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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limit of open files: Debian Jessies´ MySQL vs Community Oracle MySQL

I have just upgraded from MySQL Jessie 5.5 to MySQL Oracle Community Edition v5.6. I have a particular MySQL server, that has around 230 DBs, and > 32k files/tables. Whilst for two or three years, I ...
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17 views

Is it possible to call java API from mysql stored procedure?

I am using stored procedure to migrate data from one schema to another schema. I need to use some complex logic which is already implemented as java API. Is it possible to call java API from mysql ...
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46 views

MySQL Bin-Log Courupped

In the recent time we have found that the bin log is getting corrupted, 20% binlog files were having errors, which couldn't even pass the sanity check by mysqlbinlog -u user -p mysql-bin.000021 | head ...
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37 views

“WSREP: MDL ticket” log entry

On a MySQL 3-node cluster, the error logs contain several occurrences of this metadata lock message: [Note] WSREP: MDL ticket: type: shared no read write space: TABLE (...) There's not much ...
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41 views

Cannot add foreign key constraint'?

Can someone please correct this code for me? When I click enter it says 'cannot add foreign key constraint'? CREATE TABLE entries ( Subject_id smallint auto_increment, Student_id VARCHAR(45) ...
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15 views

How to lock tables in a stored program if I can’t say LOCK TABLES? (in an ancient version of MySql)

MySQL does not allow LOCK TABLES in stored programs. But this is my problem: I have a large stored function to control “phases”. The function advances to next phase, if needed (rarely so), and ...
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91 views

Is the Aria storage engine really crash safe?

I maintain a PHP/MySql app for a big customer. Many of the tables were on MyISAM b/c that was the default when I started. On a newer server running MariaDB, some of those tables kept crashing. ...
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42 views

MySQL replication Got fatal error 1236

I am getting this error when starting a new slave replication from master. Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded ...
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37 views

mysql returns FUNCTION .LAST_INSERT_ID does not exist

I'm new to MySQL. I have created two tables. create table Shopping( Trans_ID int not null auto_increment primary key, date date, item varchar, quantity double, rate ...
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69 views

Phpmyadmin not displaying table data

I have a table named "log", which basically stores error log for my php application. My application has database running on rds, and recently i had to delete logs from this table, so i downloaded a ...
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50 views

How to collect prepared statements in performance_schema on MySQL 5.7

Just installed MySQL 5.7.10 64bit locally (Windows environment) and prepared statements are not being logged in performance_schema. In release notes it's being specified this feature is available ...
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28 views

Mysql partition - How to do list partitioning of a table that contains unique column?

I am doing mysql list partitioning. my table data is as below ---------------------------------------- id | unique_token | city | student_name | ---------------------------------------- 1 | xyz ...
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27 views

Configuring additional data node

After configuring the data node and the config.ini for the management node. When I run the ndb_mgmd -f /var/lib/mysql-cluster/config.ini --initial The table data that were created for previous ndbd ...
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61 views

MySQL performance issue after migration

I have a MySQL performance issue with a brand new server, and am somewhat of a beginner as a database administrator (I'm mostly a general-purpose Linux sysadmin). I'm looking for pointers where to ...
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53 views

Cannot restart mysql (installed natively) but possibly caused by a Homebrew package

I've previously been running mySql which I had installed with the dmg files without any issues, but I also have Homebrew installed and noticed some errors today which I fixed successfully but ...
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43 views

Copy data from one table to another

I have a table named cameraInfo and another named macTable. Both tables have a column for mac address and password. Not all the mac address in macTable are in the cameraInfo table. However, if the mac ...
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112 views

Error Code: 1098. Can't generate a unique log-filename /data/mysql-binlog/relay-bin.(1-999)

After starting MySQL 5.5 I receive the error message: Error Code: 1098. Can't generate a unique log-filename /data/mysql-binlog/relay-bin.(1-999) Can anyone point me out what the problem is? The ...
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65 views

Column Editing is Disabled. How to Enable?

I am using MySQL Workbench, in order to design an ERD (Entity Relation Diagram). I can make use of indexes, triggers, etc. but for some reason the columns tab, which allows me to add data or just ...
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47 views

Configuring MySQL Cluster

I'm having trouble in configuring my data nodes. My setup is 1 management node, 1 SQL node and 2 data nodes. I'm running mysql-cluster-gpl-7.4.8-linux-glibc2.5-x86_64 on my cluster. My question is do ...
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36 views

mysqldump: restored by mistake with no backup

While trying to take a mysqldump on a database, we have by mistake run a restore command mysql -u -p abc.sql <abc.sql. This has resulted in the abc database going back to a state 5 days back when ...
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59 views

Individual inserts wait for several seconds for primary key lock (inno DB)

my application inserts about 2,000 records in a table per hour, at some time the database started to delay this inserts throwing a "lock time wait" exception, after some research I got this output ...
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28 views

Get records with specific group name from table A and see if any exist in table B, if it does then add matching records in Table B to group

Let me start off by saying I am not a DB admin or a DB pro, I work with SQL as a php developer but that's about it. So I hope I can explain this properly and I hope one of you DB guys/gals can help. ...
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32 views

cannot install_db after deleting /var/db/mysql

I am trying to reset mysql5.6-server back to its installation defaults and blowout/nuke all the databases to start off fresh and clean. [root@yoda:~] # rm -fr /var/db/mysql [root@yoda:~] # mkdir /var/...
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73 views

DB table design for attributes with multiple entries (eg: Person -> Social Media)

I am trying to decide the structure of a DB table to store Employee data. I am bit confused on how to design attributes such as Address, Social Media etc. There should be provision for multiple Social ...
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37 views

Can't log in to MariaDB with --password=<password> but not with user-interactive login?

