MySQL : Open-Source, Relational Database Management System

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2
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4answers
214 views

MySql Database solution for specific web app problem

Well, I need to create a comment system for posts that people add to my web app. This web app is just like facebook or myspace posts. Users add posts and people can comment on them. But the problem is ...
2
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0answers
281 views

How to seperate sensitive data in database(MySql) [closed]

I need to design a database that will contains information about personal disease of users. What can be the approach in order to implement the columns of the DB's tables: encrypt the information, ...
2
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2answers
2k views

One query two MySQL servers

I have two MySQL servers on different server computers. Is it possible to execute single query like this: INSERT INTO database1.xxxxx SELECT table1.field1, table2.field1 FROM database2.xxxxx INNER ...
2
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1answer
683 views

How to speed up audit trigger?

The task: write a trigger to log all updates within tbl1 table for future audit users' actions. The tbl1 table: id INT(11) y SMALLINT(6) country SMALLINT(6) -- really here ~20 fields but only some ...
2
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0answers
533 views

mysql pre-start process (23901) terminated with status 1 [closed]

I installed a new Mysql server version 5.1 on machine which was running on 5.0. Now when I try to start the mysql server using command service mysql start it gives me an error start: Job failed to ...
2
votes
1answer
777 views

How to use the 'select benchmark' command on a procedure

I am trying to check which of my procedures is slowest and thus needs optimization. I currently have around 160 procedures and about 30 functions. I am using the select benchmark() to check the ...
2
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0answers
248 views

why is MySQL 5.1 on ubuntu 10.10 not starting? [closed]

I just installed a MySQL 5.1 server on Ubuntu machine. after installation the server should automatically start but it does not start and gives me an error start: Job failed to start . Even when I ...
2
votes
3answers
14k views

How to initiate MySQL on Mac OS X 10.6.8?

I followed this tutorial to install MySQL on Mac OS X 10.6.8. Now I get he following errors: $ mysqladmin version /usr/local/mysql/bin/mysqladmin: connect to server at 'localhost' failed error: ...
2
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1answer
125 views

MySQL switch between data directories for individual databases

I'm in the middle of designing a solution to an issue we're currently experiencing while writing to certain large MyISAM tables. The database in question basically stores information regarding two ...
2
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1answer
187 views

Entries disappeared, auto_increment also reversed, web app security vulnerability or DB Error?

I am using Mediatemple's Grid Hosting (GS) platform to host a wordpress site. The DB tables are using the MyISAM engine. I had noticed that a previous article had disappeared from the site. At first ...
2
votes
2answers
632 views

MyISAM table keeps crashing. What are my options?

My MYSQL table is very large (250GB, around 200M rows). Recently I've been putting it through a lot -- parallel processes that do a large number of reads. It has started locking and crashing with ...
2
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1answer
2k views

importing myisam 5.0 database into a 5.5 innodb server

I have MySQL 5.0 and 5.5 servers (but not a 5.1 server). The 5.0 server is myisam only, the 5.5 default is innodb. I need to move a database from the 5.0 server to the 5.5 server. The database is ...
2
votes
1answer
901 views

MySQL Tuner OPTIMIZE and Defragmentation

I have just started using mysqltuner to help keep my mysql server fast and healthy. However, I am having a little trouble optimizing my tables. When I execute mysqltuner, it all works fine and returns ...
2
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0answers
111 views

MySQL MEMORY table has high Lock Wait Ratio [duplicate]

Possible Duplicate: Mysql Memory table getting many locks on my site I log every pageview (date,ip,referrer,page,etc) in a simple mysql table. This table gets very little selects (3 per ...
2
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2answers
5k views

Does MySQL support replicating all databases?

