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  • General logging won't work in MySQL

    - by leonstr
    I saw on SF that there's an option in MySQL to log all queries. So, in my version (mysql-server-5.0.45-7.el5 on CentOS 5.2) this appears to be a case of enabling the 'log' option, so I edited /etc/my.cnf to add this: [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql old_passwords= log=/var/log/mysql-general.log [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I then created the file and set permissions: # touch /var/log/mysql-general.log # chown mysql. /var/log/mysql-general.log # ls -l /var/log/mysql-general.log -rw-r--r-- 1 mysql mysql 0 Jan 18 15:22 /var/log/mysql-general.log But when I start mysqld I get: 120118 15:24:18 mysqld started ^G/usr/libexec/mysqld: File '/var/log/mysql-general.log' not found (Errcode: 13) 120118 15:24:18 [ERROR] Could not use /var/log/mysql-general.log for logging (error 13). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it. 120118 15:24:18 InnoDB: Started; log sequence number 0 182917764 120118 15:24:18 [Note] /usr/libexec/mysqld: ready for connections. Can anyone suggest why this isn't working?

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  • Segmentation fault on login to mysql

    - by numberwhun
    Hello everyone! I recently did a fresh install of Ubuntu on my laptop (HP dv7, AMD Dual Core with 4 gigs RAM). I am working on installing my development environment and tools and one of the first things I was working on is getting MySQL installed. The following was my configure statement with options: ./configure --prefix=/usr/local/mysql --with-big-tables --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock --with-named-curses-libs=/lib/libncurses.so.5.7 After I did the make;make install, I did the post configuration such as setting the root password and installing the mysqld daemon in its rightful place. My issue is when I try to log in to mysql to start using it, the following shows what happens: $ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.1.42 Source distribution Segmentation fault I have searched Google extensively, I have searched through the mysql bugs database and I have yet to find anything that matches my issue. Here is the contents of my my.cnf file, in case you want to see it: $ cat /etc/my.cnf [mysqld] basedir=/usr/local/mysql datadir=/usr/local/mysql socket=/usr/local/mysql/tmp/mysql.sock [mysql.server] user=mysql #basedir=/var/lib [client] socket=/usr/local/mysql/tmp/mysql.sock [mysqld_safe] err-log=/usr/local/mysql/logs/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I am really hoping that someone here can tell me what has gone wrong with my installation as I would really love to know. I welcome and look forward to all responses. Thank you in advance! Best regards, Jeff

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  • Installing MySQL 5.1 on OS X 10.7 Lion

    - by xisal
    I am trying to install MySQL 5.1. I am on Lion, and when I remove all files associated with MySQL on my machine it still tells me that I have a newer version installed when I try to install it from the DMG file. Has anyone successfully installed MySQL 5.1 on Lion? I found a solution using Homebrew: Completely remove MySQL from your system (just in case) sudo rm /usr/local/mysql sudo rm -rf /usr/local/mysql* sudo rm -rf /Library/StartupItems/MySQLCOM sudo rm -rf /Library/PreferencePanes/My* vim /etc/hostconfig and removed the line MYSQLCOM=-YES- rm -rf ~/Library/PreferencePanes/My* sudo rm -rf /Library/Receipts/mysql* sudo rm -rf /Library/Receipts/MySQL* sudo rm -rf /var/db/receipts/com.mysql.* Source:http://stackoverflow.com/questions/1436425/how-do-you-uninstall-mysql-from-mac-os-x Install homebrew /usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)" Source: https://github.com/mxcl/homebrew/wiki/installation Install MySQL 5.1 via brew brew install mysql51 if that doesn't work, do this: brew install https://raw.github.com/adamv/homebrew-alt/master/versions/mysql51.rb Source: http://stackoverflow.com/questions/4359131/brew-install-mysql-on-mac-os/6399627#6399627 Make MySQL Work Create mysql.sock file touch /tmp/mysql.sock Install MySQL default tables /usr/local/Cellar/mysql51/5.1.58/bin/mysql_install_db ...or your path Source: http://stackoverflow.com/questions/4788381/getting-cant-connect-through-socket-tmp-mysql-when-installing-mysql-on-ma/5140849#5140849

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  • Webserver: chrooted PHP gives mysql.sock error when attempting to reach mysql

    - by Jon L.
    Hey guys, I've configured an Ubuntu webserver with Nginx + PHP5-FPM. I've created a chrooted environment (using jailkit) that I'm tossing my developers into, from where they can develop their test applications. Chroot jail: /home/jail Nginx and PHP5-FPM run outside the chroot, but are configured to function with websites within the chrooted environment. So far, Nginx and PHP5-FPM are serving up files without issue, except for the following: When attempting to connect to MySQL, we receive this error: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' Now, I believe the issue is due to the non-chrooted php.ini referencing mysqld.sock outside of the chroot environment (it's actually using the MySQL default setting currently). My question is, how can I configure PHP to access MySQL via loopback or similar? (Found that as a suggestion in a google result, but without any instructions) Or if I'm missing some other obvious setting, let me know. If there's an option of creating a hardlink (that would remain available even if mysql is restarted), that would be handy as well.

