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• 3 Root accounts in MySQl database

  - by hairbymaurice

  Hello, I have managed to get mySQL running under Ubuntu 8.10, I am now diligently trying to secure the database and am adding passwords for the root users. My question: I have a root user under the host "kickseed" with no password set I have no idea what kickseed is as the database is installed under localhost, on searching around i have discovered that this is something to do with the ubuntu OS itself. Is it safe to delete this user account from MySQL or is it used for something by the OS? If i need to keep it should i /can i protect it with a password? Also i have another root account under the host IP 127.0.0.1 again can i delete this? My absolute preference would be to have only one account with root access but i do not want to delete these accounts if they are necessary. Thanks for tolerating a newbie Regards Hairby

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• How do I troubleshoot mysql and php?

  - by Joshua Moore

  PHP works, mysql works, but when I call mysql_connect, nothing happens. What can I do?

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• problem with mysql and php

  - by Joshua Moore

  PHP works, mysql works, but when I call mysql_connect, nothing happens. What can I do?

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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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• MySQL Unions/Subselects not utilizing keys from associated tables

  - by Brett

  I've noticed by doing EXPLAINs that when a MySQL union between two tables is used, mysql creates a temporary table, but the temp table does not use keys, so queries are slowed considerably. Here is an example: SELECT * FROM ( SELECT `part_number`, `part_manufacturer_clean`, `part_number_clean`, `part_heci`, `part_manufacturer`, `part_description` FROM `new_products` AS `a` UNION SELECT `part` as `part_number`, `manulower` as `part_manufacturer_clean`, `partdeluxe` as `part_number_clean`, `heci` as `part_heci`, `manu` as `part_manufacturer`, `description` as `part_description` FROM `warehouse` AS `b` ) AS `c` WHERE `part_manufacturer_clean` = 'adc' EXPLAIN yields this: id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL (NULL) (NULL) (NULL) (NULL) 17206 Using where 2 DERIVED a ALL (NULL) (NULL) (NULL) (NULL) 17743 3 UNION b ALL (NULL) (NULL) (NULL) (NULL) 5757 (NULL) UNION RESULT <union2,3> ALL (NULL) (NULL) (NULL) (NULL) (NULL) In this case, part_manufacturer_clean and manulower are keys in both tables. When I don't use the subselects and union, and just use one table, everything works fine. I'm not sure if the issue is with the union or with the subselects. Is there any way to union two tables and still use keys/indexes for performance?

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• MySQL ERROR 1045 Access Denied

  - by winarm

  Hello- I recently installed MySQL on Fedora13. Now, when I try to create a database, it denies me access. I tried resetting the password and it does not recognize my system root. I tried resetting password with an init-file containing: UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES; I tried uninstall and then reinstall and it is still not working. I am new to Linux and not comfortable with the filesystem. Talk to me like I'm four. Thank you, kindly.

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• Remote connection to Mysql not working

  - by Fillipe Silva

  We have an application running with CodeIgniter and MySQL in cestacerta.com. Ther are two versions: One that is in production and it works perfectly, and one that is our Development version. This runs locally on my machine and the other developers. The development version needs to remotely connect to the database, and it rather suddenly stopped working. I've given permission to access any IP settings on the server. I can access the database through the MySQL Gui Tools. I have tested access to several different codes, including a newly downloaded version of CodeIgniter and always got the same error: "A Database Error Occurred Unable to connect to your database server using the provided settings. Filename: C: \ xampp \ htdocs \ cestacerta \ system \ database \ DB_driver.php Line Number: 119 " What troubleshooting steps can I take determine if the error is on our workstations (which all have the same error) or on our server.

