MySQL : Open-Source, Relational Database Management System

learn more… | top users | synonyms

0
votes
0answers
9 views

How do I build a mysql LAN out of scratch? What do I need?

I have mysql workbench, is that all the software I need? I am trying to connect 6-7 different computers together using a LAN onto a mysql server and I dont know where to begin. Any helpful links ...
1
vote
2answers
23 views

Are there benefits to using more than 4 CPUs for MySQL?

We are running MySQL 5.5 on linux under VMWare, running on 2 CPUs. We are planning on increasing this to 4, but we have un-used CPUs available, and I'm wondering if there is any benefit to increasing ...
1
vote
2answers
21 views

How to do the complex nested select SQL?

I have two tables, table1 is as following, id is primary key, table2_id is foreign key id date aid table2_id message 1 2014-03-19 16:21:02 121 1 login from xxxx 2 ...
0
votes
0answers
21 views

slow writes on percona server only when replication is running

Hi I am trying to migrate to percona server from mysql 5.6 on windows. In my development machine for percona is running of centos 6.5 which is installed on vmware 5.5 sphere. Our business ...
2
votes
2answers
28 views

How to monitor InnoDB Disk I/O using Server Status Variables?

This question is extension of my previous question "How to monitor InnoDB Disk I/O Required for MySQL? " As mention in my previous question i want to count total number of disk i/o per query, but ...
2
votes
1answer
35 views

Need scalable database solution for very big automated data entry database

I've been working on MySQL database in simple web applications for a long time and i now have a project which should maintain about 1,000 up to 10,000 query per minute (it is some logging database ...
0
votes
2answers
34 views

What is the best choice for MySQL high availability (zero downtime)? [on hold]

As I know there are many solutions for MySQL HA, but most of them are congenitally not zero downtime solution, like MHA, AWS RDS... That said, if zero downtime is "must have", the only choice is ...
1
vote
2answers
32 views

SQL - query multiplying records returned - Cartesian Product

I am using the following query which is returning a huge number of multiplied records - i.e. a cartesian product: SELECT * FROM specimen, topography_index, morphology, functions WHERE ...
0
votes
1answer
18 views

Omitting [INTO] in the INSERT … SELECT statement

Does the INTO keyword only makes the query more readable, or does it bring another benefits as well? The queries beneath both seem to run equivalently . insert ignore tbl (type, details) values ('1', ...
0
votes
1answer
20 views

MySQL EXECUTE formula from table field

I am attempting to run an UPDATE function where the formula for the updated field is provided by a related table as a string. Example, I want to update a field named HOURS in TableA based on a formula ...
0
votes
1answer
17 views

Access Sharing database over Network vs Mysql multiple users

Something no one mentions and I find important to stress is that Access has a file locking mechanism for sharing the database on a network share which is orders of magnitude more efficient than any ...
2
votes
1answer
25 views

Optimize Percona MySQL InnoDB 3.2TB database

(Before you will call me an idiot or start laughing, please remember it's a real deal on my side and I cannot cancel this assignment as it is a part of a bigger project) I have a database server that ...
0
votes
0answers
10 views

Disable procedures for data load in MySql using Innodb engine

I have a database with an integrated ledger for a multi-unit company. As we bring new units into the database we load their existing ledger data into ours. Unfortunately the existing procedures on the ...
0
votes
1answer
28 views

MySQL: How to clean MySQL from RHEL5?

I have installed MySQL 5.1.73 community edition through RPM. It was working fine. I uninstalled this version by using yum remove mysql-server command. I wanted to upgrade MySQL from 5.1.73 to 5.6.19 ...
1
vote
0answers
23 views

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 ...
2
votes
2answers
47 views

How to monitor InnoDB Disk I/O Required for MySQL?

I am doing an estimate on how much i/o[disk read write] on Mysql 5.6 [innodb storage engine], for getting idea how to calculate total number of disk read write i have searched a lot on SO on DA and ...
0
votes
1answer
21 views

MySQL ON DUPLICATE KEY UPDATE performance issue

We have a table with over 200k rows. Every row belongs to a category, there are almost 50k rows per category. What is the best way to update all rows of that category? We are using a script like ...
-2
votes
1answer
30 views

Can I install MySql and Oracle 10g both Databases in same machine?