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  • Installing MySQL 5.5 manually on Ubuntu 10.04 server, errors about "/tmp/mysql.sock"

    - by black sensei
    I've set up an Ubuntu server and wanted to install MySQL 5.5. I've been following these MySQL documentation steps. I have libaio dev installed. Everything went fine until I ran bin/mysqld_safe --user=mysql & It runs into an issue and never returns to the shell. The output of mysqld_safe is logging to /usr/local/mysql/data/host_name.err. When I checked that file, it was complaining about /tmp/mysql.sock. I can unfortunately describe just parts of the error, since before I started right now it deleted all the files I've started installing back then by mistake. Should I change the socket to /var/run/mysqld/mysqld.socket after copying the .cnf file to /etc? I've also checked the /var/run/mysqld directory and there is no mysqld.socket. How do I proceed? Thanks for reading this and helping out

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  • generic Mysql stored procedure

    - by psu
    Hi, I have the fallowing stored procedure: CREATE PROCEDURE `get`(IN tb VARCHAR(50), IN id INTEGER) BEGIN SELECT * FROM tb WHERE Indx = id; END// When I call get(user,1) I get the following: ERROR 1054 (42S22): Unknown column 'user' in 'field list'

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  • create procedure fails!?

    - by Mark
    Hi, when trying to create a simple procedure in mysql 5.1.47-community it fails everytime i've tried everything! even simple things like this! DELIMITER // CREATE PROCEDURE two () begin SELECT 1+1; end; //

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  • Creating temporary tables in MySQL Stored Procedure

    - by burntblark
    The following procedure gives me an error when I invoke it using the CALL statement: CREATE DEFINER=`user`@`localhost` PROCEDURE `emp_performance`(id VARCHAR(10)) BEGIN DROP TABLE IF EXISTS performance; CREATE TABLE performance AS SELECT time_in, time_out, day FROM attendance WHERE employee_id = id; END The error says "Unknown table 'performance' ". This is my first time actually using stored procedures and I got my sources from Google. I just cant figure out what I am doing wrong.

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  • MySql returning multiple rows from stored procedure / function

    - by pistacchio
    Hi, I need to make a stored procedure or function that returns a set of rows. I've noted that in a stored procedure i can SELECT * FROM table with success. If i fetch rows in a loop and SELECT something, something_other FROM table once per loop execution, I only get one single result. What I need to do is looping, doing some calculations and returning a rowset. What's the best way to do this? A temporary table? Stored functions? Any help appreciated.

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  • Oracle Tutor: Learn Tutor in the comfort of your own home or office

    - by emily.chorba(at)oracle.com
    The primary challenge for companies faced with documenting policies and procedures is to realize that they can do this documentation in-house, with existing resources, using Oracle Tutor. Procedure documentation is a critical success component for supporting corporate governance or other regulatory compliance initiatives and when implementing or upgrading to a new business application. There are over 1000 Oracle Tutor customers worldwide that have used Tutor to create, distribute, and maintain their business procedures. This is easily accomplished because of Tutor's: Ease of use by those who have to write procedures (Microsoft Word based authoring) Ease of company-wide implementation (complex document management activities are centralized) Ease of use by workers who have to follow the procedures (play script format)Ease of access by remote workers (web-enabled) Oracle University is offering Live Virtual Tutor classes! The class lasts four days, starts on Tuesday and finishes on Friday. This course is an introduction to the Oracle Tutor suite of products. It focuses on the Policy and Procedure writing feature set of the Tutor applications. Participants will learn about writing procedures and maintaining these particular process document types, all using the Tutor method. The next three classes are scheduled for: April 19 - 22 May 31 - June 3 July 5 - 8 You will learn to: Write procedures Create procedure Flowcharts Write support documents Create Impact Analysis Reports Create Role-base Employee Manuals Deploy online Employee Manuals on an Intranet Enjoy learning Tutor in your local environment. Start the sign up process from this link Learn More For more information about Tutor, visit Oracle.com or the Tutor Blog. Post your questions at the Tutor Forum. Emily Chorba Principle Product Manager Oracle Tutor & BPM

