MySQL : Open-Source, Relational Database Management System

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Is it possible to ADD 2 EER model from 2 differents database in the same editor screen in MySQL Workbench?

I am using MySQL workbench to visualize a EER model form one database, lets says db1. It is a 166 tables database. Then I have another database, that interacts with db1, that has 10 tables. So I have ...
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2answers
794 views

Designing database with Category and Tags for Posts - Seeking for guidance/advice

I'm not really a database novice but I'm not an expert either. Problem: I'm having this difficulty on designing my Post, Category and Tags relationship. I've read Normalization many times but could ...
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2answers
191 views

mysql need help optimizing query

I have a table containing servers logs, and another table containing rules to match certain and drop them. The logs tables contains around 1 million rows, and there are about 20-30 rules. The ...
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1answer
13 views

GROUP BY parentId and MAX childId

My tables are below: crm_conversions crm_messages_of_conversions crm_receivers_of_messages I want to get all of conversions of an user with only last message. I'm trying to get with the query: ...
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3answers
429 views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
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19 views

difference between phpmyadmin and php PDO

I'm running a query in Phpmyadmin and also execute the same query with php PDO but results are not equal. What could be wrong ? This is query : SELECT dim_date_key as date ,dim_jdate_key as jdate, ...
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1answer
27 views

MySQL does not generating PID file

I upgraded my OS from redhat 2.6.3 to 2.6.5 after that when I restarted my MySQL server but it not started, error message is "150320 11:53:17 [ERROR] Error message file ...
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2k views

MySQL - high CPU usage (MyISAM tables)

We have a server running LAMP stack on CentOS release 5.6 (Final) MySQL is having high CPU usage constantly which causes server to lag as shown top - 13:50:47 up 80 days, 13:53, 1 user, load ...
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2answers
886 views

What should be done before upgrading MySQL?

I need to perform an upgrade of MySQL on my web server. There could be many users connected to the server at any time, performing queries or updates on the database, or uploading files to the server. ...
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1answer
169 views

How to get names form 3 different tables

I have 4 tables to proceed. In table A I have the parameters of columns in tables B,C,D and the names are there. TB_A ...
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2answers
24 views

how to display parent items with thier child items in mysql data base

i am using my sql data base i have table with following data and table name is account id name parent-id 1 aaa null 2 bbb 1 3 ccc 2 4 ...
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8 views

enabling mysql event scheduler on godaddy [on hold]

Does anyone know if this is possible on shared hosting setups like godaddy? The tech support didn't understand the question when I rang them. I get an error about me requiring super user privileges ...
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199 views

MySQL is using wrong index

This is my table: - user_id INT (foreign key on `user` with the reference `id`) - question_id INT (foreign key on `question` with the reference `id`) - option_id INT (foreign key on `option` with the ...
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1answer
293 views

xenforo vulnerability, limit max open connections by ip address

Trying to get some emergency help because my website is being attacked. It isn't as much as an actual attack, as it is a small bot to exploit xenforo vulnerability. ...
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0answers
15 views

data calling from one page to another? [migrated]

Hey guys i have a question. I am trying to set up something for my insurance website. I want to setup a capture page where the user inputs everything related to their vehicle and their information and ...
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1answer
79 views

MySQL hang during “show collation” on Amazon RDS

MySQL is hanging when I try to do SHOW COLLATION on my Amazon RDS instance. I can use SHOW COLLATION fine with my local database, and other SQL commands work fine on my RDS instance. But Amazon SHOW ...
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2answers
97 views

Query to Access a specfic data in the row using python

Am using wordpress and phpmyadmin for handling my database Below is the code I use to view entries on my form using python. In the form I ask users to check/uncheck specific questions. It works as ...
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1answer
9 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
13 views

MySQL not using optimum composite key [on hold]

I have a table which I've added a couple of composite keys to: CREATE INDEX idx_foo on my_table(col_one, col_two, col_three); CREATE INDEX idx_bar on my_table(col_one, col_four, col_three); Why, ...
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1answer
32 views

Maximum possible memory usage: 23.6G (785% of installed RAM)

I have a virtualized 32bits Server for Mysql (RAM : 115 Go). I am trying to optimize with mysqltuner and I get this : >> MySQLTuner 1.1.1 - Major Hayden <major@mhtx.net> >> Bug ...
2
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1answer
553 views

Why would the size of MySQL MyISAM table indexes (aka MYI file) not match after mysqldump import?

I've been archiving some MySQL (version 5.0.96) MyISAM tables locally and deleting from my server after checking the data. Every time the process has been pretty similar and comes off mostly without a ...
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1answer
455 views

MySQL server: Unable to connect with root because of skip-name-resolve option

We had our MySQL server on an old server. We decided to move all of the databases to our new server. Old MySQL Server engine 5.5.31 New MySQL Server engine 5.5.38 We created one general dump file ...
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5answers
15k views

Fastest way to check if InnoDB table has changed

My application is very database intensive. Currently, I'm running MySQL 5.5.19 and using MyISAM, but I'm in the process of migrating to InnoDB. The only problem left is checksum performance. My ...
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1answer
18 views

Are there any risks in running 'flush hosts'?

