MySQL version 5.5 - please also tag with mysql for search purposes.

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MySQL Trigger at Insertion with nested CAST

So I'm using MySQL 5.5 and trying to insert a VARCHAR as ID (since my teacher requested so), I am trying that each time there is an insertion of a new USER, a trigger automatically assigns an ID to it....
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28 views

Optimising a query with two aggregate fields

I have a table in a MySQL 5.5 database with around 7 million records, with fields typeId, regionId, scanTime, scanId and a query that returns around 239,000 results. For every combination of typeId ...
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adding rows vs creating new tables MySQL

I am having a table where I have not more than 15 columns (maximum data type of any of those column is SMALL INT and only a single column of type VARCHAR with maximum 20 chars only). Out of those 15 ...
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server response is getting slow day by day

MySQL server 5.5 > running in Linux Box is getting slow. MySQL server is being used by Java Web application, please help me to figure out the problem.
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803 views

#1041 - Out of memory issue in mysql [closed]

I am using Amazon RDS db.m1.medium instance. It has at least 40-50 database and atleast 10k table. For last one year it was working fine, but today I was altering one table It started giving error. I ...
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44 views

MySQL order by is equal, in what order are the results returned?

I use mysql Ver 14.14 Distrib 5.5.44, for debian-linux-gnu (x86_64) using readline 6.3 I have rows that are ordered by an order column. Turns out, many times, the order number is the same, say 1. ...
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77 views

MariaDB is Forgetting Previous Auto Increment IDs

I'm using MariaDB 5.5.39, and it seems like it is forgetting the max id of the auto-incremented primary key if I delete all rows from the table and then too much time passes before another row gets ...
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27 views

selecting duplicate values with a condition from a mysql table

I have the following table in mysql: Key DI CI FD FA NM Valid_from Valid_to 0 1224468 123 2012-06-30 3 6 2013-01-23 9999-12-31 1 1234567 123 2013-12-31 3 ...
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Special Operators in MySQL

I am going through the MySQL doc here and reading about the operators. I couldn't find anything related to special operators over there. Hence I am wondering, is there anything that exists and falls ...
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477 views

Mysql Tuning for a small server

I have a small Cloud Server running under Ubuntu 2 core, 2GB ram and 2GB swap, with Plesk Panel, Apache, Nginx as reverse proxy and Mysql 5.5. I have about 18 domains hosted here and each domain has ...
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How can I get month wise leave for a financial time period for an employee in MySQL?

I have the following columns in a table: start_date end_date no_of_days start_day_half -- (if the starting day to be a half day then its flag is 1) end_day_half -- (if the end day to be a half ...
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31 views

Unable to connect to mysql remote

I am struggling to connect MySQL database with my application, I am having the following set up 3 Applications running in cluster mode and trying to connect with same DB. MySQL database running on ...
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101 views

Insert and Update Queries Log in MySQL

I have sensitive information in multiple databases on the MySQL Server. I need to record which user have inserted or updated the record and incase of update we should be able to see the previous and ...
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MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) can't search number

SELECT *, MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) AS Score FROM search_table WHERE `date` > DATE_SUB(NOW(), INTERVAL 1 MONTH) AND MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) ...
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What should be the best practice to alter the table using the script to shift columns

I have a MySQL table which has columns 93 in it. All first 92 columns are INT(11) and the last column is of type DATE. |number|0|1|2|3........|88|89|90|ddate| | | | | | ........| | | | | ...
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49 views

How to reconfigure primary key columns

I have a series of tables in my database that are using DATE as the primary key. I would like to reconfigure the tables so that an AUTO_INCREMENT ID field is the primary key. What is the best way to ...
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29 views

MySQL Event Failed to Run

We have a selection of MySQL 5.5 Databases running on Debian Linux, We use MySQL Scheduled Events for certain processes, and until now they have always run as expected. But yesterday we had to move ...
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60 views

mysqldump slows down to a crawl

I have a table with ~10mln records that I want to dump. Running: mysqldump --opt --skip-extended-insert database table > table.sql While monitoring progress I have noticed that first 9.8mln ...
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RDS MySQL Storage and N/W Usage

have Single Schema and single MySQL Instance on RDS Where my website users are creating app and app data stored in MySQL database in my schema each app has Unique id. One user may have one or more app....
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Not able to connect to local MySql database “only” when connected to VPN on VM [closed]

Setup: MySql installed on my Mac using Xammp VM installed using VMware Fusion running win XP. I am able to connect to the mysql database through my VM normally. As soon as I connect to a VPN it ...
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79 views

Memory usage still growing

I have problem with my production mysql server. The memory usage is still growing and I don't know why. Trouble started when we changed the server. My mysql version: 5.5.44-0+deb8u1-log - (Debian). [...
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Enormous MySQL 5.5 Handler_read_rnd_next

The value of Handler_read_rnd_next is actually 91,3 G on my Database server but I am pretty sure that all tables have proper indexes. I am 100% sure that there is no query with a WHERE clause that ...
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84 views

Mysql slave use more memory than master server

I have used top command to check memory usage on both mysql master and slave server. Master is using only 12% of allotted memory but slave is using 82%. configuration wise both are same. can anyone ...
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Database design: history - transactions, states, durations?

