <insert_date>2013-12-12 00:00:00</insert_date> <warrenty>true</warrenty> <price>139,00</price> <model> <code>324234345</code> <model>Notredame</model> <color>red</color> <size>XL</size> </model> <internal> <color>green</color> <size>S</size> </internal> <options> <s_option>some option</standard_option> <s_option>some option</standard_option> <extra_option>some option</extra> <extra_option>some option</extra> </options> <images> <image> <small>1234_0.jpg</small> </image> <image> <small>1234_1.jpg</small> </image> </images> </product> </export_management> Some ideas for how can I do it? Or if you have better ideas to do that.

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  • MySQL simple replication problem: 'show master status' produces 'Empty set'?

    - by simon
    I've been setting up MySQL master replication (on Debian 6.0.1) following these instructions faithfully: http://www.neocodesoftware.com/replication/ I've got as far as: mysql > show master status; but this is unfortunately producing the following, rather than any useful output: Empty set (0.00 sec) The error log at /var/log/mysql.err is just an empty file, so that's not giving me any clues. Any ideas? This is what I have put in /etc/mysql/my.cnf on one server (amended appropriately for the other server): server-id = 1 replicate-same-server-id = 0 auto-increment-increment = 2 auto-increment-offset = 1 master-host = 10.0.0.3 master-user = <myusername> master-password = <mypass> master-connect-retry = 60 replicate-do-db = fruit log-bin = /var/log/mysql-replication.log binlog-do-db = fruit And I have set up users and can connect from MySQL on Server A to the database on Server B using the username/password/ipaddress above.

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  • Best way to migrate from MySQL to PostgreSQL

    - by user37994
    Hi, I have to migrate a MySQL database to PostgreSQL. I have tried the mysqldump with --compatible = postresql. I have seen that some poeple use ETL like Talend to make the migration but you must describe the migration for all tables... (I have 39 tables...) Any other idea ? Thanks in advance

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