MySQL : Open-Source, Relational Database Management System

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MySql Innodb corruption recovery

I have a MySql database, just containing Innodb tables, that seems to have corrupted itself. It replicates to another server and it has corrupted that one too! The symptom is that I can restart the ...
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3answers
13k views

How to easily convert utf8 tables to utf8mb4 in MySQL 5.5

I have a database which now needs to support 4 byte characters (Chinese). Luckily I already have MySQL 5.5 in production. So I would just like to make all collations which are utf8_bin to ...
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2answers
30 views

Finding two users with same pair group

I have the following table which details actions of users and the action's parameters: action_id(auto-increment) | user_id | action_name | action_attr1 I want to find which users performed the same ...
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1answer
119 views

my.ini configuration for a huge server

I have developed a web based app in PHP MySQL and Flash Builder. It was running fine until a few days ago when the client began to connect a lot of users. Then the app started to freeze and sent ...
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1answer
191 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
360 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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1answer
230 views

Not able to update MySQL table using Oracle: Unknown column in 'where clause' {42S22,NativeErr = 1054}

I have the following tables: MySQL table: jti_member_interact CREATE TABLE `jti_member_interact` ( `INT_MEMBER_ID` int(11) NOT NULL, `INT_ID` int(11) NOT NULL AUTO_INCREMENT, `INT_SOURCE` ...
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1answer
468 views

Multiple product attribute inventory database design

I have a database to build based on inventory for my shop. This is the current data that I have put into tables. This is the package: This is the product attribute: This is the table ...
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2answers
156 views

MySQL login after secure installation

I have installed mysql5.5 via secure installation procedure by using: sudo mysql_secure_installation Now when I am trying to login in MySQL from the terminal by using: sudo -u root -p The ...
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2answers
2k views

Updatiing a column after expiration of specific time in MySQL

I have a table where I have a column named state(int(2)) and modify_time (time_stamp on update current timestamp). I have an update trigger which changes the value of state column to 0 based on some ...
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14 views

Moved a MySQL Database to another server, but socket keeps pointing to localhost

I know I shouldn't bother with this, maybe I should disable the old mysql, but this is a Magento virtual appliance from Bitnami thats work as a whole (application and database on the same server). I ...
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1answer
37 views

Fast alternative for “NOT IN”

I have a table A that got a field called id that is the primary key of this table. I also have a table called B which also have a field called id as primary key. Now I want to get all rows from ...
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1answer
22 views

Data and index file compatibility between patch/revision releases of MySQL

Let's say a server is on MySQL 5.6.1234 (yes I know that number's made up) and gets updated to 5.6.1235 (so an increment in revision / patch number). How safe would it be roll back MySQL to 5.6.1234 ...
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1answer
367 views

InnoDB forum DB design and Composite Primary Key (Cluster Primary Key)

I am designing forum database using InnoDB and got few questions , Could any one please help me to clarify them? Posts and Comments table design below CREATE TABLE `my_posts` ( `forum_id` ...
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54 views
+50

MySQL log tables design

I have to make 25 modification historic tables from 26 tables. I need a design for each table that could grow more than 75,000,000 of rows. I use InnoDB for 25 tables and 1 with MyISAM. I have one ...
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1answer
215 views

Speeding up a simple select query on Mariadb

I have a 100k rows table with the following structure: +----------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | ...
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32 views

I need to find the “rank” in a sub-set of entries

I am currently working on some sort of a highscore list. But values displayed are individual for each user, ie. limited by constraints. One constraint that I am currently working on is "being part of ...
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3answers
18k views

1286 - Unknown storage engine 'InnoDB'

I am trying to use roundcube and it recently just broke. I don't know if this is due to a MySQL update that happened recently or not but in phpMyAdmin I get the following error if I try and view a ...
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1answer
33 views

MySQL query WHERE IN + ORDER BY, which EXPLAIN is better and how to avoid filesort?