I have MySql Installed in my windows 7 machine and PHP on IIS. Now i need Oracle 10g anyway.I'm having king of dilemma to install Oracle 10g. If i can do so please suggest necessary steps and ...
0
votes
1answer
16 views

Good configuration for 2gb (my.cnf) [duplicate]

I'm little newbie in configuring mysql and i seek a good configuration for mysql i have one site in ajax with many query and very slowly with VPS Iam in kimsufi 2gb i run only mysql in vps not apache ...
1
vote
1answer
16 views

How to make MySQL join one-to-many with lowest value?

I have following database structure Domain has many URL which has many positions which belongs to phrase which belongs to user which belongs to subscription. In subscriptions table I have period ...
0
votes
1answer
15 views

Want to create partitions of a MySQL table and change the charset of new partitions

I have a database table which contains large amount of data. I have written a script to create new partitions every week and drop old partitions (which are of no use). Currently, I have a column in ...
0
votes
1answer
14 views

How can I perform this database backup/sanitization task?

I have a 3-node MariaDB/Galera cluster. I need to do two things: Back up the database regularly (multiple gigs in size) for a normal, in-case-everything-crashes-I-can-restore-from-this backup. Have ...
1
vote
1answer
15 views

MRG_MyISAM with myisampack tables blocking inserts

I'm using INSERT_METHOD=FIRST and compressing all tables that are members of the union but when I try to insert into the MRG_MyISAM table it tries to insert into the second one (instead of the first). ...
0
votes
0answers
33 views

Optimization mysql very slowly [duplicate]

Hello I have a server in kimsufi 2gb RAM and 500gb storage but the query with php mysql is very slowly I have change innodb buffer pool size to 500M but i have error too many connections, i add max ...
0
votes
1answer
27 views

InnoDB issue after power outage a few weeks ago - no backup

A few weeks ago we had a power outage on one of our web servers that hosts several websites, we didn't think it affected anything and everything came back up as normal as far as we were aware. I have ...
2
votes
2answers
68 views

Why is this simple join taking so long?

I'm trying to run some reporting queries on a MySQL database, and I'm running into serious performance issues for some reason. One table, page_views, is extremely large (~70 million records), so some ...
1
vote
0answers
25 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 ...
0
votes
0answers
15 views

Parent/child relationship or not if the name of the field implies the relationship?

I am working with the harmonized system and try to catalog this in a MySQL database. This works for example like this: 01 LIVE ANIMALS 0101 horses, asses, mules and hinnies, live 0102 bovine ...
0
votes
0answers
29 views

MySQL SSL replication not using SSL connection

I'm running into an issue while setting up MySQL SSL replication between two Windows servers in a Master-Slave configuration. I followed the instructions [here][1] to set up MySQL replication. The ...
0
votes
2answers
14 views

How do I extract row/column elements from multiple tables with same schema in single query

My question is as follows: Given that I have three tables with exactly the same column names and exactly the same keys for the "name" column e.g. Table r name | A | B | C ----------------- elem1| ...
0
votes
0answers
6 views

Error while running automysqlbackup

I have setup automysqlbackup on Centos for a server with approximately 52 databases. I did try to increase the max_connections to 250 and max_allowed_packet to 100M, however that did not solve the ...
0
votes
0answers
17 views

Multiple client tables or large overall table

I've recently taken over a project linking to a large MySQL DB that was originally designed many years ago and need some help. Currently the DB has 5 tables per client that store their users ...
0
votes
0answers
12 views

Error Code: 1133. Can't find any matching row in the user table

Im reading O'Relly "Learning MySQL" and it says that you can create a user in MySQL by doing just this: mysql> GRANT ALL ON *.* TO 'jill'@'%.invyhome.com' IDENTIFIED BY 'the_password'; Query OK, 0 ...
0
votes
0answers
14 views

Auto backup only for MySql database and selected folders in WHM or via cron job command

