All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

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2answers
192 views

Disable MySQL replication

I'm running following: # cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.6 (Santiago) # uname -a Linux X 2.6.32-504.3.3.el6.x86_64 #1 SMP Fri Dec 12 16:05:43 EST 2014 x86_64 x86_64 ...
0
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2answers
118 views

One MySQL Database or Many MSSql Databases

At the moment I have an in-house Access database, data stored by our online survey provider, and data stored by our project management provider, both in databases. What I want is an in-house database ...
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3answers
2k views

Automate CSV files to MySQL Database?

I'm a little mind struck at the second as I am looking to automate the following sequence: Extract Data from Microsoft Access Save files as CSV Connect toMySQL server Run one SQL file that exports ...
1
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3answers
746 views

Select random 10 unique rows from MySQL database?

I have one table (questions) with 54 questions. The students have to answer all 54 questions. I have to show 10 questions at once, then next 10 and so on.... I have to select 10 questions ...
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0answers
19 views

Assigning items to containers

I have two tables for separate things: One table for containers, one table for items. They both have things like descriptions, title, and of course ID fields: container_ID and item_ID. My containers ...
2
votes
2answers
750 views

Primary key auto increment best practices

Apologies if something similar has already been asked, I wasn't sure of the best term to search for to get what I was after, so please let me know if there is already a bunch of other related ...
1
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1answer
53 views

How to transition from a statement based log to row based log for Galera replication?

I'm new to clustering and I'm trying to implement a Galera cluster. I'm transitioning from a standalone MySQL instance to a MariaDB Galera Cluster consisting of (at the moment) 2 nodes. I have ...
0
votes
1answer
190 views

MySQL Workbench — How to efficiently review large database tables?

I have a database table with 900,000+ rows, 20 columns, mostly string data. Using MySQL Workbench, I want to page through the entire contents of the table to see what exactly has been inserted into ...
2
votes
1answer
325 views

Is it possible to gain the precise position of a live mysql database when performing full backup

I have a production database that I usually run fullbackups on once every week. I have bin logs turned on for incremental backups. The production server is on the west coast while business hours are ...
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1answer
1k views

is camel case for column names safe?

I have a database where column names are all camel cased. No problems encountered. Will that be a problem under some scenarios, as per recent versions of MySQL, Postgres?
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0answers
36 views

How to combine 3 queries into 1 including set?

I have 3 mysql queries and each does specific job, the problem is I can't figure out how to combine 3 queries into 1. I'll write down all 3 queries and explain what each does, thus you can figure out ...
0
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2answers
77 views

Creating database level user in MYSQL

Our MySql production server has two different databases in it. For reports I want the user to only be able to see reports database and not main database. I created A user 'username@%' for the reports ...
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0answers
387 views

MYSQL: InnoDB inserts wont rollback transaction inside a stored procedure

I have this stored procedure: START TRANSACTION; code_gen_loop: WHILE @Codes > 0 DO IF MOD( @Codes, 10000 ) = 0 THEN EXECUTE qry_status_stmt2; EXECUTE qry_status_stmt3; ...
1
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1answer
213 views

Moved MySQL datadir Now Server Will Not Run!

My problem yesterday (MySQL - Alter Table Fails As Workbench Tries To Create Existing Table) was caused by /dev/sda2 (/root) running out of space. The cause of this was that, by default, MySQL had ...
0
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2answers
116 views

Where deadlock happen in mysql

I am unable to read below logs of mysql after executing SHOW ENGINE INNODB STATUS command. Can anyone please help me out where the deadlock has happen? ------------------------ LATEST DETECTED ...
0
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1answer
1k views

No syntax for Nonclustered index in MySQL?

So, I have seen people discussing about differences between clustered V Non Clustered index, however, I didn't see any syntax for Non Clustered Index in MysQL. How does MySQL creates Nonclustered ...
0
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2answers
33 views

mySQL query with field replacemnt?