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• How to Architect a system on AWS for scaling (with a MySQL back-end)

  - by Edan Maor

  I'm trying to understand how to architect an Amazon Web Services application. As I understand it, the whole point of using something like AWS is to make the eventual scaling easier, so I'm trying to understand how to do that. I have an instance, running off of EBS (EBS-based instance, not a regular instance). My application (a Django app) uses MySQL as a back-end. So the question is, where am I supposed to install the MySQL? Do I install it on the same instance? In which case, as far as I can tell, I can't simply create more server instances from that image. Or am I supposed to simply spin up another server as a DB server, and run off of that? Thanks for any help!

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• MySQL cluster: 20Tb x 3K tables

  - by ethrbunny

  Over the next 2-3 years we will be scaling up data collection for a project. As a result the amount of data will grow 10-fold. Our current MySQL installation can keep up with the 2Tb of data but for larger queries there is a fair amount of IOWait. Im investigating a migration to a clustered solution to spread out the IO but am wondering about NDB and what happens to data that doesn't get accessed very often. The impression I get from reading about MySQL cluster is that it relies on memory tables for most of the data. What happens with tables that don't get accessed very often (or at all)? And how does backup work? Can I use MYSQLDUMP or is there a better solution?

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• Mysql Encryption and Key managment

  - by microchasm

  I am developing a local intranet system in PHP/MySQL to manage our client data. It seems that the best practice would be to encrypt the sensitive data on the MYSQL server as it is being entered. I am not clear, though, on what would be the best way to do this while still having the data readily accessible. It seems like a tough question to answer: where is the key(s) stored? How to best protect the key? If the key is stored on each users' machine, how to protect it if the machine is exploited? If the key is exploited, how to change the key? If the key is to be stored in the db, how to protect it there? How would users access it? If anyone could point me in the right direction, or give some tips I'd be very grateful. Thanks.

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• Running MySQL as SYSTEM Service in Windows XP

  - by enesviem

  I have this strange problem where I create a database in MySQL and I need to restart mysqld but I can't seem to do it with info the MySQL docs. Then, I kill it from the Task Manager and I can't restart it. When I look at the process, it is run by the SYSTEM, rather than me. When I run mysqld it starts the process by me, not the SYSTEM. Am I shutting it down incorrectly? IS there a way to start this daemon as the SYSTEM?

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• Ubuntu Server Edition (Jaunty) x64 Segmentation faults in PHP mysql package

  - by Deeksy

  I've been running Jaunty with Apache2, PHP & MySQL running drupal websites as well as python 2.6 and trac on the same server. I'm getting quite a few segmentation faults and suhosin warnings on my drupal websites which don't seem to be related to the amount of RAM the server has (3GB) as the trac site is running happily without issues. The issue seems to be related to PHP accessing mysql and I'm getting suhosin warnings. Has anyone else seen this problem? Any ideas on how to fix it? Funnily enough, it's not a consistent error, as restarts tend to fix the issue temporarily.

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• Create a super user in MySQL 5.5 not working: Permission denied for root@localhost

  - by GHarping

  Using CentOS 6, logged in to MySQL as root, entering the command: create user 'user123' identified by 'pass123'; works fine. But when I try and give that user super user privileges with: grant all on *.* to 'user123' identified by 'pass123'; I get the error: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) Then select * from mysql.user; shows that root has Y in all columns, so should have all privileges. I'd be very grateful if anyone could help me find why root is unable to grant privileges as I can't see why it wouldn't be working. Thanks

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• MySQL returning slow queries with result sets bigger than 30 rows

  - by josephs8

  When ever I run a query that exceeds 30 queries the time for the query to run goes from less than a second to over 10 seconds to get data. Example I run a query to return 29 rows, it takes .1 seconds, I run a query to return 31 rows it takes 11.2 seconds. I am running mySQL on Windows 2008 Server Dual Core 2.6Ghz with 3GB of Memory. The machine doesn't run anything else. It does have a instance of MSSQL running on the server but that does not get used at all. This only happens via PHP right now, If I manually run the query on the server it returns it in less than a second. The queries are not complicated either I have included one below: SELECT Name, Value FROM `bis_co`.`departments` LIMIT 31 What would be causing this issue and how can I correct this? Am I missing a configuration setting in MySQL or something. Thanks

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• Some strange things in the db table of mysql database

  - by 0al0

  I noticed some weird things in the db table of mysql database in a client's server, after having the Mysql service stopping for no reason what are the test, and test_% entries? Why are there two entries for the database AQUA? Why is there a entry with a blank name? Should I worry about any of those? What should I do for each specific case? Is it safe to just delete the ones that should not be there, after backing up?

