MySQL : Open-Source, Relational Database Management System

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Binlog not consistent between slave and master

Initially I don't see binlog on slave is updating. Today I discovered and add log-slave-updates option to slave, now it is updating. However, the filename does not match between slave and master. ...
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5 views

Best Mysql Performance Booster for Large Datawarehouse

What are the most effective and efficient ways to improve the performance of mySQL DB hosting a large Datawarehouse. Please suggest the best methodologies and performance tweaks that should be there ...
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3answers
104 views

How to remove master role from MySQL server

I have 2 MySQL servers, one is the master and other one is slave, that's all good. The problem I have is that the slave is also set up as a master. I would like to disable or remove the master role ...
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351 views

How to perform ETL from RDBMS to Neo4j

I have a mature 50+ tables web application based on mySQL. In order to do some advanced data mining I want to use Neo4j and the goodnes of cypher. However I'm having a hard time migrating my data from ...
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16 views

Dynamic my sql error

I am below error when i try to execute procedure. delimiter $$ USE `Test`$$ DROP PROCEDURE IF EXISTS `DYNAMIC_MYSQL`$$ CREATE PROCEDURE DYNAMIC_MYSQL() BEGIN DECLARE DONE INT; DECLARE CHECKNUMBER ...
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2answers
120 views

How to autoincrement Prod_id based on Product_Name using trigger in mysql

Product_Details table : (Fields) Prod_id(Primary key), Product_Name, Prefix and Slno(Auto incremented) i need to increment Prod_Id based on the product name field and prefix field (Input will be ...
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18 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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1answer
201 views

Syncronize mysql databases between local and hosted servers automatically

We have many website with Development , Staging and Production Server. we have many developers for many projects, we need a solution to synchronize the database with developer database with staging ...
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2answers
59 views

Monthly report by time

I work in a parking company. We need a report of monthly vehicle exits by time. select hour(datetimeout) as 'dateout',count(*) from to_leaveveh where datetimeout between '2014-09-01' and ...
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1answer
12 views

MySQL stress test tool, remote server preferred

For MySQL stress test there exists programs: http://dev.mysql.com/doc/mysqltest/2.0/en/test-programs.html Also mysqlslap exists: http://dev.mysql.com/doc/refman/5.5/en/mysqlslap.html Is it possible ...
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1answer
14 views

Testing data integrity porting from old database to new

I've created a Web/ASP.NET/MySQL database front end & back end that gets created from the XML logs from a previous Java based XML client-server that is not serving the company very well (the XML ...
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1answer
16 views

Friendship and Messages in a MySQL table relational schema problem (concerning big data manipulation)

Before you start suggesting this question for duplicate read it, I have searched and i haven't found any proper solution. So, i'm building a social networking site (I know that you are laughing ...
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2answers
26 views

High MySQL “InnoDB Writes Per Second” - Can't see the queries?

On our live MySQL 5.5 database server, we use MySQL Workbench for running manual queries, checking running queries to see what's going on, etc. I noticed today that on the "Server Status" tab there's ...
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0answers
16 views

MySQL SUM with multiple GROUP BY on same table

What is the best way to produce several sum results based on different group by conditions on the same table in MySQL? I believe I'm doing a bad select, but I can't figure out a better way. Imagine ...
3
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1answer
25 views

is it possible to do a reverse pattern search in a database?

I have 2 database tables with rows containing strings. If I combine two strings, one from each table, as input I need to be able to find where the parts of the strings are located in each table. For ...
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1answer
17 views

How do i increase the total MyISAM indexes?

I have just made a check for my server with mysqltuner. -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB +Federated +InnoDB -ISAM -NDBCluster ...
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1answer
317 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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1answer
502 views

Why does max_connections in my.ini not match concurrent connections in Mysql instance config wizard?

MySQL 5.1.x | Windows Server 2003 Can someone please clarify why max_connections in my.ini is much larger than the manual value I specify in the Concurrent Connections Dialogue? For example, if I ...
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2answers
214 views

Upgrading to MySQL 5.6, benefits to switching to GTID replication?