This is my table definition, without any special index for now: CREATE TABLE `filter` ( `field_name` varchar(32) COLLATE utf8_unicode_ci NOT NULL, `category_id` varchar(32) COLLATE ...
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1answer
31 views

What is the correct implementation of handling concurrent SQL inserts while ensuring a non-primary key column (i.e. wid) unique and auto-incremental?

What is the correct implementation of handling concurrent SQL inserts while ensuring a non-primary key column (i.e. wid) unique and auto-incremental? Note: There was a design constraint that led this ...
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0answers
24 views

Can MySQL Enterprise Edition be used for free with no time restriction? [on hold]

My question is about product licensing by Oracle, specifically about MySQL Enterprise Edition licensing. I am not any DBA Master, I'm just a developer in search for answers from the real experts. ...
4
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1answer
328 views

Storing history of full/partial tables

I'm building a web-application with Django and MySQL (InnoDB) and am currently pondering over how to manage historical changes on various tables. I wonder if it's efficient to store a lot of rows ...
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2answers
2k views

Mysql Server Login and Permission Deny Error

I have a problem with MySQL server. After upgrading MySQL server from 5.3 to 5.4, I am not able to log-in using my MySQL root password (Yes, I am able to log-in without password!). Also not able to ...
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1answer
198 views

Accuracy of mysqldbcompare vs other tools like pt-table-checksum

I was curious to hear what everyone's experiences are with using mysqldbcompare vs pt-table-checksum( from Percona Toolkit ) to find the differences between two MySQL databases. I have heard that ...
5
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1answer
351 views

Deadlock free MERGE-alike in MySQL?

I am trying to implement some parts of MERGE in the MySQL driver in Drupal. Of course, Drupal has something but in truth it only works because the most frequent MERGE issuer just eats exceptions. So, ...
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23 views

MySQL Workbench cloud alternatives [on hold]

I have some analyst who runs some particular queries which are provided by me. Now when a new analyst joins our team I have to install MySQL Workbench on their laptop to set up the connection. I went ...
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1answer
707 views

INSERT take too much time

I have in my MySQL DB a few tables Most of the time, I'm only doing INSERT in my db. I have up to 4 connections to the DB, each one inserting into a different table. There cannot be two connections ...
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1answer
163 views

How to track only DDL statements executed in MySQL

Can we track only executed DDL statements in MySQL but not DML statements. I dont want to use either binlog/general log to enable. I just wanted to track only DDL statements. I had gone through the ...
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2answers
2k views

mysql.sock not found on CentOS 7 machine

I am getting the following error when I try to log into mysql from the CentOS 7 terminal of the machine where mysql is installed: ERROR 2002 (HY000): Can't connect to local MySQL server through ...
2
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1answer
171 views

SELECT performance on MariaDB Galera cluster vs. MariaDB is terrible

We are evaluating a Galera setup and so far we have not noticed to many drawbacks except a few queries that have terrible READ performance I cannot put my finger on it. The query by itself isn't ...
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1answer
34 views

Is it necessary to create foreign key in this query? [on hold]

I have the table called investors having as primary key the column id. I have the tables Users, Login_Logs and Accounts. All of these tables contains the foreign key investor_id. Between investor and ...
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25 views

optimizing a wild card search query in mysql

I want to have a search option in my game portal site. (right now i'm using google's in site search) I want a user to search to enter a search term and need my query to search the search term in the ...
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28 views

Master/Slave and Master/Master replication - MySQL

What is the difference between having a master-slave replication and having a master-master( where in the second master acting as hot-standby - active-passive) replication? Also, what are the issues ...
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2answers
1k views