I'm need to run a query from mySQL 5.6 which involves looking up date from different tables. I'm new to mySQL and I'm not sure what this operation is called, or else I would have just googled the ...
0
votes
1answer
127 views

mysqlslow - excluding queries from mysqldump

I would like to ignore the queries in my mysql-slow log that originate from mysqldump using SQL_NO_CACHE as the trigger word. My experiences using regex are limited at best and I'm unable to find any ...
0
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1answer
90 views

Change Storage Engine on Referenced Tables

i need to change storage engine from 'InnoDB' to 'MyISAM' on some tables of different databases. So i made a script file to do so: #!/bin/bash DATABASES=$(mysql -u XXXXX -pXXXXX --skip-column-names ...
2
votes
2answers
1k views

MySQL ssl setup failed

I am following word by word of http://dev.mysql.com/doc/refman/5.0/en/creating-ssl-certs.html for creating SSL certificates to setup SSL enable replication but it is not working for me. Steps which I ...
0
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1answer
53 views

Records in a table unique period

I have the following table: +--+---------+-------+--------------+--------------+ |ID|HEADER_ID|VERSION|FROM_DATE_TIME| TO_DATE_TIME| +--+---------+-------+--------------+--------------+ | 1| ...
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0answers
56 views

Help with ER design

So i am trying to create a db for a restaurant as a homework assignment.. However there is a spot that confuses me and involves the dish entity. "Every dish must belong to a category ...
1
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1answer
1k views

MYSQL-BEFORE UPDATE Set value of Column A to value in Column B if Column A is to be updated

I have a nightly scheduled event which updates all rows in 'products' table with the newest 'unit_price' from a price list table where 'price_list.active-date' is >= the CURDATE(). What I need to do ...
1
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1answer
138 views

Mysql Partitions with Partition limit

I have a partition table on basis of Primary key having 1.5 Billion rows in it. But when i check ibd files only 80 ibd show in GB's whereas 120ibd shows 1MB file. I would like to know how does the ...
0
votes
1answer
88 views

Why group_concat and SQL_CALC_FOUND_ROWS do not work with each other?

I have following query which contain group_concat and SQL_CALC_FOUND_ROWS together as I want result + total no. of records present in it. SELECT SQL_CALC_FOUND_ROWS GROUP_CONCAT(ca.id) FROM ...
0
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3answers
499 views

MySQL - Alter Table Fails As Workbench Tries To Create Existing Table

I have been trying to add another column to a table in my database using MySQL Workbench. This generates an 'ALTER TABLE' command which then fails as it fails attempting a 'CREATE TABLE, which it ...
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2answers
130 views

How to Permanently solve MySQL error 2002 (HY000)

I have a problem on my cloud server with 2GB of RAM and 40GB Hard Disk that's hosting a Wordpress website that receives around 1000-2000 hits a day. My problem is that MySQL is always crashing and my ...
1
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2answers
3k views

2013. Lost connection to MySQL server during query error

I have a table with close to 20 million rows. In phpMyAdmin, I attempt to add a new column: ALTER TABLE `myTable` ADD `newColumn` TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '0'; After about 60 secs ...
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2answers
199 views

Invision Power Board 3.4.6 - mysql locks during query with pending updates

about 2 weeks ago, we started experiencing random lockups and slowdowns on our forums. We've been running this site for around 6 years minimum with no issues. the site and db are on dedicated vms. The ...
0
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1answer
108 views

Zerofill Auto Increment - mySql

Ok, So I'm working on an app and I can't remember, for the life of me, why I set a zerofill on an Auto_Increment column when I created the database. And I couldn't exactly find any compelling info ...
0
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1answer
135 views

Recovering Mysql - how to get a dumpfile from wampserver and none running db

I had the following: - Wampserver/mysql/drupal + batch file with auto backup by use of mysqldump. - Backup was distributed off and online. then : my laptop was stolen :-( and I need to recover ...
0
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1answer
190 views

How to recover a dropped mysql database with its procedures?