We have the most basic of MySQL replication setups, a single Master doing statement-based replication to a single Slave, a 90/10 mix of innodb/myisam tables. Both run Percona MySQL 5.5 at the moment ...
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1answer
75 views

Mysql can't write to filesystem

I need to output some queries as csv files. The directory is in the webroot and I want it to be writable by apache too, so I'm trying to add mysql to the www-data group (on Ubuntu). I thought this ...
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0answers
9 views

Small startup: Cassandra + Hadoop or ElasticSearch

To give some context, I am from a small start up (4 team members) and we work in the education space. We've developed an e-learning platform that several schools are already using. We currently have ...
0
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1answer
20 views

Explain doesn't show indexed column as key

Consider the following table structure CREATE TABLE `games` ( `game_id` bigint(20) NOT NULL AUTO_INCREMENT, `players_no` tinyint(4) DEFAULT NULL, `startedon` datetime NOT NULL DEFAULT '0000-00-00 ...
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2answers
541 views

How to join two result sets from same table with different conditions on same column?

select * from unit_of_measure; +--------+-----------+--------+------------+--------------+-----------------+-------------+---------------+------------------+ | uom_id | uom_name | symbol | created_by ...
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1answer
84 views

Very slow update with subquery (different tables)

I run this query to update "domains" table based on "log" table: UPDATE domains SET domains.mx_collected = 0 WHERE domains.domain IN (SELECT log.mail as domain_name FROM log WHERE `time` >= ...
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1answer
14 views

Does the keyword NEW have the per-connection basis aspect to it?

I am watching a mysql table with an after insert trigger and i have started to receive many inserts.I am using NEW.message to get the last inserted message. Since i am receiving many inserts from ...
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1answer
45 views

Custom Collation on MySQL Unknown

I've created a new collation as per the instructions mysql. In fact this tutorial was the exact use-case I needed. I've added the collation, and restarted mysql. When I try to run ALTER TABLE ...
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2answers
208 views

Change MySQL database name in SQL file

I have a 2GB mysql backup file that has several databases in it and would like to change the name for one of the databases. What approaches can I use to tackle this issue ? I have used sed but it ...
3
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1answer
505 views

Select * from statement execute very slowly, innodb io read speed is low

I have a very simple query " select * from ap_statistic " running in my servers. the servers have the same hardware and software configuration (CPU 8 core, mem :32G, OS: redhat 5.5, mysql version: ...
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1answer
13 views

Change MAMP to use a lower Mysql 5.1 version

I need to have the same development environment for my PHP program. My clients test server is running on Mysql 5.1 while my local is using MAMP running Mysql 5.5. How do downgrade my mysql database ...
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1answer
19 views

Best practices for relating NoSQL data to RDMBS

I am looking to use both a NoSQL solution (Redis, Mongo, etc) with a mySQL/Laravel application. My reasons for this is that I need a schemaless key value storage to go with my relational data. I could ...
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1answer
15 views

Is it possible to run a trigger on Table Creation in MySQL

Simple Question. Is it possible to create a Trigger that runs everytime a Table is created. The goal is to create a metadata table for each table, but I can worry about dynamically passing the table ...
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1answer
27 views

MySQL keeps getting “connect” commands 100X per minute!

My server was having performance issues, things loading slow, pages not loading, etc so I ran the "top" command after logging in via SSH. I noticed the CPU kept jolting up to 40%, on and off, when ...
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1answer
19 views

What to monitor (key indicators) for MySQL server

I have installed Munin for monitoring my MySQL database server. It enabled a large amount of MySQL plugins out of the box. Since running these plugins can be CPU expensive I want to limit them to the ...
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1answer
18 views

MySQL order of query

My query return like this. 12 14 14 99 78 78 54 I want result to be sorted so that no same number comes consecutively in the result. The result that I want is like this. 12 14 99 14 78 54 78
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1answer
53 views