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• Connect to MySQL trough command line without need root password

  - by ReynierPM

  I'm building a Bash script for some tasks. One of those tasks is create a MySQL DB from within the same bash script. What I'm doing right now is creating two vars: one for store user name and the other for store password. This is the relevant part of my script: MYSQL_USER=root MYSQL_PASS=mypass_goes_here touch /tmp/$PROY.sql && echo "CREATE DATABASE $DB_NAME;" > /tmp/script.sql mysql --user=$MYSQL_USER --password="$MYSQL_PASS" < /tmp/script.sql rm -rf /tmp/script.sql But always get a error saying access denied for user root with NO PASSWORD, what I'm doing wrong? I need to do the same for PostgreSQL, any help? Regards and thanks in advance

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• mysql server, open 'dead' connections

  - by Jeff

  my basic question is what kind of impact does this have on the server.. lets say for example, there is an older program in my company that opens connections to a mysql database server at a high rate (everything they do with the application basically opens a server connections) however, this application was not designed in the way to dispose of the connections after they where created.. alot of the time the connections remain open but are never used again, open 'dead' connections i guess you could say. they just remain connected until the server times them out, or until an admin goes in and removes the sleeping connections manually. im guessing this could be responsible for sometimes not able to connect errors etc. that we receive from other systems that try to access the mysql database? (connections limit reached) could this slow down the server as well? curious what all this could exactly cause. thanks!

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• Other computer can't connect to MySQL Database

  - by user23950

  I have a VB .NET program the uses a MySQL database. It works when the computer that has WAMP installed is the one running the program. The same program now displays an Unhandled Exception error when the computer it's running on does not have WAMP installed (and running). The only thing that is installed is the MySQL connecter net. How can I make this work? I have already tried opening port 20 by configuring the firewall. I did this for both TCP and UDP.

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• mysql is not using multiple cpus

  - by mhost

  Our MySQL server has been using a lot of CPU lately (it's reached 100% several times and stays there for a while) and I noticed that it the CPU load is all on one core of one cpu. I was hoping to spread that out to all 4 on my server. I have been tweaking the MySQL settings to use more ram and less cpu, but it still occasionally reaches very high CPU usage. It seems like everything about the topic refers to thread_concurrency (which I've read is a solaris only setting). What can I do in Linux? Thanks.

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• Backup all plesk MySQL Databases to individual files

  - by Michael

  Hy, Because I'm new to shell scripting I need a hand. I currently backup all mydatabases to a single file, thing that makes the restore preaty hard. The second problem that my MySQL password dosen't work because of a Plesk bug and i get the password from "/etc/psa/.psa.shadow". Here is the code that I use to backup all my databases to a single file. mysqldump -uadmin -p`cat /etc/psa/.psa.shadow` --all-databases | bzip2 -c > /root/21.10.2013.sql.bz2 I found some scripts on the web that backup each database to individual files but I don't know how to make them work for my situation. Here is a example script: for db in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $db | gzip > "/backups/mysqldump-$(hostname)-$db-$(date +%Y-%m-%d-%H.%M.%S).gz"; done Can someone help me make the script above work for my situation? Requirements: Backup each database to individual file using plesk password location.

