MySQL : Open-Source, Relational Database Management System

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How to improve the performance of SELECT queries with multiple JOINs on a 50GB database hosted on AWS m3.medium MySQL RDS?

Example query: SELECT p.ListAgentEmail, p.ListAgentFirstName, p.ListAgentLastName, p.ListingKey FROM Property_RES AS p INNER JOIN Property_RES_COUNTIES_OR_REGIONS ON ...
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684 views

To what extent is MariaDB Java client a perfect replacement for MySQL JDBC (Connector/J)?

Premise: I ship a Java application which will make a JDBC connection to a MySQL database. (At the time of this writing it could be 5.1 or 5.5, but hopefully the question and answer don't rely heavily ...
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12 views

Query results that not are in previous query result

I want to retrieve from my table the id_product of the products which haven't got some attribute and it's value is not the ones i want For example i want the id_product of the products in which ...
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227 views

Consolidated realtime mysql backup with master/slave setup or binlog

I have 20+ mysql servers and their have low write requirements. So, I want to see if any way I can replicate the data/binlog from these servers to a single slave so realtime backup purpose. If I ...
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3answers
36 views

MySQL: List databases with tables

Is there a way to list all my databases with tables in a single command? Expectation: mysql> SHOW DATABASES, TABLES; DB1 table1 table2 DB2 table1 table2 table3 ...
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24 views

BLObs – Should I Store In Database Or in Directory Structure?

BLObs – Should I Store In Database Or in Directory Structure I have been developing a database to replace an ageing data structure that contains 1000's of files within a directory structure. The ...
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107 views

Index to fix this query MySQL

We have an extremely large forum running lots of third party software (Most of which doesn't run all that well) and we're starting to optimize things as time allows. This query keeps popping up in the ...
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30 views

Very high CPU caused by mysql service [on hold]

A running mysql service uses CPU in a crazy way. (See attached screenshot from htop) I followed the instructions here with no luck. My server specs: CPU: 1900Mhz . Intel Hexa-Core Xeon E5-2420 ...
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12 views

maxscale read/write split with mysql

I am setting up mysql MMM with two slaves. I will use slaves for read only and master for writes only. I do not have read/write split in application. I came across maxscale program. I was wondering if ...
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20 views

Stored procedure to check if username exists

I'm trying to write a stored procedure So far I have this, but it always returns 1 CREATE DEFINER=`root`@`localhost` PROCEDURE `USER_EXISTS`(IN `USERNAME` VARCHAR(64) CHARSET utf8mb4) SELECT CASE ...
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25 views

Merge multiple columns into one column in different table?

I've done this before, but I don't remember how. I need to select all rows from several columns in one table and insert them into one column in a different table while keeping them all on separate ...
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11 views

How to pass the input parameters to dynamic Pivot stored procedure

This Is My Query: DELIMITER $$ DROP PROCEDURE IF EXISTS `leavemanagement`.`SP_ViewAttendance` $$ CREATE PROCEDURE `leavemanagement`.`SP_ViewAttendance` ( IN in_branch_id varchar(10) ) BEGIN ...
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141 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
13 views

restore mysql 5.0.77 backup to mysql 5.5 [on hold]

I am having backup of mysql version 5.0.77. I want to restore backup of 5.0.77 to our new machin having mysql version 5.5 What is the procedure?
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6 views

When will store procedure/functions support result set as return type

I have noticed that MySql doesn't support result-set on a store procedure and functions, which means return a table. So I can't do things like CALL sp_my_store_procedure() ORDER BY id ASC; Or ...
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31 views

SQL CLR in MySQL?

Can we call SQL CLR in MySQL Server using User Define Function? I want to create trigger in mysql. It will call user define function and this UDF will update the table in SQL Server.
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i want to get Hierarchical structure of category and subcategory for nth level in one mysql query

i want to get Hierarchical structure of category and subcategory for nth level in one mysql query. i try some solution but it's not work properly. i try following query but it only get only ...
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716 views

Why is my RDS mysql slow query log full of server restarts?

One of my RDS mysql databases is giving me warnings about the slow query logs taking up significant space. The logs are rotated once an hour, and contain a dozen repetitions of: ...
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11 views

Compare values in SQL having dots

I'm comparing values from two different database. In one table the name is stored with dots(i.e A.B C) and in another table the same value is stored as AB C(i.e in second table none of the names ...
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57 views

Select the last massage for each user [on hold]

Please help me with a query. I know, that my english is not even on basic level, but I try to explain. I want to write a query that selects every last massage from each user (I want to create a dialog ...
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21 views

MySQL replication - how to read from slaves? manually?

MySQL Manual - Replication: "Scale-out solutions - spreading the load among multiple slaves to improve performance. In this environment, all writes and updates must take place on the master ...
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1answer
155 views

How to export a MySQLtable with a longBLOB column to an Oracle database?

In MySQL I have a table: Select * from Dummy; Columns like below: id name salary binary_col 1 a 100 A.pdf 2 b 200 b.pdf 3 c 300 c.pdf 4 d 400 d.pdf 5 e 500 e.pdf ...
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587 views

MySQL failover - Master to Master Replication

My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered ...
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1answer
125 views

mysqldump 5.5.25 use swap instead of memory

mysql version 5.5.25, while use mysqldump to dump big tables, it eat lots of swap while there is lots of free memory. # free -m total used free shared buffers ...
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4k views

MySQL requires FORCE INDEX on huge table and simple SELECTs

We have an application which stores articles from different sources in a MySQL table and allows users to retrieve those articles ordered by date. Articles are always filtered by source, so for client ...
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How to maintain relationship integrity when normalizing?

