MySQL : Open-Source, Relational Database Management System

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From freelancer to team of two : best way to share/sync db?

I am a webdev. I have just hired a dev. Before that I was alone. Thus, I have to change a bit my organization. I am looking for the best way to develop on the same database (mysql). I am considering ...
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1answer
40 views

MyISAM : Should I be concerned by these warnings?

I restored some tables from recent Databases backups. Because Im supporting a legacy system that only uses MyISAM tables in their DBs, for backing up I used a little script that pretty much copies all ...
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8 views

How can I decrease FULLTEXT initialization time?

I'm trying to decrease execution time of the a query. Using SHOW PROFILE, FULLTEXT initialization takes about 0.3, which is too high. Other values are at normal level. How can I decrease FULLTEXT ...
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27 views

How can I normalize and optimize this database before I build it?

I was just given the project of creating a database to store and access information that the various engineers involved in design and manufacturing can use to create updated instructions and load ...
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28 views

MySQL fulltext selection performance

I have 1.5M rows in a table. Following is the table create code: CREATE TABLE `jobs` ( `id` INT(8) NOT NULL AUTO_INCREMENT, `job_id` VARCHAR(50) NOT NULL DEFAULT '', `title` VARCHAR(255) ...
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15 views

Get tp.address_from and tp.address_to from travel_point table

I'm building a view for get tp.address_from and tp.address_to but I can't get this works. This is the query I'm working on: SELECT `tp`.`address_from` AS `address_from`, `tp`.`address_to` AS ...
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1answer
22 views

Duplicate Entry Error with PHP When Trying UPDATE

I am checking if a record exists, creating a new record if it does not already exist, and updating otherwise. The SQL works fine in PHPMyAdmin but not through the PHP page. $check_for_id = ...
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1answer
20 views

MySQL read/write ratio from information_schema.GLOBAL_STATUS

Could you please help me to construct a query to sum specific rows from a table, basically desired output is: +-----------------+----------------+ | Total reads | Total writes | ...
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1answer
17 views

Extracting the maximum of several subsets and join all maximums in a new table

I have a big table: What I need is to obtain the maximum value for each testname, with different entry and get a new table such as: And then I want to compute the maximum, the minimum and the ...
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1answer
25 views

Why is my Mysql Query verry slow when selecting a text field

i have a problem with a left join. Tables are myisam. Tables CREATE TABLE `article` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `force_startpage` tinyint(1) DEFAULT '0', `title` varchar(255) ...
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1answer
24 views

How to find n consecutive numbers in MySql

I have numbers starting from 1 to 50 and then 90 to 200 in my database and I want to fetch 100 consecutive numbers then the result should be 90 to 189. Records in my table are more than 10 million.
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2answers
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MYSQL 5.5 Fail start Fedora 16

I installed mysql and mysql-server from the repos (MySQL version 5.5). Then tried to start it, but got an error. [root@server]# service mysqld start Redirecting to /bin/systemctl start ...
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1answer
15 views

pt-table-sync for 3 master servers

We had a mysql multi master with 3 nodes and unfortunately the replication broke. We have some set of tables which has to be in sync with other database servers, so i was looking into Percona-Toolkit ...
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2answers
157 views

How to optimize a log process in MySQL?

In my project, I have about 100.000 users and can't control their behavior. Now, what I would like to do is log their activity in a certain task. Every activity, is one record which includes columns ...
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0answers
22 views

amazon small instance mysql query too slow

I have mysql database with 1.5 millions records with 2 million categories records. when i do query on categories and city where clause it takes 304989 milliseconds. on localhost it too fast. i tried ...
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1answer
17 views

MySQL crashes frequently on a Windows server

I have been facing an issue with MySQL crashes since last week. I don't know what exactly is happening. When I look at the Windows logs, I see the following error message: Faulting application name: ...
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2answers
65 views

Reset of root password not working?