I can log into my MariaDB server when I put the password directly in the bash command, but not when I'm doing the user-interactive login (which is of course safer). root@vm# mysql -u root --password ...
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38 views

Database calculations question

I am creating a MySQL database that is going to be used to store a lot of timestamps. There are currently 6 timestamp fields that data can be entered for one row. I am utilizing timestampdiff to ...
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22 views

Wordpress MySQL - Prevent Duplicates

Hello, I am having troubles with my Trigger, I need another pair of eyes to figure out where I am going wrong. Basically all I am trying to do is to prevent wordpress from inserting duplicate posts (...
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65 views

mysqldump resulting in empty file

I keep getting empty files generated from running $command = 'mysqldump -uroot -pmysql pakaranak tamp2 > mydb_tables.sql'; exec($command); I'm using phpMyAdmin Version 2.10.3. So, any ideas?
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23 views

Is there an alternative to delete a procedure inside a procedure?

For my Bachelor Thesis I try to automate some recurring tasks in MySQL. One task consists of the deletion of a specific stored procedure. Normally I would create a stored procedure which takes one ...
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47 views

Server Performance Comparison

I have two computers with MySQL installed. I get very different performance between the two. On one a query takes <1 second when using SQL_NO_CACHE and on the other it takes ~6-7 seconds. The ...
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58 views

Error on connecting to mysqli

I have a virtual server that I'm running MySQL Server on that and Operation System is Windows Server 2012. from my own System I mean home PC , easily I can connect remotely to MySQL Server without ...
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26 views

Syntax error or access violation: 1286 Unknown storage engine 'InnoDB'

MySQL won't start after I changed the my.cnf file. After a lot of use on my site, MySQL crashes and I get this error: Syntax error or access violation: 1286 Unknown storage engine 'InnoDB' I ...
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24 views

relationships in access

I am making the database design of my website in Microsoft Access 2013 because it has a nice user interface and I believe it will help me understand everything a whole lot better with the UI. I have ...
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526 views

MySQL / MariaDB pid ended (cannot start mysql) in CentOS

I have had a system with MySQL up and running for years. I recently accidentally moved all the directories in /var/lib/mysql to /var/lib/mysql/mysql2 and then fixed it and moved them back... or so I ...
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49 views

Syncing DB's between local and live server?

I need to sync two tables between MySQL databases. I have read about MySql Replication. But not sure whether it can be used in this scenario. What I want to achieve is explained below. There are two ...
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100 views

MySQL Optimization (my.cnf)

My site has been extremely slow lately at peak times (3 hour window each week). My website is an auction site, Ajax-heavy and uses Pusher.com to update bid status and bid amounts in real-time. I tried ...
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93 views

mysql optimize table and mysqldump

I have a dbserver with about 1.000 databases. This year (2015) we didn't do anything about table optimizing at all. Also our had an uptime for almost a year (338 days). Our backup script with ...
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23 views

Dumping data to a CSV file

I am trying to export mysql data to a csv file and before I execute the command, I'd like to make sure the outcome as intended. If I run, mysqldump -u user -ppassword --no-create-info --tab=c:/temp ...
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17 views

how to disable a mysql database for specific time

In my application there was an exception on run time when due to some network issue database connection not created and application closed. To trace this in my application at runtime I need to disable ...
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43 views

MySQL Query Browser error 2003 after installing Apache Tomcat

I have installed MySQL Query Browser, it was working fine, but after installing Apache Tomcat it starts to show the following error error 2003 "Cant connect MySql server on localhost(10061)"
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37 views

Dealing with multiple user types, modules and requirements

I have the following database schema. Basically, it all comes down to this: - users can have multiple user types - some user types come with specific requirements for a complete profile - there are ...
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39 views

MySQL: SELECT (column == 'value') return result of type “LONGLONG” instead of BOOL

When I do SELECT (column1 == 1) FROM table1 AS isOne; I'd expect to have a result set with a column of type BOOL, a.k.a. TINYINT(1). Unfortunately, I receive a "LONGLONG". Here's an experiment. ...
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17 views

Fire trigger when Routine was created in MySQL

I try to track changes of Stored Procedures and UDFs in MySQL. That means, if a SP or UDF is created, I want to copy the information into another table. I tried to clone the information_schema....
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31 views

Replication not working

I configured master slave replication and it worked fine however it stops working after 5 min or so! Although slave status show that replication is fine, however whatever I insert in master isn't ...
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118 views

how to recover everything from ibdata in mysql

I lost all my databases files after my hard disk was broken, In a way or another I got ibdata files the size for the file is 4GB.After replacing log files and files and type innodb_force_recovery=6 in ...
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46 views

MySQL/MariaDB: Can I drop KEY declatations in sql dump for CREATE TABLE for foreign keys?

I prepare Liquibase schema creation changelog for legacy DB. I started with SQL dump and refined it by little sed processing so I have only CREATE TABLE statements. It looks like: CREATE TABLE `...
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171 views

Change MySQL stored procedure 'Database Collation' name

I have imported a DB from Local machine to server machine. While importing the Database, the character set values of the DB are set by system default to "Latin". I have changed the character set to "...
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62 views

Modify MySQL information_schema (specially create_time) on AWS RDS?

I am trying to modify the create_time of an entire database, tables, etc. I have found that information_schema tables stores the creation date of the tables on the column CREATE_TIME. Unfortunately ...
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27 views

calling multiple procedures from my application Vs calling procedures inside another procedure

I have a scenario of saving user details into my database(MySQL 5.1); i have three tables for saving user details; user_data,user_contact,user_address, so if i insert one user data i have to check for ...
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17 views

How to find out tables related to a certain query?

I need to copy tables that are included in a certain query from one schema to another schema. I do not want to dump all the tables from the old schema to new one, just the ones only required to get my ...