Mysql closing immediately after new installation

I am using mysql as an backend for my webapp ,the software ran without any glitch but today it gave unexpectedly ERROR:2003 i tried many solution on the internet but none worked. so reinstalled the ...
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2answers
50 views

query to select data between todays date as well as tomorrows date time upto specific time

I have database "raj" with table "pagination" In table pagination have "id", "actualtime" and "created" field id - auto_increment name- varchar created- datetime I want to display all rows which is ...
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1answer
198 views

Is it safe to use mysqldump to backup and restore a master-master cluster

Not sure if the specifics matter but just to get it out of the way I am talking about a Galera cluster on XtraDB (MariaDB). I have a master-master setup and am interested in backing up and restoring ...
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1answer
7 views

How to check mysql password change and other events logs

Recently someone change my phpmyadmin password and drop database I think it was sql injecting. Now I want to find information about this like when, how and who change my password Please tell me ...
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1answer
95 views

Best Indexing Strategy for Query with Equality[A], Range[B], Group By[C], AND Order By[count(P)]

I have a poorly performing query: SELECT user_id, count(item_id) as count FROM table items WHERE category = 'magazine' AND created_at > 1384754400 GROUP BY user_id ORDER BY count(item_id) desc ...
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1answer
2k views

Amazon RDS - Can't connect to MySQL database server?

So I've been working on this issue for a while now, and I'll explain what I'm trying to do. I'm trying to connect to a MySQL database server, hosted by Amazon Web Services in the Amazon RDS service. ...
0
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1answer
312 views

NVARCHAR issue when migrating from SQL Server to MySQL with MySQL migration wizard

My issue is similar to this one but and I have tried what has been suggested but I still get the error. I have set the target column from VARCHAR(5120) to TEXT (tried LONGTEXT too) but the issue still ...
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2answers
14 views

Update a date_modified MySQL Record Field ONLY when other fields have changed using CASE statement not working?

I have asked my question on Stackoverflow but have not really gotten any answers so I am trying over here now. I have the MySQL query that is ran in a PHP script below. What it does is Inserts a new ...
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1answer
120 views

mysql replication missed quite a lot SQL statement

I have set up a master/slave with mysql-5.1.73 The master's binlog format is "statement". The master and slave seemed running very well with slave status: Slave_IO_Running: Yes ...
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2answers
229 views

What are the different ways to keep track of active and archived data?

I'm looking for different ways to keep track of both active and archived data so I can pro and con them. The system: I have a computer with a database on it. The database has several tables in it; ...
0
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1answer
48 views

Update query in a trigger

I have a configuration table: Table: refdatecol - id int(11) startdatecol varchar(100) enddatecol varchar(100) datecolTable varchar(100) This table holds the user configured column names ...
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2answers
104 views

How to verify data dumps between two MS SQL and MySQL

I'm trying to verify data exported from MSSQL and imported into MySQL is 100% accurate using MD5 hash. On Linux, I'm using md5sum and WinMD5 on Windows. The encoding is the same: UTF8. I tried both ...
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2answers
50 views

Unexpected result from query based on old column value

I need to update a column and based on the old value, update a second column. After googling I came up with THIS (*nr 4) solution: copy the table to have the old value at hand. The table looks like ...
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1answer
39 views

Migrating database with views trough phpMyAdmin causes error in second host

I'm trying to migrate a database which contains some views and I'm doing trough phpMyAdmin export feature. MySQL version on servers are: Server to migrate: Server version: 5.5.34-0ubuntu0.12.04.1 ...
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29 views

Combining fields to make a unique record or keeping them separated

I've been asked to implement what has before, been a bunch of CSV files, into a MySQL database. I'm at a point in the design where all the schemas, tables and fields have been mocked-up; however I'm ...
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1answer
3k views

MySQL crashes randomly with “Database was not shut down normally” message in log

I am having an issue where, for no apparent reason, my MySQL server crashes and has to restart. Essentially, the error log has entries like this: 131128 12:16:35 mysqld_safe Number of processes ...