MySQL : Open-Source, Relational Database Management System

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pt-archiver and foreign keys?

How does pt-archiver handle foreign keys? Does it archive associated data? (seems not but the documentation is not very clear to me) And if not, how could one perform an archive of a table with all ...
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72 views

MySQL WRITE LOCK Not Preventing Inserts

This should be a simple task. Can someone tell me why the below code is still inserting rows? lock table wp_postmeta write; insert into wp_postmeta values (null, 1,'test','test'); I've checked my ...
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Question on MySQL insert race condition

I'm using MySQL 5.1, PHP 5.3 and the table is MyISAM. Here's the DTD of this very fake table: CREATE TABLE `temp1` ( `value` varchar(10) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 This ...
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43 views

Multiple selects ordering desc from single table

I'm trying to do multiple selects to give multiple ordered columns. I'm struggling to get the below mysql query to achieve the output I want. SQLfiddle: http://www.sqlfiddle.com/#!2/a1002/3 ...
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537 views

Optimization Tips For MYSQL Tuner/Primer

So I have a site that has a crap ton of traffic. I see a decent amount of latency when the site has over 1,000 active visitors on it. I have new relic installed and it seems Im only using 10% of the ...
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Architecture for a MySQL MDBS

My coworker and I are tasked with redesigning our current Access databases in a MySQL environment. Between the two of us, this wont be a problem but we need to connect to other external databases that ...
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99 views

Dealing with Multiple User Roles

I'm working on a project based on a CMS, where there is a built-in roles table. However, the CMS allows a user to have one role only using role_id And these are the requirements that struggling me: ...
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430 views

Why does this MySQL date_sub statement return wrong values?

I had a complex statement that was returning strange values and I traced it to the following line: SELECT id, updated FROM status WHERE updated > date_sub(NOW(), INTERVAL 6 MINUTE) ORDER BY ...
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615 views

“Temporary file write failure” when trying to change primary key in MySQL

In MySQL, When I trying to change primary key by this query: ALTER TABLE `resources` DROP PRIMARY KEY, ADD PRIMARY KEY (`role_id`, `category_id`, `lang`, `model`, `rule`); I execute this query ...
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92 views

Ordering a sequence of INSERT…SELECT statements to avoid a deadlock

I have the following two tables in a MySQL database: CREATE TABLE `names` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(60) NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY ...
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54 views

Modulus calculation for compound primary keys in MySQL Cluster (and other sharded databases)

In MySQL Cluster, and generally in sharded databases, how is a compound primary key's modulus calculated? Say, for example, there are two tables that have primary keys like so: CREATE TABLE Orders ...
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54 views

Corrupted Filesystem: Possible to restore databases from the contents of /var/lib/mysql?

Using CentOS 6.4 x64. Not sure what happened but somehow my VPS filesystem got corrupted and it is now in a permanent read-only state. I've been working with my hosting provider's sys. admin. but ...
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104 views

MySQL replication of single DB to same server

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large selects which locks out other updates which ...
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878 views

Error when syncing MySQL database (XAMPP) on Dropbox

I'm working on a MySQL database for local development using XAMPP, and I would like to work on two different computers. Looking online, I saw this link that gives a tutorial on syncing your database ...
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33 views

How to update all primary keys in the existing database

I'm moving mysql multi-master replication to production using tungsten. I had setup the auto increment and offset values in my.cnf file. To achieve this i'll have to update my all primary keys of all ...
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Need help in optimizing a Slow Query

I am using userpoints module to provide points for different actions that they do on my site. mysql> desc userpoints; +-------------+---------+------+-----+---------+----------------+ | Field ...
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147 views

Match unique id's on import- csv to sql

I have a csv file that I would like to import into a phpMyAdmin database (Wordpress). The CSV file is formatted as shown below: list-id | post_title | slider | ...
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57 views

Querying number of tries since last successful log, checking IP as well as user

I asked this question before on stackoverflow, but it might fit better here, since it is mainly about database performance. The actual question With performance in mind, how would you go about ...
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93 views

Significant difference between duration for querys in SHOW PROFILE and SHOW PROFILES?