I’ve been doing some investigation into properly configuring MySQL replication. From what I understand after reading the documentation, you can only replicate specific databases, and each database ...
2
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2answers
753 views

MySQL Workbench Loses Saved Connections

I've been using MySQL Workbench as my go-to management application for quite some time. However, recently (namely, in my most recent install), it will every so often lose the saved connections I've ...
2
votes
1answer
169 views

poor and/or unreliable InnoDB performance

I recognize that there are a ton of posts like this, but after reading up on InnoDB performance problems, nothing I tried has helped. I have a database containing four InnoDB tables. The largest ...
2
votes
4answers
800 views

Getting 0KB of size file while backup mysql database using mysql dump [closed]

I am using below code to backup my database using php script but I am getting 0KB size file. How can I backup my full database with all routines and functions? $dbhost = 'localhost'; $dbuser = ...
2
votes
4answers
493 views

MySQL: Keep the 10 most recent rows for each user

I have a table saving scores for a game that have 3 columns (more in practice, but it is easier for everyone this way): userid : the id of the user that got the score timestamp: the time the score ...
2
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2answers
1k views

ERROR 1166 (42000) at line 65203: Incorrect column name ''

I have a big snapshot database size is about 44GB in mydata.sql. When I run it overnight, it show this error message: $ mysql -u root < mydata.sql ERROR 1166 (42000) at line 65203: Incorrect ...
2
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3answers
6k views

Avoiding “Waiting for table metadata lock” when `ALTER TABLE DROP PARTITION`?

I have some tables that many users need to access to: mysql> show create table v3_cam_date\G *************************** 1. row *************************** Table: v3_cam_date Create Table: ...
2
votes
2answers
336 views

Can I use a foreign key index as a shortcut to getting a row count in an INNODB table?

I have a table that has a large number of rows in it. The primary key (an auto-incrementing integer) is, by default, indexed. While waiting for a row count to be returned I did an EXPLAIN in another ...
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2answers
2k views

MySQL COUNT Query taking too long time to execute

I have below query that takes 7 secs to run SELECT COUNT(*) AS `count` FROM `yuldi`.`businesses` AS `Business` LEFT JOIN `yuldi`.`businesses_categories` AS `BusinessesCategory` ON ...
2
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1answer
3k views

mysql taking too long to send data

I have a simple table with million of records (14,000,000) and for a simple query it is spending too much time "sending data". The table CREATE TABLE IF NOT EXISTS details ( id int(11) NOT NULL, ...
2
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2answers
172 views

measure the traffic throughput on mysql table

In order to split mysql database into two different databases on different hosts. I would like to know few things: what is the size of the tables. what is the traffic throughput to those tables. ...
1
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3answers
493 views

Should I split a single table with an AUTO_INCREMENT PRIMARY KEY into two tables that can be joined on that PRIMARY KEY?

I have a table that has 46 fields with an AUTO_INCREMENT PRIMARY KEY. It's hard to look at a table that has this many columns, so I frequently use a SELECT statement to look at 34 of the fields that ...
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2answers
2k views

Datediff() in MySQL

While calculating difference between 2 dates as number days, by using MySQL Datediff() function, I am facing some issue, the SQL code is given below. select datediff((select curdate()), (select ...
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2answers
140 views

How to optimize this query?

Query: Select * from `t_event` where `create_user_id`=7 and (`event_create_date`)=('2012-12-18 00:00:00') and `event_type_cd`=11 and `domain_id` =602 and `job_id` =1 limit 1 Table structure: ...
1
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2answers
6k views

Script to show mysql health status?

Kev suggested this question ( http://stackoverflow.com/questions/10524981/php-script-to-show-mysql-health-status ) is better fitted here. I know phpMyAdmin can shows the lists of mysql vars and ...
1
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2answers
1k views

mySQL data table seems to stuck at 16777215 rows

I am creating a MySQL table and loading data from a local file. CREATE TABLE `patent` ( `seq_number` mediumint(9) unsigned NOT NULL auto_increment, `seq_id` varchar(24) default NULL, `date` ...
1
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2answers
291 views

managing a growing database in the long run (10 years from now)

I'm close to finishing-up a WEB app (PHP + mysql website portal), which will start slowly, as in uploading few pictures and inserting few rows in main database table, but soon, and over few years, I ...
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3answers
1k views

Swap Columns on some rows?