Hell all i have a VPS, WHM provide use auto backup feature. but i want only backup some selected database and folder. i try to use command via cron job but its not working. current code (not ...
0
votes
0answers
20 views

Creating a table for indexing another table

We have a table with 350m rows and 12 columns, and around 1m rows adding everyday. We have crappy hardware and we cannot add an index on one of the 12 columns that we really really need to. (severe ...
0
votes
1answer
30 views

MySQL (or MariaDB) multi-master without MMM

I've been reading blogs on MySQL multi-master setup. The way I've used MySQL replication in the past was master-slave where if the master died (or was being taken down for maintenance) we would shut ...
1
vote
1answer
26 views

pt-table-checksum and row-based replication

The set up I work with is MySQL 5.5 in a master-slave replication configuration, but we have to use "MIXED" replication (statement and row-based) because we use an application that requires it, and it ...
0
votes
1answer
22 views

Using Galera for simple master-master replication

I was reading the documentation and it specifically mentions that a Galera DB cluster must have at least three nodes to achieve Quorum, although our current setup is working with two. I am tasked ...
1
vote
1answer
21 views

MySQL replication working fine, but still shows “Waiting for master to send event” at 280000 seconds

To repeat the title: MySQL replication working fine, but mytop still shows a thread "Waiting for master to send event". It has been like this for a few days, and is now at 280000 seconds. But ...
0
votes
0answers
12 views

Performance hit from moving DB to another drive symlink? [migrated]

We're considering moving one database (there are 4 of them in total) with InnoDB tables, to a separate partition in a Ubuntu 14.04 VPS. This DB gets read/write intensive (500 writes per sec, about ...
1
vote
1answer
31 views

Safely changing innodb_buffer_pool_size on MySQL replication master?

We have a MySQL server which is a replication master. We need to change the innodb_buffer_pool_size and innodb_flush_method to (hopefully) improve performance as the database has grown. What is the ...
0
votes
1answer
16 views

What kind of data type to use for numbering in the Harmonized System?

The harmonized system uses a numbering that shows the hierarchy between different items. Similar to bookkeeping ledger numbers. Here is an example: 01 LIVE ANIMALS 0103 swine, live 010310 Purebred ...
0
votes
1answer
26 views

How to install TokuDB on MAMP

I'm by no means a DB admin. Just a hobbyist actually, and more of a programmer than a database person. I have MAMP 3.05, PHP 5.5.10, Mac OSX 10.9.3. I have a big suite of PHP applications and a ...
0
votes
0answers
22 views

Store both a city and its region?

I store various events (such as a search on the site) into a table (in fact I have two tables: one for the event and other (linking to the first) with characteristics of the event). Each city belongs ...
0
votes
1answer
20 views

Optimizing a query so MySQL will use the indexes for the joins

Some context: migrating some data from a 3rd party cloud MongoDB platform service into MySQL. Wrote a query but it's very slow. Here's the query: SELECT Table1.*, (long list of fields for each ...
0
votes
1answer
42 views

Dedicated mysql server slow response

I have server in Kimsufi with 2gb RAM but my server is very slow , with simple hosting in ovh it responds quickly ... With pingdom.com test i have for server: 10 sec and simple hosting: 2sec is ...
2
votes
2answers
43 views

Whats row size in mysql?

i mean what does it mean ?, i have mysql db and table in myisam and it shows Space usage Type Usage Data 1.3 GiB Index 429.1 MiB Total 1.7 GiB Row Statistics Statements Value ...
0
votes
0answers
7 views

MySQL Associative Weak Entity

I'm working on a project in MySQL that has a table of users who have favorite foods. Favorites is an associative entity between Users and Foods. I want the Favorites table to be a week entity of the ...
-1
votes
1answer
25 views

60M+ InnoDB table simple query performance HELP

I know it is a repeated question but really need help here. What can I do to improve the performance of this query? Considering that I have no freedom to change system variables/configs :( Thanks in ...
0
votes
1answer
18 views

Mysql functions for web apps

I have few questions about using functions in a MySQL database for plugins and extensions of web apps like Magento or Wordpress. Mostly this is for a few extensions I want to do for Magento. The ...