I have use mysql profiler to optimize an opencart query which takes more than 10 seconds to executes. mysql> SHOW PROFILES; ...
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559 views

MySQL dump error (#1005 - Can't create table 'novephp_cz_bv.jos_jquarks_customsets' (errno: 150))

I´m trying dump mysql database from MySQL 5.1. to MySQL 5.5. But I´m getting an error "#1005 - Can't create table 'novephp_cz_bv.jos_jquarks_customsets' (errno: 150)". Problematic part of script is ...
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45 views

Getting upcoming world wide releases from a database

From my database I want to get upcoming world wide release dates for an itemId along with the platformIds. If I have a table that looks like this and the current date is 2014-05-14 ...
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511 views

How to generate data for News Feed efficiently like facebook , googleplus , twitter e.t.c?

I have created table as post ( post_id int(15) auto_increment primary key , user_id int(11) , post_text varchar(2000) , post_type int(1), ...
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MySQL: Slow Update Queries

Our database server hangs for exactly 30 seconds on random UPDATE queries. It doesn't matter what field type the query is updating, it just seems like random selection. There are a few applications ...
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81 views

Why doesn't this query limit results by first and last name?

I have an ugly query, horrible table names courtesy of MySQL Workbench, and a severe lack of planning on my part to change to less verbose names prior to actually writing the code. Try to move past ...
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5k views

MySQL server taking up 100% CPU

I'm managing a site that does streaming video, the site is running off: Intel(R) Xeon(R) CPU E31220 @ 3.10GHz 16 GB RAM 2 x 2TB RAID1 1gbit unmetered bandwidth is not an issue as the ...
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230 views

What is a loose index scan?

I was reading that MySQL can not use an index on 2 range conditions due to not having a "loose index scan" What exactly does this mean? Is it related to the underlying or the implementation of the ...
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3k views

Table already exists error when trying to import sql file

I am trying to upload a backup sql file through phpMyAdmin. I create the empty db with the same db name as in my import file in phpMyAdmin then use the import function selected from within this empty ...
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185 views

MULTIPLE INSERT VALUES with INSERT into another table

here a scenario to have a more clear picture. The DB is MySQL. I've 2 tables events and *event_users* : EVENTS id int type int date date time time ... EVENT_USERS event_id ...
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447 views

using Aria vs InnoDB vs MyISAM

I was wondering (if anyone knows) if Aria database is crash safe . I had some tables with MyISAM which were getting corrupted very often and switch them to InnoDB . However innodb is a bit slower and ...
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61 views

Move all InnoDB databases into one subdirectory (innodb_file_per_table is ON)

First of all, excuse my English. I want to run a MySQL 5.6 on ZFS volume, and need to move all InnoDB databases to one subdirectory (which in fact will be a different ZFS filesystem). For example, by ...
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171 views

What do spikes in InnoDB lock structures indicate?

I co-maintain a high traffic site similar to StackExchange. It runs MySQL 5.1 (working on replacing it with MySQL 5.5 or MariaDB). All our tables are InnoDB. MySQL goes down a couple of times a day. ...
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38 views

“dynamic set” in a MySQL table

I have a table where one column will have a few values many times (maybe 20 different values). Now I would like to use something like the set to improve performance and memory consumption. The problem ...
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1k views

Solved Mysql connection lost with HAProxy

I have master-master replication with mysql. and haproxy configured front of my master-master replication. When I connect my replication via HaProxy, mysql says that "MYSQL has gone away". But when I ...
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209 views

Master and slave tables with different character sets - will replication break?