I have not delved into this type of db info before, and it seems foreign to me what I need to do. So I would ask if this seems familiar to you, and is there a way this is generally done? (And would ...
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Proper database configuration

I'm running MySQL 5.5 on Debian 7.8. My entire DB is 2200 MB large (all tables are InnoDB), the mysql process is taking up to 6G RAM but still I think that not evrything is loaded in RAM I have large ...
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MySQL - installed version 5.5 but mysql --version says 5.0.95

I'm running CentOS 5.2 and upgraded MySQL to 5.5. When I run mysql I get this: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 11 Server version: 5.5.45 MySQL ...
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MySQL Load XML Infile with dynamic file name

I have a shell script which loops through a folder and picks up a set of files in turn. I then pass the filename to a .sql script so that the file can be imported into my database. BUT, I can't for ...
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MySql - How to monitor the amount of reads/writes to the DB

Is there a way to fetch the amount of reads / writes made to the entire DB (MySql) in a given period, e.g. the amount of read / writes in the last hour?
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Database Architecture & Design

I am building a web application for project management which will be hosted on my servers. My application design is like this 1 - user register 2 - domain name will be created i.e abc....
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Migrating a DB of mysql 5.0 to 5.5

Sorry this is a newbie question. I have a DB of mysql 5.0 on a shared host and I would like to migrate this DB to another mysql server (5.5) on another shared host. What I did is like this. ...
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33 views

Create SQL Query in function or PROCEDURE

I am trying to create function inside MySQL to create several queries for example : DELIMITER | CREATE PROCEDURE queryBuilder(_tableName varchar(100)) BEGIN SET @str_query = '...
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471 views

MySQL performance issue - intermittently slow queries

I manage an intranet application used by around 50 staff in a few locations. The application is hosted on a Windows Server 2008 VM with 8GB RAM and MySQL (5.5) is running on the same server as IIS. I ...
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293 views

MySQL Write performance bottleneck

We are trying to diagnose a MySQL Bottleneck, specifically for data writes. Basically, we have a single process that picks files from a folder and load into a MySQL table X using LOAD DATA CONCURRENT ...
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62 views

Really strange behavior using variables in MySql query

I was answering a Question on Stack Overflow forum and the OP notice a really strange behavior that I could reproduce using the SQLFiddle site So lets go to it. We have this setup: CREATE TABLE ...
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MySQL can't connect as user with password locally

I am running into a strange authentification issue. Users can't connect to MySQL locally using a password, but they can without one. mysql -h localhost -u someuser -psomepassword won't work ...
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142 views

MySQL percona 5.6 to MySQL 5.5 replication

Scenario 1 I am having a MySQL DB on 5.5 which is compliance, So need to upgrade it to MySQL 5.6. while doing this we see that 5.6 is running slow, were as it runs perfectly on 5.5 backup. Scenario ...
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What happens if there is missing data in the slave MySQL server

At the data center there was electricity outage. And it appears that at that time my replication stopped syncing because it said something like this; "I cannot find the next position. Last proper ...
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35 views

Query to get the users who have a application approved

I have two tables Users and Submissions . Need to find the query to get the users who have submitted atleast one grant and have never won . I can write a subquery and achieve it .But I would like to ...
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273 views

Subtract time difference between two columns in a table

Problem: How can I subtract the TIMEDIFF between two sensors (sensor 1 and sensor 2 in the example below) and return the the value in mili seconds? How do I get with the resolution of milliseconds? ...
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80 views

MySQL – Backup/Restore Selected Tables/Fields Only

I support a Python application (includes some C modules) that utilises a MySQL database. A number of clients are running this in a standalone environment but have agreed that we can use their data ...
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48 views

How to pivot a CSV file into a table

Input: a CSV file which cannot be changed prior to import Desired Output: A table where CSV_File.Name is a column and CSV_File.TagValue is the data in that column with a Key field Timestamp column ...
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Identifying table causing runaway rollback in MySQL 5.5 (InnoDB / Windows)

I have a large database (180 GB), running under Windows, with a runaway rollback that starts running as soon as the database is started up. I have started the database with innodb_force_recovery=3 ...
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How can i find next binary log to restore in mysql database

i am using mysql database,one database is writing data in binary log and those logs are sent to another machine through scp.In remote machine i want to restore binary logs. through mysqlbinlog bin-...
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280 views

MySQL starts using > 90% of CPU, “Copying to tmp table on disk” and “converting HEAP to MyISAM”

I have a server where MySQL is periodically taking up 11 of the 12 CPU cores. Once this starts it doesn't end until I restart MySQL. At least, I haven't let it run like this for more than a half hour ...
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74 views

changing mysql configuration . Getting errors like Table is marked as crashed and should be repaired

On Our server I have done following configuration for Database: [server has 2 core, 2 GB ram and windows 2008 operating system] query_cache_size= 32M [Old] query_cache_size= 50M ...
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456 views

View active MySQL connections per user

I need a query that will give me the active or open number of connections to a certain database for a certain user. I have been searching for hours and have come up with nothing so far. I am close, so ...
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Composite index works for larger set of data, but not smaller

This is a follow on question to optimise my.ini for key query Data model: DROP TABLE IF EXISTS `contract`; CREATE TABLE IF NOT EXISTS `contract` ( `id` int(11) NOT NULL AUTO_INCREMENT, `...
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mysql performance

Currently,we are using mysql 5.5.4 database on server with 4GB RAM,500GB HDD on Linux.There are predominantly 3 databases and the maximum size of database is 100MB.Assuming data grows at rate of x mb ...
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Is it possible to block a specific query, or return a static result?

Before you yell at me for doing it wrong, I know I'm doing it wrong. I'm using WHMCS (source code is not available), and we have a quarter of a million invoices. One particular query, which runs on ...
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50 views

Multiple select for single row insert

I need to insert a row into a table by selecting value from multiple tables. I want a row to be inserted from multiple tables. insert into tab(id,name,date) values ((select max(id)+1 from tab),(...