How much data is needed to show MySQL Cluster's performance scaling vs. InnoDB

I am evaluating MySQL Cluster as a possible replacement for an InnoDB schema. So far, I have tested it with 10s of MB of data, and found MySQL Cluster slower than InnoDB; however, I have been told ...
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2answers
39 views

mysqldump error on common_schema

I tried to take the backup of common_schema in Server version: 5.5.44 MySQL Community Server (GPL). mysqldump -u root -p common_schema > common_schema_bkup.sql I got the following error: ...
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1answer
276 views

pt-table-checksum - Verify MySQL replication integrity

export/import: $ mysqldump -h6dhdbm01 -p clee2 users > 6dhdbm01-clee2.users.sql Enter password: $ echo $? 0 $ mysql clee2 < 6dhdbm01-clee2.users.sql $ echo $? 0 $ pt-table-checksum: $ ...
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1answer
637 views

MySQL General error: 126 Incorrect key file for table '/tmp/#sql_27e6_0.MYI'; try to repair it'

I have a table in MySQL with ~2,000,000 rows. When I try to select all records, it exhausts the system's memory and I get an error about memory exhaustion back. When I try to use the MySQL LIMIT and ...
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1answer
15 views

Is my import still committing?

I'm importing around 9 million rows into my MySQL DB using the following command: SET autocommit=0; SOURCE my_import.sql; COMMIT; The command line is no longer outputting lines of Query OK, X rows ...
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1answer
322 views

How to automatically Reset Query Cache for improve table cache hit in MySQL?

I have a VPS running CentOS 6.4 and 2.5GB RAM, Intel(R) Xeon(R) CPU. Its MySQL version is Server version: 5.5.35-cell. I have two active wordpress sites and two inactive sites (inactive sites use for ...
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1answer
24 views

How to do an efficient case insensitive search

As an example, take a city table with 2 columns city_ref (bigint) city_name (varchar) with indexes on both. I want to do a case independent search by city_name. I know I can use like but ...
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1answer
25 views

what is problem with time field in mysql during insert or update time? [on hold]

I have created a time field in MySQL. During INSERT or on UPDATE, if I don't select the time then the time field gets a default value of 12AM. However, I want to set this time field to NULL by ...
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2answers
2k views

Improve MySQL Query Performance - Too many records

I am using MySQL RDMS for a contact management system. Now a days my database grew in size and contains more than 1 million records. Checking duplicate phone numbers became a big issue during ...
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0answers
21 views

Operation failed with exitcode 1 - while importing from a dump folder

I'm new to dbs and I'm trying to learn how a certain db works. They gave me a dump folder to play with it but, after setting up a connection (works), while trying to import, I get this annoying ...
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1answer
1k views

How can I get Performance Statistics to work in MySQL Workbench?

I have a complex query that is performing in subsecond time on my laptop, while the same query takes 70 seconds on my production server under no load against an identical schema. The EXPLAIN plan is ...
0
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1answer
19 views

MySQL ERROR 2013 Lost connection

I am running a real old version of mysql(3.23.56). Everything is good, expect when I want to delete all entries of a table. I have checked query, like drop, select,update, their behaviours are ...
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3answers
41 views

Use “NOT IN” in the same table, Mysql

I have a table like that: table1 +----+------+--------------+ | id | name | phone_number | +----+------+--------------+ | 1 | A | 111111111111 | +----+------+--------------+ ...
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1answer
783 views

SQL set profiling

I'm setting up an automatic database backup for a website. When I try to do a backup it comes up with the error" MySQL error: The 'SHOW PROFILE' feature is disabled; you need MySQL built with ...
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1answer
259 views

MySQL Entity Relationship Problem - 3-way join table?

This is a db relationship question. I have a scenario which I believe I have come up with a solution - however, I can't be sure it's a manageable one, or even correct. The scenario is as follows: ...
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22 views

Migrating tables from SQL Server to MySQL

I am using MySQL Migration Wizard to copy some tables from SQL server to MySQL local instance. When I define the source and target connection and test them I get a Connection Successful message and ...
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0answers
21 views

MySQL/Eloquent belongsToMany relation - two tables same pivot table allowed? [migrated]

Is it allowed to have two tables, each with a belongsToMany() relation to each other, using the same pivot table? Here is my User table: And here is my Org table: And here is the pivot table: ...