MySQL : Open-Source, Relational Database Management System

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Is online schema change possible with MySQL Cluster?

I believe that this is the first question on this community. I'm surveying MySQL Cluster for next project in my workplace. I read a lot official/unofficial pages on the web. But I'm not a native ...
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54 views

Mysql sum of column group by question

I have the results of a select that I am joining on that I need to get a slightly complex sum of a column from. I need the sum of result grouped on id PLUS the sum of result of any row where ...
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38 views

MySQL Fabric Error- No module named mysql.fabric.services

I have installed MySQL fabric, but I am getting this error $mysqlfabric Traceback (most recent call last): File "/usr/bin/mysqlfabric", line 27, in <module> from mysql.fabric.services ...
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19 views

Computer crash causes MySQL to leaves behind an .err file that stops mysql from booting on reboot

When my mac crashes it leaves behind an error file that I have to manually delete or MySQL won't start again. (fx1)kit:fx1 kitsunde$ ls -l /usr/local/mysql/data/kit.err -rw-rw---- 1 _mysql wheel ...
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61 views

MYSQL : Copying to TMP table nightmare

I'm having a (AFAIK) random issue. My server is MySQL and I have a query that is sometimes 10000 times slower as you can see on this screensot : http://snag.gy/vJJ39.jpg The long time occurs during 2 ...
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281 views

MySQL Binlog Dump process stops after net_write_timeout

We have 2 MySQL 5.6.19-1 servers with master-master replication that were working fine (DB01 and DB02). One of them was rebooted unexpectedly (DB01) and seemed to be working fine, but we saw that the ...
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163 views

Table user, role, and function MySQL database design

I'm new in designing databases. At first I have made a relationship of tables users, roles, and functions. This was my database design: Then I want a level of roles or kind of grouping roles for ...
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20 views

mysql replication error 1236 need to restart replication process

I'm using mysql replication and the slave/master crashed in the process and then I got: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in ...
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27 views

Best Query/Method to Import A Database Via Workbench and Push Edits Back Out to Prod

I have a local instance of Workbench. It connects to a local dev database, and also a remote prod database via SSH. I want to be able to work on my dev database and push the changes out to the prod ...
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240 views

Connection to Amazon RDS MySQL instance fails with `init_connect command failed`

I'm attempting to open a connection from my Amazon RDS instance to my local dev machine. I added my IP to the security policy in Amazon's panel (read: whitelisted myself in the firewall) and added my ...
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71 views

is there any limit of MySQL status variable value?

As we know MySQL status variable is a counter variable since the service start. MySQL service in my DB server restart every week (on sunday). Below is my observation since last few week: Suddenly ...
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294 views

Create separate temporary table/view and variables for every query

How can I create something similar to VIEW or TEMPORARY TABLE for every query separately? I have 1 process, it creates and holds one connection (doesn't destroy connection after request, so doesn't ...
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28 views

Two types of rows with mutual fields and unique fields

I have a question about DB design. (MySQL) In my website, users can leave reviews for Stores and Products. Right now, there's a table for stores and a table for products. Each item ('item' = either ...
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18 views

Setting the Relationship as a Continuous Line Without Changing the Qty INT into Primery Key on SQL

Now it is required to make the following database. In the following, if I tick the checkbox of "Identifying Relationship", the line will become continuous line but the key type will also be ...
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35 views

mysql advanced query

I'm sorry for my English. I have a problem with db mysql. I have a table like this id|rat|time 1 |2 |12:00 2 |0 |12:55 3 |0 |13:05 4 |6 |13:45 5 |0 |14:00 6 |8 |15:00 7 |0 |16:30 8 |9 |17:00 ...
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47 views

How to handle too many instances of multiple tables?