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  • Warning and error information in stored procedures revisited

    - by user13334359
    Originally way to handle warnings and errors in MySQL stored routine was designed as follows: if warning was generated during stored routine execution which has a handler for such a warning/error, MySQL remembered the handler, ignored the warning and continued execution after routine is executed MySQL checked if there is a remembered handler and activated if any This logic was not ideal and causes several problems, particularly: it was not possible to choose right handler for an instruction which generated several warnings or errors, because only first one was chosen handling conditions in current scope messed with conditions in different there were no generated warning/errors in Diagnostic Area that is against SQL Standard. First try to fix this was done in version 5.5. Patch left Diagnostic Area intact after stored routine execution, but cleared it in the beginning of each statement which can generate warnings or to work with tables. Diagnostic Area checked after stored routine execution.This patch solved issue with order of condition handlers, but lead to new issues. Most popular was that outer stored routine could see warnings which should be already handled by handler inside inner stored routine, although latest has handler. I even had to wrote a blog post about it.And now I am happy to announce this behaviour changed third time.Since version 5.6 Diagnostic Area cleared after instruction leaves its handler.This lead to that only one handler will see condition it is supposed to proceed and in proper order. All past problems are solved.I am happy that my old blog post describing weird behaviour in version 5.5 is not true any more.

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  • using a stored procedure for login in c#

    - by Jin Yim
    Hi all, If I run a store procedure with two parameter values (admin, admin) (parameters : admin, admin) I get the following message : Session_UID User_Group_Name Sys_User_Name NULLAdministratorsNTMSAdmin No rows affected. (1 row(s) returned) @RETURN_VALUE = 0 Finished running [dbo].[p_SYS_Login]. -- To get the same message in c# I used the code following : string strConnection = Settings.Default.ConnectionString; using (SqlConnection conn = new SqlConnection(strConnection)) { using (SqlCommand cmd = new SqlCommand()) { SqlDataReader rdr = null; cmd.Connection = conn; cmd.CommandText = "p_SYS_Login"; cmd.CommandType = CommandType.StoredProcedure; SqlParameter paramReturnValue = new SqlParameter(); paramReturnValue.ParameterName = "@RETURN_VALUE"; paramReturnValue.SqlDbType = SqlDbType.Int; paramReturnValue.SourceColumn = null; paramReturnValue.Direction = ParameterDirection.ReturnValue; cmd.Parameters.Add(paramReturnValue); cmd.Parameters.Add(paramGroupName); cmd.Parameters.Add(paramUserName); cmd.Parameters.AddWithValue("@Sys_Login", "admin"); cmd.Parameters.AddWithValue("@Sys_Password", "admin"); try { conn.Open(); rdr = cmd.ExecuteReader(); string test = (string)cmd.Parameters["@RETURN_VALUE"].Value; while (rdr.Read()) { Console.WriteLine("test : " + rdr[0]); } } catch (Exception ex) { string message = ex.Message; string caption = "MAVIS Exception"; MessageBoxButtons buttons = MessageBoxButtons.OK; MessageBox.Show( message, caption, buttons, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1); } finally { cmd.Dispose(); conn.Close(); } } } but I get nothing in SqlDataReader rdr ; is there something I am missing ? Thanks

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  • mysql-python on Snow Leopard with MySQL 64-bit

    - by Derek Reynolds
    Can't seem to get mysql-python to work on Snow Leopard for the life of me. Currently using the default version of python that ships with Snow Leopard (python 2.6.1). Installed MySQL 5.1.45 x86_64. I download the source for mysql-python http://sourceforge.net/projects/mysql-python/ and compile with the following commands: tar xzf MySQL-python-1.2.3c1.tar.gz cd MySQL-python-1.2.3c1 ARCHFLAGS='-arch x86_64' python setup.py build ARCHFLAGS='-arch x86_64' python setup.py install And am getting the following error when I try to import: Python 2.6.1 (r261:67515, Jul 7 2009, 23:51:51) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import MySQLdb Traceback (most recent call last): File "<stdin>", line 1, in <module> File "build/bdist.macosx-10.6-universal/egg/MySQLdb/__init__.py", line 19, in <module> File "build/bdist.macosx-10.6-universal/egg/_mysql.py", line 7, in <module> File "build/bdist.macosx-10.6-universal/egg/_mysql.py", line 6, in __bootstrap__ ImportError: dlopen(/Users/derek/.python-eggs/MySQL_python-1.2.3c1-py2.6-macosx-10.6-universal.egg-tmp/_mysql.so, 2): no suitable image found. Did find: /Users/derek/.python-eggs/MySQL_python-1.2.3c1-py2.6-macosx-10.6-universal.egg-tmp/_mysql.so: mach-o, but wrong architecture Any ideas? Or the best route for starting over.