Our previous DBA left and didn't note the root password down, and I've been pressganged into doing part of his job until we can hire someone. So I create a file : /root/mysql.password Inside that ...
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1answer
24 views

Query to join three tables

I have three tables which I have to join. I'm not a good SQL writer. Can please sombody help me to prepare this using joins: branches ----------------------------------------- branch_id | branch_name ...
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1answer
132 views

How do I access a result set from a StoredProcedure… in another StoredProcedure

I have a non-trivial SELECT statement and I don't want to write it twice (standard SW development considerations). I want to use the results in two stored procedures. I am imagining something like ...
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0answers
17 views

MySQL Dump failure in the middle

I have a several GB's of MySQL datas,I want to dump those files,As when I tried to dump,it fails in between. It is impossible to start over the process again,Is there any way to start the dump from ...
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0answers
15 views

Randomizing the Auto Increment in Mysql

We have a database, where we insert data into table whenever we receive an order from our services. We use auto_increment to generate the ID and assign the order with the same. This is usually same ...
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2answers
49 views

JOIN on three tables is not working

I have these three tables, user, categories and files In users, table I have a column user_id And I have this query that shows all Categories. SELECT `categories`.`category_id`, ...
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1answer
29 views

Indexes involved in intervals collision detection

Let's assume an hotel booking application wants to display all customers being present between two dates. Starting with a venue table : CREATE TABLE `venue` ( `id` INT NOT NULL AUTO_INCREMENT ...
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2answers
80 views

Altering table Foreign Keys produces an error (errno:150) (MySQL)

This is the first database I set up so I apologize if my problem is something obvious. I'm playing around with my table design and tried to create some link tables with FKs to avoid redundant data. ...
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18 views

DBD::mysql complains “Character set 'latin1' is not a compiled character set”

I think this boils down to "Am I doomed to upgrading mysql hoping the problem goes away?". I've seen a few of the same issues around the internet but with no guidance on a fix other than "Did you turn ...
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1answer
20 views

MySQL: update field with “x hours xx minutes”using int from another field

We have two fields that hold time data totalTime (int): number of minutes (eg 243) totalTimeDesc (string): normal english representation (eg '4 Hours 3 Minutes') We have a lot of different formats ...
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2answers
72 views

Find problematic MySQL users and databases

We have a MySQL 5.1 server that is an "open" service: anyone on campus can request a database. As such, we have several thousand databases on this one server. As you might imagine, sometimes one ...
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1answer
31 views

Last row from a query without Order by

I have something like SELECT var1,var2 FROM table where var3=X AND var4=Y order by var5 desc limit 1; Running this query takes roughly 5 seconds on my database which is far to slow. I was ...
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1answer
14 views

Can triggers be used to implement automated polymorphic association?

(Apologies for any bad formatting or ignorance of common practices within this community; this is my first question here.) I'm attempting to (re)design a MySQL database for a personal social ...
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1answer
91 views

slow writes on percona / mariadb 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 ...
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1answer
14 views

MySQL/PHP Returning Blank Error Message

I am using the following code to delete a record. It works fine, but MySQL always returns a blank error message. PHP returns "Error: " instead of "1 Record Dropped". $eventid = ...
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1answer
17 views

Where mysql writes its log seqeunce numbers and last checkpoint at?

I'm working on developing mysql log collecting system. To do that, I have to collect log sequence numbers from mysql LSN and last checkpoint location. But I have no idea where should Which log file ...
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2answers
32 views

How do I allow remote mysql access to all users?

I have setup a mysql server on unbuntu. The server hosts websites for my various clients. Hence, I want all of them(and any new clients) to have remote access to the mysql server. How do I configure ...
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1answer
251 views

Table is marked as crashed and should be repaired

I have MySQL and Nagios installed Linux PC (Centos5.5) I have wrote some script to fetch the data from Nagios to Mysql DB (Exactly fetch data in Table) The data fetching working properly (confirmed ...
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1answer
52 views

MHA configuration problem with MariaDB10

I am using MHA (MySQL Master High Availability) over a MySQL/MariaDB master-slaves pool. Here is my setup : master1(10.0.0.1:3306) (current master) MySQL 5.1 (log-bin:enabled) ...
2
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1answer
2k views

MariaDB and XtraDB/InnoDB plugins

In my vps, I thought of switching from MySQL to MariaDB (using Monty's repository for Debian Squeeze). Copying over my.cnf from MySQL to MariaDB, I saw that the new config file (the one from the ...
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0answers
16 views

Why does Amazon RDS memory utilization drop and disk space utilization rises?