If there is a table accessed by multiple DB threads ( for example 100) at a time then how many instances of that table will be opened? If I run show open tables and see that in_use column value of a ...
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159 views

MySQL check if user has the required privileges before execute CREATE query

I'm working on a get started wizard in my application, and I've come to the part where the user needs to create tables in order to proceed. That can be done in two ways; either copy/paste the provided ...
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36 views

Uninstalling phpMyAdmin after deleting associated MySQL Database

I'm new to MySQL and phpMyAdmin so please forgive me if this is a stupid question. This morning I created a MySQL database and user on my web server. I then installed phpMyAdmin onto this database. I ...
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73 views

MySQL Enterprise Monitor - Query Analyzer configuration problem

I'm using MySQL 5.1.69. protocol_version 10 version 5.1.69-log version_compile_os redhat-linux-gnu I have a problem with configuration/using MySQL ENTERPRISE MONITOR. I don't see data in ...
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32 views

Merge colums from two different databases using phpMyAdmin

Is there a way to: Replace all the data from database1 > table1 > column2 With Data from Database2 > table1 > column2 ONLY under the condition that the ID value in database1 > table1 > column1 ...
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70 views

MySQL moving large data from one schema to another

Good day, I have a DB schema that has a single table that grows about 30 million rows per week, or about 25GB. Every day we hit our limit of the data that can stay there so we move the data on to ...
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155 views

MySQL: What should I do if too many tables opened during peak hours?

In Peak hours: When I run below statement, I found around 100 tables out of 250 have opened. show open tables where in_use>0; There are around 10 tables for which in_use value are >50. Storage ...
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21 views

Handle a Search on 2 Big Tables

Hello i want to realize a exchange system with 2 tables. 1 Table for "the user is looking for" 1 Table for "the user has to share" the Tables are very simple id bigint user_id bigint object_id ...
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634 views

MySQL 5.6: explicit_defaults_for_timestamp

I have the following replication topology: DB1 (MySQL 5.5) -> DB2 (MySQL 5.6, explicit_defaults_for_timestamp = 1) -> DB3 (MySQL 5.6, explicit_defaults_for_timestamp = 1) - "date" field: ...
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80 views

connecting Pervasive PSQL and MYSQL

I have Peachtree/Sage 50 on the server and trying to sync/integrate with MySQL, I already created a ODBC datasource but how can import all tables in sage to MySQL. What im trying to accomplish is to ...
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83 views

innodb fulltext Table handler out of memory

I am running mariadb 10 and have a large innodb table with a fulltext index. When searching I am regularly getting this error ERROR 128 (HY000): Table handler out of memory Is there some way I ...
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58 views

MYSQL Tables Join Filtering For Favorites

I am in need of some help figuring out the best way to join separate tables I am using. I am essentially trying to output a list of schools (first table in MYSQL) where one column is an empty star ...
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55 views

3TB limit in MySQL NDB engine

The NDB documentation comparing NDB and InnoDB states that NDB has a 3TB limit, but it implies that it is not a hard limit, and is hardware or performance expectation dependent: (Practical upper ...
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74 views

How to pass ouput parameter values in mysql procedure

I am new with mysql and i getting issues at time of using output parameters in mysql procedure. Scenario: I have two tables MyProcedure code: DELIMITER $$ CREATE ...
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63 views

MySQL Crash (mysqld)

I decided myself to add space to one section. Booted from LiveCd, launched gparted, pitched wrong. After rebooting fell lilo, but to this I was ready and fixed the problem, but what was not ready, so ...
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39 views

Restoring Magento MySQL db to

We are moving a Magento site to a new server. When restoring the database, it terminates with error message: ERROR 1064 (42000) at line 11953: You have an error in your SQL syntax; check the ...
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572 views

How to split task (read and write) between two mysql server via HAproxy load balancing?