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• MySQL Replication fix after server shutdown/start

  - by Jagbir

  Server1 is Master Server2 is Slave Both are in our AWS testing env and we stop them once done with our work. When start again, Master rotates/creates new binary log file but slave keep looking for same/existing one and replication stops. Right now, I'm manually repairing it by (slave): stop slave; CHANGE MASTER TO MASTER_HOST='xx', MASTER_USER='xxx', MASTER_PASSWORD='xxx' , MASTER_LOG_FILE='new-mysql-bin.00000x',MASTER_LOG_POS=107; start slave; show slave status\G and slave becomes good again.Mysql is 5.5.x on Ubuntu 12.04. Will appreciate any help in automating it.

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• mysql is not using multiple cpus

  - by helpmhost

  Hi, Our MySQL server has been using a lot of CPU lately (it's reached 100% several times and stays there for a while) and I noticed that it the CPU load is all on one core of one cpu. I was hoping to spread that out to all 4 on my server. I have been tweaking the MySQL settings to use more ram and less cpu, but it still occasionally reaches very high CPU usage. It seems like everything about the topic refers to thread_concurrency (which I've read is a solaris only setting). What can I do in Linux? Thanks.

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• Remove MySQL ibdata1 without dumping and restoring existing proper databases

  - by Halfgaar

  My MySQL server contains two 100+ GB big databases. One was created with innodb_file_per_table and one wasn't. The one that wasn't, has been dumped, ready to be reloaded. However, the ibdata1 file is still huge and I don't have enough free space. Normal advice in this situation is to dump and remove each database, stop MySQL, then remove ibdata1 and the transaction logs, and then reload the databases. My specific question is: can I leave databases that were created with innodb_file_per_table alone? Or will they be destroyed when I remove ibdata1, even though all their files are separate? I can't afford to take this database off-line to dump and reload it. And because it's already properly made with separate files per table, it would feel pretty useless.

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• Why mysql 5.5 slower than 5.1 (linux,using mysqlslap)

  - by Zenofo

  my.cnf (5.5 and 5.1 is the same) : back_log=200 max_connections=512 max_connect_errors=999999 key_buffer=512M max_allowed_packet=8M table_cache=512 sort_buffer=8M read_buffer_size=8M thread_cache=8 thread_concurrency=4 myisam_sort_buffer_size=128M interactive_timeout=28800 wait_timeout=7200 mysql 5.5: ..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000 --iterations=5 -S /tmp/mysql_5.5.sock --engine=innodb Benchmark Running for engine innodb Average number of seconds to run all queries: 15.156 seconds Minimum number of seconds to run all queries: 15.031 seconds Maximum number of seconds to run all queries: 15.296 seconds Number of clients running queries: 10 Average number of queries per client: 500 mysql5.1: ..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000 --iterations=5 -S /tmp/mysql_5.1.sock --engine=innodb Benchmark Running for engine innodb Average number of seconds to run all queries: 13.252 seconds Minimum number of seconds to run all queries: 13.019 seconds Maximum number of seconds to run all queries: 13.480 seconds Number of clients running queries: 10 Average number of queries per client: 500 Why mysql 5.5 slower than 5.1 ? BTW:I'm tried mysql5.5/bin/mysqlslap and mysql5.1/bin/mysqlslap,result is the same

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• I Cannot connect to remote MySQL database using SSH tunnel

  - by Scott

  Brand new server, brand new MySQL 5.5 install on Ubuntu 12.04. I can log in to the database as root from the command line. I can log on via Navicat MySQL or Sequel Pro as root on port 3306 from my Mac. I cannot log in using an SSH tunnel to the server and then to the database as root. I have tried both localhost and 127.0.0.1 as server for the local connection part. My password is fine. root is currently defined at %, 127.0.0.1, and localhost. I have set up this same type of connection at least 30 times before and never had a problem. The SSH connection gets made with no problem, and then it just hangs trying to connect to the DB and finally times out. The only thing I changed in my.cnf was to comment out the bind-address = 127.0.0.1 line. Any help? Any Ideas?

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