I encountered a problem with my Amazon RDS(db.m2.2xlarge) where DB connections spiked up and my website started responding slowly. On looking up the metrics I was not sure why my freeable memory shot ...
2
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1answer
53 views

mysqldump --single-transaction, yet update queries are waiting for the backup

If I use mysqldump --single-transaction, according to the docs it should do flush tables with read lock to get a consistent state and then start a transaction and no writers should be waiting. ...
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0answers
30 views

“Bad SubDomain SQL query” [on hold]

My website shows "Bad Sub Domain SOL query" when i open the site.It's an E-commerce site, platform is PrestaShop(Version: 1.5.5.0) and it worked well in the last 2 years. Now it shows "Bad Sub Domain ...
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1answer
25 views

mysqldump drop create use case sensitivity

Dumped sql from MySQL is showing inconsistencies in the name of the database. Using the following bog standard method to dump a database: mysqldump --add-drop-database -u someuser --databases ...
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2answers
259 views

Import CSV file into Mysql with Multiple Delimiters/Field Separators

I'm trying to import a large csv file into Mysql. Unfortunately, the data within the file is separated both by spaces and tabs. As a result, whenever I load the data into my table, I end up with ...
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2answers
32 views

query execution time in mysql

I have run the query in mysql which consists of approximately 33million records when i have executed the query select population1 < 200000 from city; it shows like this after execution ...
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1answer
259 views

Mysql compatibility between client and server of different versions

How to know what version of mysql client is compatible with what version of the server? Is there backward or forward compatibility tables from the client and/or server point of view? For a given ...
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2answers
80 views

why does mysql query running slower on server?

select glpi_tracking.id AS gi, glpi_tracking.date AS gdate, glpi_tracking.closedate AS cdate, glpi_tracking.contents AS gc, glpi_followups.tracking AS gft, glpi_followups.date ...
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2answers
39 views

MySQL Code Works in PHPMyAdmin but not in PHP Page

When I run this query in PHPMyAdmin it works fine, but when I run it from the PHP page using the $sql command, I get the error: "You have an error in your SQL syntax.....near ')' at line 2" $sql = ...
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0answers
12 views

What are the advantages and disadvantages of Sequel Pro over writing on my terminal? [on hold]

I am starting to use MySQL (I am actually learning). What are the advantages and disadvantages of Sequel Pro over writing on my terminal? Where can I find a good quick tutorial to use those advantages ...
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2answers
1k views

Replication on MySQL server

I had to stop the slave server to test something. After I started the server again there is a problem with replication on MySQL server On the problematic server mysql> SHOW SLAVE STATUS\G ...
2
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1answer
30 views

Auto-increment ids with multiple inserts in mysql/mariadb

Suppose I have a table with an auto_increment column, and then insert multiple values in a single statement: insert into foo (bar) values ('a'), ('b'), ('c'); From the documentation, ...
3
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2answers
5k views

How do I fix the definer problem The user specified as a definer ('fred'@'192.168.0.%') does not exist

I dumped an existing database from my web site into a new MySQL setup on my laptop. Everything works except pages that use a view, when the error message above appears. There is only one view on the ...
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1answer
31 views

Gets records by max date and hour

I have this query: "SELECT * FROM `" . $table . "` WHERE STR_TO_DATE(data, '%d/%m/%Y')=(SELECT max(STR_TO_DATE(data, '%d/%m/%Y')) FROM " . $table . ") AND hour=(SELECT MAX(hour)-".$delta_hour." ...