I need to copy several columns of data into several other tables in the name of normalization. Moving the rows themselves will be easy, I can do that. My dilemma, is how to preserve the hierarchical ...
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3answers
29 views

Prepopulate database with empty / null values [mysql]

What would be the best way to pre-populate a database with 100 empty fields and then begin the Auto_Increment? What I mean to say, I want to reserve the first 100 userfields (ie UIDs which are ...
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24 views

MSSQL - Creating backup of 1 day worth of data and then merge them to make a full database [on hold]

I am new to this forum let me know if there is any update to be made. Use-case: I would like to create a snapshot daily which would have 1 day worth of data for 7 days and then combine it with ...
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1answer
148 views

Query to get reposts from people the user is following

I have a table posts where all the posts by users are stored, the structure of this table is as follows. | post_id | post_user | post_content | post_date | The users table is as follows. | user_id ...
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1answer
148 views

Data Warehousing strategy

I have a busy MySQL database with 1.6 million records a day, I'm looking to replicate this data to another server, then run a clean up job on production database to maintain small database in ...
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1answer
18 views

MySQL Replication Master Slave Architecture - Web app that is based on the SLAVE DB

We are developing a web application (Spring mvc based app) that uses a MySQL DB. (lets call it the "original app") The DB architecture uses a MASTER-SLAVE configuration with replication. The web app ...
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What is the best way to implement user accounts and privileges? [migrated]

I am wanting to make a website with user accounts, but am not sure what the best way is. User accounts require security and i'm not sure how to approach it, I know I could use a database username and ...
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1answer
36 views

MySQL Deadlock - accessing different primary key values also creating deadlock

I went through MySQL logs and found the reason for deadlock 1st thread is trying to execute below query. Which is waiting for thread 2. UPDATE M_SAMP SET MM_Q_IND=0 WHERE M_ID IN (SELECT M_ID FROM ...
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1answer
693 views

Can't change root password: “The system cannot find the file specified.”

I'm trying to change the root password in MySQL on my development machine (I've just installed MySQL, so it currently doesn't have a password), but it keeps failing with the following error message: ...
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1answer
22 views

My HD crashed and I can't start MySQL

I am on Windows 8, my SSD got corrupted and I installed Windows on a new drive. I had before MySQL 5.6.12, now I installed 5.6.17 and tried to move the entire data dir. The location of the MySQL ...
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1answer
12 views

Adding a column to aggregated data where new value only applies to a subset of the aggregation

Having trouble explaining this. I have a table like this: Label | Value A | 3 B | 1 C | 4 And another like this: Label | Value | ID A | 1 | ID1 A | 1 | ID2 C ...
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1answer
11 views

MySQL Replication, Can i add a trigger to the SLAVE db?

Is it possible to do so? The trigger will insert some rows into a unique table that exists only on the slave.
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27 views

Suitable schema to record email sent and response received and invoicing in DB

When a form submission is made on a website: An email with form's details is sent to a set of recipients email addresses stored in a DB. The email contains a link for the recipient to show interest. ...
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1answer
21 views

MySQL Insert Performance

i've been tasked to check whether MySQL can be used for Large DataWareHousing Requirement is as following the Table contains 83 column each row pay load size is 1272 bytes the requirement is the DB ...
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2answers
302 views

Should I use a compound or surrogate PK in a many-to-many table?

I have a database: DROP TABLE IF EXISTS `books`; CREATE TABLE `books` ( `isbn` VARCHAR(255) NOT NULL, `title` VARCHAR(255) NULL DEFAULT NULL, PRIMARY KEY (`isbn`) ) COMMENT 'Books used at this ...
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116 views

Can a slave with a dynamic ip update the master

How can I setup mySQL replication in such a way that a slave on localhost with dynamic IP can update the master as well as get updates from the master which has a static IP. The slave will not be ...
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1answer
435 views

MySQL (or MariaDB) multi-master without MMM

I've been reading blogs on MySQL multi-master setup. The way I've used MySQL replication in the past was master-slave where if the master died (or was being taken down for maintenance) we would shut ...
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22 views

Centos 5.11 mysql-server 5.0.95 upgrade to mysql55w-server

Here's my thought process on my upgrade: mysqldump --all-databases > backup.sql service mysqld stop yum remove mysql mysql-server yum install mysql55w mysql55w-server service mysqld start ...
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2answers
196 views

How can I optimize this query and support multiple SKUs?

My current query only can select one SKU at a time. I can leave salesite_id constant. If there is a way to also have varying salesite_ids that would be good too, but not necessary. Also any ...
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1answer
61 views

one or multiple tables mysql [on hold]

I have a table with 3 columns and i want to split it according to 3 last character in string of one column , it will be more faster or more performant or it's same one and large table ..?? i talk ...
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26 views

MySQL server stops accepting connections partially (“gone away” error)

Hope someone can help me debug this issue. There is a MySQL server 5.6.22 running on OS X 10.2. The load isn't too heavy. All databases are stored in InnoDB. From time to time it stop accepting ...
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286 views

Mysql HY000 the table table_name is full when adding new column

I can't add a new column innodb table which size's 16MB. when I try to add, mysql says HY000 the table table_name is full. I changed my tmp_table_size and heap_size but mysql still says same error. ...
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1answer
898 views

mysql dump a table to remote host [on hold]

i want to dump a table from localhost host (with public ip), here is the command so far, the command will be run on localhost mysqldump --opt --host localhost --user=username --password=password ...
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263 views

phpmyadmin not working after mysql update

i followed this guide to update my mysql form 5.1 to 5.5. After lots and lots of command and headache, i was able to upgrade mysql. i checked the version via terminal. But now there is another ...
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2answers
46 views

Excel spreadsheet into a MySQL database tables

I am relatively new at database design and would like to get this right from the start. I have had differing advice on how to do this and believe that the common suggestion of importing all the data ...