We have some huge tables in our MySQL 5.6 database that have latin-1 as their character set, and want to convert them all to UTF-8 (along with converting the database's global character set). The ...
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169 views

Distribute records on different MySQL databases - MySQL Proxy alternative

My scenario is the following: Right now I am using one big MySQL database with multiple tables to store user data. Many tables contain auto increment columns. I would like to split this into 2 or ...
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964 views

MySQL: Upgraded from 5.1 to 5.6 - no problem?

We're using Yum to maintain MySQL and our MySQL server only hosts a largish Drupal database. We recently upgraded via Yum from 5.1 to 5.6. The process went like so: Ran a mysqldump --all-databases ...
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MySQL query hanging on copying to tmp table

I'm stuck with a query hanging on 'copying to tmp table' for about 25 seconds according to the profiling. The query is used for forecasting the number of results after filtering by job_type / ...
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62 views

crossplatform mysql_install_db script in mysql 5.5.34 on Windows

I downloaded mysql-5.5.34-win32.zip and found out there is mysql_install_db.pl script. However mysql 5.5 documentation says: mysql_install_db is a shell script and is available only on Unix ...
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357 views

Upgrading from MySQL 5.5 to 5.6 - timestamp issue?

I'm looking at upgrading my Percona Server setup from 5.5 to 5.6. Reading the upgrade docs from MySQL sounds mostly straightforward except for anything involving time/date columns. As far as I can ...
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213 views

restore using mysqlbinlog failing

While doing restore from a MySQL binary log file, it is failing with the following error . mysqlbinlog mysql-bin.000036 | mysql -u root -p asdb ERROR 1032 (HY000) at line 48: Can't find record in ...
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496 views

USING to join multiple tables with same field

I have 4 tables, each with a common field QuestionnaireId. I am wondering if there is any difference in output or performance difference between using USING on the field in each join or by specifying ...
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384 views

How to set selinux permission for non-standard mysql bin log path?

By default, mysql bin log works in folder /var/log/mysql. but moving to any other share such /mylogs/mysql gives permission error. Below is the exact message: usr/sbin/mysqld: File ...
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46 views

Find repeating tickets with more than one criteria

Lets say I have 2 tables: atms & tickets each atm has many tickets. ATM table: ID | NAME ------------------------- A0109 | ATM 1 A0227 | ATM 2 etc. | etc. Ticket table: ID | ATM | ...
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52 views

Does union all have an enforced ordering

I know that a union does a de-duplication so can jumble the results, but I can't find a definitive answer for union all Example query select id from ( select id from table where id = 1 union all ...
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2k views

Amazon RDS - Can't access MySQL DB from local machine

I read many questions/answers here but they are from a different interface from AWS Console. I created a DB Instance but can't create a rule in the security groups that's allows me to connect from my ...
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162 views

How to join the tables in mysql to get wall messages and comments with name of person ? Only user and his friends messages

I have four tables in my mysql database as shown in the image url provided. I want to select data from the tables without duplication. I want to show messages and comments on wall according to the ...
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MySQL database problems all of a sudden— users' programs can't connect, I saw error 2013, error 32

I am editing my problem, based on what I've researched and done: Hi This is mysql running on an osx server. We suddenly have an issue where only one of anything can seem to connect to mysql at ...
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71 views

Mysql Replication Master/Slave and Master/Master

Looking for some insight and opinions from some DBAs, as I've been tasked to look into using Master/Master replication for a single table in a database. We currently run mysql replication using a ...
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Issue with MySql upgrade from 5.1 to 5.6 for Jboss SOA - p v 4.3

We are using JBoss SOA P v- 4.3, we have recently upgraded Mysql version to 5.6 from 5.1 and are facing some issue with the jboss start up. We are using MySQL instead of Hypersonic database for Jboss ...
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569 views

Prepared statement execution with variable number of parameters to be bound

Some stored procedures I work with need to interpolate WHERE criteria based on if procedure input parameters have been supplied. To avoid potential injection points, I'd like to utilize parameter ...