I had some databases on a server and MySqlserver on this server has been uninstalled accidentally by someone. I had some backups on this server and could recover all tables and their data successfully ...
21
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6answers
4k views

DELETE command not completing on 30,000,000 row table

I have inherited a database and am looking to clean and speed it up. I have a table that contains 30,000,000 rows, many of which are junk data made by an error by our programmer. Before I add any new, ...
1
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1answer
169 views

utf8 and utf8mb4

I am converting a few of my tables to utf8mb4 as well as the connection from PHP to MySQL to utf8mb4. This is so that I can support characters used for Emoji in my website. I have two questions ...
0
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1answer
200 views

How to only display a variable in PHP inside a MySQL query when it has a content or when a condition is true?

How do I only display $mon or any variable when it has content? whenever i use this syntax and for example, monday must contain the number 1 and tuesday would contain number 2 and the other ones have ...
0
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0answers
33 views

How to sync 3 databases of 3 websites?

The process of sync are; the first website will input a proposed project with its information and details then if it is approved it will update the the second website which will mark the project ...
0
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1answer
88 views

Name of Mysql database folder

I try to access to mysql data via filezilla and download to my pc, What is name of folder where is my mysql data ? I use ubuntu. Thanks.
2
votes
2answers
587 views

Is there a best practice for recurring calendar events

I'm not a dba but a php programmer, so that I'm not an SQL pro. Now, I have searched in both programmers and dba stackexchange sites but the answers are too specific or not conclusive. My question is ...
0
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1answer
295 views

Setting a column's default value by adding a constraint

I wrote this query: ALTER TABLE test2 add constraint setting_value33 default male FOR namee; But I get this error when running it: You have an error in your SQL syntax; check the manual that ...
0
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1answer
99 views

Slow ranking values in MySQL

I have a table of around 30 million retail products, with various INT columns that describe sales counters and pricing at different retailers. I'm supposed to display well over 70 different rankings ...
0
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2answers
57 views

Can't access MySQL after sourcing a database and reboot

I'm trying to set a local dev environment on a Debian VirtualBox and am now stuck for days with the following situation. After setting up apache, php, mysql, pma and got eveything running, I open the ...
0
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1answer
433 views

Large MySQL operations slowing down SELECT queries on unrelated tables

On a fairly busy SQL server, we sometimes need to do large index-building operations (after importing ~6GB tables). The indexes are built using the more efficient "Repair by sorting" method, rather ...
1
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2answers
195 views

1 hour query, is there another way to do this?

I saw a couple questions similar to this but none could answer my question, really. I have two tables, and I am trying to find those rows where a match is found. user has about 350,000 entries and ...
1
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1answer
156 views

Sql Insert into with duplicate key

Ok so, I'm still a beginner in databases. I have this code: $sql=" INSERT INTO complaints_members (password, complaint) VALUES ('$mypassword','$submit') ON DUPLICATE KEY UPDATE ...
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0answers
86 views

Database schema design for individual configurations

I'm trying to design a database schema that allows me to store customer custom built products. As a simplified example: A user can buy a cupboard, draws, boxes, and dividers. A cupboard has 2 tiers. ...
1
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2answers
642 views

Is possible to backup database online using rsync?

Some people tell me that the backup database on-the-fly using rsync is possible. I think it is possible but not safe because some log, buffer... is not flushed. Database is being recovered from the ...
0
votes
1answer
94 views

Nice query to get my friends

my table has this structure: User_ID | Followed_ID Example row: 33 | 36 Means that user 33 follows user 36. If exists a record like 36 | 33 then the two users are considered friends. ...
2
votes
1answer
347 views

Order by where conditions

SELECT * FROM table WHERE key REGEXP 'some long regular expression' OR key REGEXP 'some other long regular expression' ORDER BY key REGEXP 'some long regular expression' DESC, key REGEXP 'some other ...
1
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2answers
77 views

Need to convert date to word using trigger

I have created a datetoword function in Mysql. Checked the function working fine. Now using this function need to convert the date from field1 (date-datetype) to field2 (Varchar-datatype) within the ...
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0answers
22 views

i always get o for my result.why is it so?

CREATE DEFINER=`root`@`localhost` PROCEDURE `roomAvailbility`( IN checkindate date, IN checkoutdate date, out roomtype char(20)) BEGIN select count(*) INTO roomtype from room_1401557b ...