Due to an error in my code I got my PC blocked from an active production DB (too many connection errors). The error calls for me to use 'flush hosts' in order to reset the host cache. Are there any ...
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135 views

#1093 - You can't specify target table 'R' for update in FROM clause

As an attempt to answer Difference data between adjacent rows UPDATE Visits R SET Duration = TIMEDIFF( ( SELECT ReqTime FROM Visits N WHERE N.ID > R.ID AND N.Session=R.Session ORDER BY ID ...
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1answer
17 views

Restore of db's on local locks me out of accessing other sites

Running my local dev websites on my Mac locally and when I am restoring a database via terminal, which the restore is running I cannot access anything that uses mysql, I get a broken pipe notice. Is ...
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2answers
36 views

User, host, and privileges

In a MySQL 5.6 database I found one user 'foo'@'10.0.0.2' with ALL PRIVILEGES. I also discovered an user 'foo'@'10.0.0.3' granted only USAGE privileges. Does this second user definition make sense? ...
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20 views

Restore from mysqlbackup not showing tables

I have searched but can't find an answer to this question. I tried following the directions of creating a new slave from MySQL using mysqlbackup. The backup seemed to go fine, and I had a fresh ...
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1answer
70 views

Most efficient way to set up a database handling millions of links? [on hold]

I'm looking at making a site that will potentially have up to a million users, and each user will have hundreds/thousands of links connected to a set of sites, as well as other info. I'm using mysql ...
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1answer
139 views

NDB Cluster seems to ignore foreign_key_checks=OFF

According to MySQL documentation on the local foreign_key_checks variable Beginning with MySQL Cluster NDB 7.3.2, setting this variable has the same effect on NDB tables as it does for InnoDB ...
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2answers
5k views

MySQL shutdown unexpectedly

2013-09-09 10:21:44 5776 [Note] Plugin 'FEDERATED' is disabled. 2013-09-09 10:21:44 1624 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future ...
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3answers
4k views

What is the best way to recover from a mysql replication fail?

Today, the replication between our master mysql db server and the two replication servers dropped. I have a procedure here which was written a long time ago and i'm not sure it's the fastest method to ...
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2answers
4k views

How to force higher values of open_files_limit or table_open_cache?

I'm having a frustrating problem where setting my.cnf to values higher than I currently have them does not 'take'. This is MySQL 5.6.14 on MacOS X 10.8.3 I'm trying to address dropped connections ...
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1answer
8 views

Replication Issue - Changing the replication-do-db filter

I have a server that someone has setup which are acting as a master on both database. Since they have been configured as both master on the same database, changes one on end has caused all sorts of ...
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1answer
157 views

Query multiple rooms with different conditionals (Adults, Children)

I have a simple query where I select available x Rooms with x Adults + x Children per hotel that matches a date range, but I'm having a hard time trying to figure out how to query a list of rooms per ...
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3answers
207 views

How to solve multidimensional data relationship

I'm having a problem, that I could solve programmatically, but for my personal (test) project I'm trying to see if I can fix it in the relational model. Imagine a complex fashion product Pants with ...
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1answer
718 views

Slow insert with MySQL full-text index

I use a full-text index in a MySQL table, and each insert into this table takes about 3 seconds. It seems that MySQL rebuilds (a part) of the full text index after each insert/update. Is this right? ...
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1answer
552 views

How to normalize my db schema for a quiz application?

I am putting together a quiz application. (I'm calling each quiz a "challenge") I have a "challenge" table and a "challenge_question" table which is pretty straightforward. challenge table: id ...
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1answer
40 views

Alias of Subquery not working

I have been trying to get an order by to work correctly with an aggregate function. i.e. order by (bp + points) I also try adding these as a total amount from the following query however. If I try ...
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1answer
1k views

MySQL SELECT query hangs - Opening Tables INNODB

On my server I have 6 MySQL databases. They all power Wordpress websites. For some reason, 2 of these databases are not accessible. To my knowledge they use INNODB, but I can't confirm it as even ...
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2answers
23 views

Slow database drop in mysql

Just installed a new 24 core server and it is noticeably slower when doing truncates and drops. Example: $ mysql -u root lmcdental_test2 Reading table information for completion of table and column ...
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2answers
1k views

ERROR 1166 (42000) at line 65203: Incorrect column name ''

I have a big snapshot database size is about 44GB in mydata.sql. When I run it overnight, it show this error message: $ mysql -u root < mydata.sql ERROR 1166 (42000) at line 65203: Incorrect ...
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1answer
15 views

I have a DB that is locking up from numerous updates to a table: Should I convert it from MyISAM to InnoDB?

FYI: I don't believe this is a duplicate question, I've looked and most are general questions with vague answers. See more specifics below: Currently a database I am in charge of locks up every once ...
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0answers
13 views

Does MySQL Backup Restore affect Master-Master Replication

Hello I got some problems with a MySQL shemas and it seems that the schemas got deleted for an unknown reason. I try to find in the binlog for more information of this but I didn't find the way to see ...
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1answer
3k views

MySQL: Lock wait timeout exceeded

I have a developer that has been trying to alter a large table (~60M rows). Via LiquidBase/JDBC they're running ALTER TABLE foo DROP FOREIGN KEY fk_foo_1; Today while it was running I checked in ...
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MySQL Replication 2003 error connecting (servers behind monowalls)

I'm trying to get MySQL replication, Master-Slave, configuration working. On my slave when I do a SHOW SLAVE STATUS\G; I get a 2003 error: Last_IO_Errno: 2003 Last_IO_Error: error connecting to ...
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38 views

Percona Master-Master lag issues

I have 2 servers with master-master replication using Percona MySQL 5.6 and I am having replication lag in the second server: db-02, however db-01 never had a lag situation. What could be causing ...
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1answer
198 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
411 views

Alter mysql database engine doesn't work from cluster to other

I got into this issue when I tried to alter my database table engine to InnoDB from ndbcluster, It did not work. But When I changed engine from InnoDB to ndbcluster it worked. It did not throw any ...
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1answer
37 views

CONCURRENT SELECT's SLOW … LOCK IN SHARE MODE

My Table has 25 Million rows total and 6 million rows satisfying below where clause. Select 1: select max(stamp) from Table where type = "string" LOCK IN SHARE MODE ; 6000+ seconds Select 2: ...