MySQL : Open-Source, Relational Database Management System

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What's the approach to figure out reason for mysql crash?

The database I'm using crashes a lot recently. And I can't find a decent way to dig into the issue. I looked into mysql error log, but don't know how to start. I know there was a "load data infile" ...
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4k views

Moving mysql datadir cause info: checking for tables which need an upgrade

So after moving the data directory to another partition, I get this error: [info] checking for tables which need an upgrade, are corrupt or were not closed cleanly. This is on Debian 7.5. The ...
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112 views

How to access another Connect server table in my Local server in SQLyog 7.01?

In same server name using same database select * from area;(Working Good) Same Servername but Different Database select * from mysql.event(Working Good) Now i am connection TWO Different server ...
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1answer
75 views

MySQL: UNION query to get a line for each date

Table1 DATE SKU QTY 2015-06-20 ABCD 3 2015-06-20 ABCD 1 2015-06-21 ABCD 5 2015-06-23 ABCD 2 2015-06-20 EFGH 1 2015-06-21 EFGH 3 Table2 DATE ...
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1answer
44 views

DB Schema design : single table with more columns vs multiple tables with fewer colomns

What would be better DB design for a social network website. A single table with more columns and less rows or multiple table with fewer columns but more rows. For example: User can post an update on ...
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24 views

MySQL stored procedure updates twice

I have this stored procedure: DELIMITER $$ CREATE PROCEDURE updateTrendContentStats(IN mongoid VARCHAR(255),IN numericid INT,IN points INT,IN ctype INT,IN activity INT,IN created INT) BEGIN DECLARE ...
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1answer
382 views

MySQL: Optimize query with a range and distinct count

I have a query on a large table with millions of rows that looks like this: SELECT COUNT( DISTINCT clicks.tx_id ) AS unique_clicks_count , clicks.offer_id FROM clicks WHERE ...
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2answers
24 views

Select data where column value exists in seperate rows for same reference id

This is on a MySQL database. Locations have services. What I want is to get all results where service_id is 2 AND 3, not OR so using IN is out I believe. Database ---------------------------- | ...
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Multi-table optimal database design

I'm a bit new to the database design. Thus this question to people who may have more experience. I need to design a database that needs to store statistical data for many systems. The data is ...
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449 views

Mysql - How to Optimize Retrieval Time in a Table

I have query like this! which has 200 million Records in a single table.. I am using BTree Indexes in my table... mysql> select COUNT(DISTINCT id) from [tablename] where [columname] >=3; ...
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1answer
145 views

Relaying changes to a slave from another master with Tungsten on MySQL

I am trying to setup a multi-master type of replication with each master having an additional slave using Tungsten. As an example, lets say I have 4 hosts (A,B,C,D) and hosts A and C are the masters, ...
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2k views

Mysql datatype for username of maximum 15 characters

I currently have a database with the "user" table having username as one of the columns. I allow a maximum of 15 characters for the username in my system... Is it fine to have the username column as ...
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29 views

How to test mysql for changes

I'm OCD person, I think I accidentally dropped something in my mysql. Problem is I've around 50 databases, and I cannot manually check everything :( Is there a way to check for these kind of ...
2
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1answer
2k views

Extract MySQL information from a compressed tar.gz file

I have a back up-of a MySQL database which is contained in a .tar.gz file - I need to restore it. I've never had to do this before. The only way I can access the database is through phpmyadmin. There ...
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2answers
23 views

Error: This version of MariaDB doesn't yet support 'multiple triggers with the same action time and event for one table

I'm trying to run this query in mysql Ver 15.1 Distrib 5.5.44-MariaDB, for Linux (x86_64) using readline 5.1 but got this error all the time: CREATE TRIGGER trig_companies_table_insert BEFORE INSERT ...
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934 views

How to configure my.cnf for Mysql 5.1, which is using too much CPU?

I am new Database engineer. I am having trouble in my server which is using too much CPU on database query(simple count statement). I have googled about it, so i found out it depends on system ...
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1answer
19 views

How to Upgrade Master Slave MySQL on AWS RDS?