I have done some test and setup two (A and B) different database server from the following link - https://www.digitalocean.com/community/tutorials/how-to-use-haproxy-to-set-up-mysql-load-balancing--3 ...
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39 views

MySQL Replication problem with VIEWS and “Sub-Databases”

I've got three servers that should do a master-master replication. On server 1 i got "01_maindb" which holds the master tables. I replicate this table to the two other servers without problems. ...
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31 views

period causes results to not display

I have, as an example, the following in a mysql database table: (28,'man vs. wild','discovery',1) Info on my db: mysql 5.5.37 InnoDB utf8_unicode_ci fulltext When I do a search such as this, I ...
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55 views

Need to show Row Data in The form of Column using MYSQL?

need to show the renewl_year data in the form of column like MEM_Code renewl year 2003 renewl year 2004 renewl year 2005 Paid_amount sum using query:
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102 views

error add new data node to mysql cluster

i'm deploying MySQL Cluster and i have prolem when i want add a new data node to cluster, i follow this link enter link description here , but i get error at step 5. When i run command: ndbd -c ...
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87 views

Optimal config for a small vserver with ispconfig

I have a vserver with debian wheezy, 1GHz CPU single core, 512MB RAM and only 8GB HDD. Owncloud is running, but has its own database-engine How should I configure Mysql so it doesn't slow down the ...
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68 views

MS Access using MYSQL database and error in SQL (memo, hyperlink OLE)

I have a SQL statement that works fine in MYSQL workbench but when used in Access it produces a "invalid Memo, OLE or Hyperlink Object in subquery 'custom_values.value'. SELECT ccr1.value, ...
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35 views

How to fix my SQL database

I have recently moved a WordPress blog into a new servor which has these caracteristics : debian, mysql 5.0.51a-24, 16GB of ram. The mysql crashed regularly with this log info: Feb 8 12:17:14 ...
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89 views

What is the best way to execute a MySQL script periodically on Linux

I want to execute some SQL everyday in a Linux server using MySQL to UPDATE some column's values. In order to do that I use the UPDATE ... SET ... WHERE ... statement. I want to know which is the ...
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152 views

MySQL - Pivot-style (row -> column) results in subquery

SELECT j.departure, stopDepartures.* FROM journey j JOIN journey_day ON journey_day.journey = j.id JOIN service ON service.id = j.service JOIN pattern ON j.pattern = pattern.id JOIN ( SELECT ...
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136 views

Does MySQL have a visual tool for suggesting indexes like SQL Server's “Include Actual Execution Plan”?

SQL Server has a remarkably useful feature called "Include Actual Execution Plan" which not only gives you a visual diagram of your query, but also automatically suggests indexes that can improve ...
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46 views

MySQL - Database has huge overhead but tables don't

I have some problems with two MySQL databases. The databases have huge overheads but none of the tables do. When I recreated the tables the overhead just reappeared aswell. I hope you can help me. ...
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15 views

Validate hierarchy of two tables

I have two tables in my mysql database: Questions question_id Answers answer_id parent_question_id child_question_id Basically, I'd like to pass in a question_id, and have all child ...
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50 views

SQL query to fetch results for multiple many to many relationship tables

We are developing a database for storing licensedetails of source code, archives, shareobjects, binary. We parse a detailed build and extract list of source files that make objects, list of objects ...
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116 views

Very slow response even with a high number of available connections

I'm running this server for data mining purposes. It runs several compute-intensive data mining applications in parallel and does simultaneous access to the MySQL server. Here are the ...
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114 views

MySQL hook and alter incoming INSERT queries?

We have an application running on a server which parses an xml data feed into SQL queries and executes them continually 24/7. There is a serious issue in the design of the queries and we need to ...
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105 views

store code/script value as text in database

I have the following situation: I have to work with software, developed in Java, that allows the user to input some custom scripts in order to do some calculations. so i have to store/save the ...
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50 views

Cant Normalize my dimensions and fact table, need help

I have a task at school that I can't get my head around. The task is to create some dimetables and create a facttable from those. The data I have chosen is from Export and Import cost for each year ...
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321 views

General error: 1615 Prepared statement needs to be re-prepared

I have been running into this issue every time I try and sync a medium size JSON object to my database so we can perform some reporting on it. From looking into what can cause it I have come across ...