I have a table of about 106k rows where about 11k rows have the values in 2 columns swapped. I want to run a query to fix it, but I don't think I can do this: UPDATE `game` SET ...
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2answers
837 views

Commercial database systems versus open source database systems [closed]

Can anyone tell me what are the reasons for buying a commercial database system and not using an open-source free version? The reason for my question is that: Commercial systems cost upwards of ...
1
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2answers
3k views

mysql: using comma-separated values

I have a simple mysql table which I use as a server booking system. A user can log in to a server, if he has a valid booking for that server. A sample data might look like this: ...
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4answers
9k views

Recursive self joins

I have a comments table, which can be simplified down to this: comments ======= id user_id text parent_id where parent_id is nullable, but might be a key for its parent comment. Now, how can I ...
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4answers
791 views

Unsure how to implement certain constraints and relations in this relational database schema

I am in the middle of designing the dB for school project- airline ticketing database.(Using MySQL workbench) So far, I came up with the following design: Here are couple things I can't figure out: ...
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2answers
2k views

MySQL case sensitivity for table names

Why is it that different platforms (linux vs windows) does not support the same naming conventions? I'm stunned by the fact that the documentation uses file names as an excuse for this. Yes, windows ...
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2answers
135 views

Can't create table with this script

Trying to create a table with the script below. Every time I execute it I get the following error and can't work out why?! #1064 - You have an error in your SQL syntax; check the manual that ...
1
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2answers
541 views

MYSQL only Show columns which allow null

I need to be able to pull the column names which allow a NULL value, I know that show columns from TABLE Will give show me the table properties and whether or not the column allows null values, ...
1
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1answer
4k views

Invalid default value for DateTime when changing to utf8_general_ci

I'm trying to run a script to modify a database, this query ALTER TABLE cmContentVersion CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; gives this error ERROR 1067 (42000) at line 68: ...
1
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2answers
268 views

MySQL for Administrators course from Oracle: worth it?

This is a question probably experienced MySQL admins can answer, but is not really a technology question. I am looking into MySQL Administraton course from Oracle/MySQL AB. It seems interesting as ...
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3answers
206 views

Deleting data from a large table with replication

I need to delete all the rows from a given table. The table contains millions or records. The master database is being replicated to several slaves and I wish to do that without creating a replication ...
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2answers
327 views

Messaging Database - How to handle multiple recipients

So I am trying to develop a relational database (I'm using MySQL, planning on a Java front end) where I have 3 tables (People, where I store names and relevant personal information... and Messages ...
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5answers
1k views

How to determine why a MySQL server has become slow and requests sometimes time out?

I'm working on my first project that makes heavy use of a MySQL database and am struggling to understand performance issues I'm having. Most of the time, responses are returned quickly from the ...
1
vote
1answer
390 views

What happens to a transaction if the network connection fails?

What happens to a transaction when the client connection is lost. Example the client is a web application code that starts a transaction to a remote server instance. The client sends the sql code to ...
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4answers
698 views

Pick one single row each time from either table?

I will run a query and get a list of aID and based on that I will try to match below tables.For each aID I just want one record either from tblGAlert or tblEAlert based on gDateTime and eDateTime ...
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4answers
2k views

Daily and Differential Backups [closed]

Is there a program with which I can create daily MySQL, PostgreSQL and MariaDB backups with these requirements: The first time, make a full backup. The second time, only the changes since the last ...
1
vote
1answer
11k views

Performance difference between MySQL and PostgreSQL for the same schema/queries [closed]

I'm a newbie DBA, and I have experience in Microsoft SQL Server but I want to jump to FLOSS. I'm starting a company, and we develop an app (PHP) with a Postgres backend, and we did some tests ...
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3answers
411 views

Mysql error while creating FK

here is structure of both tables category table CREATE TABLE category ( `catID` bigint(20) NOT NULL AUTO_INCREMENT, `title` varchar(60) NOT NULL, `created_at` timestamp NOT NULL DEFAULT ...
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2answers
856 views

SQL Partioning on date, how does it work for future records?

I am setting up a new system and I would like to partition the data for speed. Basically what I would like to do is have one database with all the latest information (e.g. last 3 months). then have ...