I already have Master Slave configuration on AWS RDS. We want to upgrade 5.5 to 5.6.23. ..What should be correct sequence to Upgrade ? 1. Upgrade Master ( Using Modify Instance ) --> Upgrade Slave 2. ...
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vtiger: can't login with newly created user [on hold]

When I create a new user in the 'Manage users' users section, and after trying to login with his details I get the following in log: Tue Jun 30 16:05:04 2015,666 [8555] INFO VT - PearDatabase ...
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1answer
54 views

mysql query choosing an incorrect execution plan

I have a primary with an dependant subquery as a where condition that is choosing a wrong execution plan, and therefore is running for ever. Main query: SELECT rtr.id AS id156_, ...
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1answer
28 views

How to become MySQL trainer? [on hold]

I'm a certified MySQL developer and I have over a decade of SQL experience, most of it MySQL. What are the steps to take to became a MySQL trainer? Edited to add: Sample questions that made me ...
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2answers
4k views

What is faster, one big query or many small queries?

I have been working for different companies, and I have noticed that some of them prefer to have views that will join a table with all its "relatives". But then on the application some times, we only ...
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116 views

increasing disk space for mysql data volume

I have a master mysql server which has approached 80% of the available disk space. Total disk space size is 200GB. Though, it's not an immediate concern but I have to deal with at some point soon. the ...
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1answer
38 views

Why does MySQLTuner only see 4Gb of RAM?

I ran MySQLTuner to verify the configuration of a MySQL database, and it reported this problem: [!!] Maximum possible memory usage: 40.9G (1022% of installed RAM) These figures come from computing ...
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1answer
180 views

Relation between multiple hierarchical taxonomies linked to a single entity

I am working on an online test application which supports multiple choice questions. I have created schema for taxonomy (classification) system to be used with questions. taxonomy(id, name, slug, ...
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Can data be replicated from a slave MySQL back to a master without the slave containing all the master data?

We have a PHP/Symfony 2 application using MySql as the database. The database contains a large amount of data. The application is deployed to a separate server(s) and an empty/clean version of the ...
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29 views

What are the dangers of not gracefully shutting down mysql server

What are the dangers of not shutting down a windows MySql server gracefully (i.e. hitting the reset switch on the server as apposed to shutting the OS down) ?
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Restore InnoDB to different machine

It was pointed to me from serverfault that the following question would be a better fit here so this is basically my original question from there. I currently have backups that were taken with ...
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4answers
68 views

SQL retrieve last elements of table using group by like behaviour

I am trying without success to retrieve the last version of all articles in a table. The table structure: CREATE TABLE `journalarticle` ( `uuid_` varchar(75) DEFAULT NULL, `articleId` ...
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1answer
1k views

MySQL Workbench Cannot start SSH tunnel manager

I don't know why this error is happening when I try to connect by MySQL Workbench. Cannot start SSH tunnel manager. I'm using slackware 14.1 and installed all dependencies. I already installed the ...
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3answers
152 views

INSERT/UPDATE in same query from previous SELECT with some singularities

I'm trying to perform a INSERT|UPDATE by selecting data from another DB and this is what I have so far: INSERT INTO pdone.reps (veeva_rep_id,display_name,username,`first`,`last`,email) SELECT ...
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1answer
16 views

Old Data on SFTP [on hold]

There are several old files on an sftp of mine that date back to two years ago. These files are ingested into a MySQL database. I am wondering what to do with the old raw files. The reason I am asking ...
3
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2answers
148 views

INSERT data on MySQL to specific position based on its value (similar to ORDER BY)

I have a MySQL table with 3 columns for simplicity sake: Datename |Date |Name -------------+--------+----- 30/06/15test |30/06/15|test 30/06/15other|30/06/15|other Note: Column Datename is ...
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16 views

Preserving create_time when loading a mysqldump file [duplicate]

I want to make a copy of a MySQL database but preserve the information_schema.create_time for each of the tables. I haven't been able to find an option to do that with mysqldump.
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Connection to a MySQL server fails after server restart

Until this morning I could connect via Sequel Pro to one of our networked machines that has the MySQL server on it. Today, however, it's another story: when I am trying to connect, it times out. Even ...
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2answers
24 views

How do I connect to mysql without having to type an empty password?

I just installed MySQL, and by default the root user has no password. If I connect with this command: mysql --port=3307 --host=127.0.0.1 -uroot -p It asks me to enter a password, I just hit return, ...
2
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1answer
170 views

Generic Trigger on MYSQL to replicate data on other table

I'm currently doing a history table that basically logs every single modification in a history table, and adding the Action executed. CREATE TABLE `competencies` ( `id` int(11) NOT NULL ...
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MySQL Freezes System Preferences then crashes mac

Ive installed MySQL Server on my Mac mini but when I try get to the preferences panel through the system preferences I get an alert saying: system preferences quit unexpectedly. Then the machine ...
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Syntax error when creating SCHEMABINDING view

I am trying to implement full text search in laravel 4, with mysql database. To implement full text search I need to create indexed view. When I am trying to create view with schemabinding i am ...
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1answer
844 views

add column without metadata lock in mysql 5.6

I am using MySQL Server version: 5.6.15 Homebrew. I need to add new null column. alter table requires no metadata lock. In order to avoid this MySQL 5.6 introduced algorithm=inplace. Here is the ...
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38 views

Disable Primary Key on MyISAM Table

I wanted to speed up a large insert bulk by disabling keys. So I ran the following command on a MyISAM table: alter table my_table disable keys; When I execute show index from answer_2011, I see a ...
0
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1answer
66 views

Give privilege to new created databases in MySQL

I have user "U" who I want to give him full access to all the existing databases except "db1". I want him to only have select privilege for that db. What I did is I gave "U" all permissions for each ...
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31 views

Performance impact of adding a foreign key to a 1M rows table

I have an ecommerce database running MariaDB + InnoDB, which has a table to store the transactions (T) and another which stores quotes (Q). I'd like to make a connection between T and Q by adding a ...
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Computing View Table based on rows of other tables [duplicate]

I want to compute a specific view, but I think it will be more clear if I show an example: Given this one view: | Group | User | Type | Quantity | |-------|------|------|----------| | 1 | 13 | ...
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3answers
268 views

How to duplicate related rows

Tables: Payments with auto-increment ID and one-to-many relationship to Projects such that one payment (say £10) has two records in Projects allocating the £10 between the projects. Now next month, ...
2
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1answer
128 views

Does the order of a mysql multi-column MySQL index matter - if you're always using all columns in the query?

I'm aware that when you define a MySQL index that the order of the fields matters if the query is only using part of the index, as described here. But if your query is always going to use all columns ...
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2answers
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Why would increase in innodb_buffer_pool_size slow down MySQL?

5.1.68-cll - MySQL Community Server on CentOS The system has 32GB of RAM. I increased innodb_buffer_pool_size from 10240M to 15360M (10GB -> 15GB). Time taken for a series of identical operations ...
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2answers
23 views

Is it possible to backup stored routines and functions with Innobackupex?

I am running a few restore tests on my Dev and I've noticed that the stored routines are not being restored with the innobackupx. Is that something achievable ? Am I doing something wrong ? I am only ...
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192 views

Duplicate Relationships in Rails/MySQL Healthcare Application

Overview of the Application I am building a Ruby on Rails application to organize medications, using MySQL. The goal of this application is to provide dosage specific treatment recommendations, and ...
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31 views

No connection could be made because the target machine actively refused it. MYSQL work bench?

I have created php and Mysql site.Its Working Locally Xampp well. Finally I moved My site to server..i have Used Mysql Workbench. connected client database in Mysql Workbench in My system.when I Run ...
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1answer
4k views

how to sync local mysql database and live server database?

My plan is to store data in my local MySQL database and after a time interval it will update my live MySQL database remotely. Is it possible? I'm planing a inventory management script in PHP MySQL. ...