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  • MS SQL to MySQL using MySQL Migration Toolkit: permission issue

    - by Zeno
    I have a MS SQL imported into SQL Server 2008 from a .bak and I set it to Mixed mode. I have a SQL user (called "test") that can correctly access the database using SQL Server. I need to convert this to a MySQL database, so I got the MySQL Migration Toolkit. I pick "MS SQL Server" and then it asks for the hostname/username/password/database. I'm not 100% sure on these, but I used "localhost" (running on same computer), left the port as is (1433) and the username/password ("test") for the SQL Server. And I used the database name for the SQL Server database I'm looking to import. I clicked next, enter my MySQL database details and then attempt to run it and I get this error: Connecting to source database and retrieve schemata names. Initializing JDBC driver ... Driver class MS SQL JDBC Driver Opening connection ... Connection jdbc:jtds:sqlserver://localhost:1433/Orders;user=test;password=blah;charset=utf-8;domain= The list of schema names could not be retrieved (error: 0). ReverseEngineeringMssql.getSchemata :Network error IOException: Connection refused: connect Details: net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:372) net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50) net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:178) java.sql.DriverManager.getConnection(Unknown Source) java.sql.DriverManager.getConnection(Unknown Source) com.mysql.grt.modules.ReverseEngineeringGeneric.establishConnection(ReverseEngineeringGeneric.java:141) com.mysql.grt.modules.ReverseEngineeringMssql.getSchemata(ReverseEngineeringMssql.java:99) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) com.mysql.grt.Grt.callModuleFunction(Unknown Source)

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  • Is there anything else I can do to optimize this MySQL query?

    - by Legend
    I have two tables, Table A with 700,000 entries and Table B with 600,000 entries. The structure is as follows: Table A: +-----------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number | bigint(20) unsigned | YES | | NULL | | +-----------+---------------------+------+-----+---------+----------------+ Table B: +-------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number_s | bigint(20) unsigned | YES | MUL | NULL | | | number_e | bigint(20) unsigned | YES | MUL | NULL | | | source | varchar(50) | YES | | NULL | | +-------------+---------------------+------+-----+---------+----------------+ I am trying to find if any of the values in Table A are present in Table B using the following code: $sql = "SELECT number from TableA"; $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_assoc($result)) { $number = $row['number']; $sql = "SELECT source, count(source) FROM TableB WHERE number_s < $number AND number_e > $number GROUP BY source"; $re = mysql_query($sql) or die(mysql_error); while($ro = mysql_fetch_array($re)) { echo $number."\t".$ro[0]."\t".$ro[1]."\n"; } } I was hoping that the query would go fast but then for some reason, it isn't terrible fast. My explain on the select (with a particular value of "number") gives me the following: mysql> explain SELECT source, count(source) FROM TableB WHERE number_s < 1812194440 AND number_e > 1812194440 GROUP BY source; +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | 1 | SIMPLE | TableB | ALL | number_s,number_e | NULL | NULL | NULL | 696325 | Using where; Using temporary; Using filesort | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ 1 row in set (0.00 sec) Is there any optimization that I can squeeze out of this? I tried writing a stored procedure for the same task but it doesn't even seem to work in the first place... It doesn't give any syntax errors... I tried running it for a day and it was still running which felt odd. CREATE PROCEDURE Filter() Begin DECLARE number BIGINT UNSIGNED; DECLARE x INT; DECLARE done INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT number FROM TableA; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; CREATE TEMPORARY TABLE IF NOT EXISTS Flags(number bigint unsigned, count int(11)); OPEN cur1; hist_loop: LOOP FETCH cur1 INTO number; SELECT count(*) from TableB WHERE number_s < number AND number_e > number INTO x; IF done = 1 THEN LEAVE hist_loop; END IF; IF x IS NOT NULL AND x>0 THEN INSERT INTO Flags(number, count) VALUES(number, x); END IF; END LOOP hist_loop; CLOSE cur1; END

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  • MySQL daemon keeps terminating unexpectedly

    - by Yehia A.Salam
    The MySQL daemon on my CentOS server keeps crashing, i got the logs from /var/logs/mysqld but still i am not sure how to fix this: 121114 16:22:56 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 121114 21:55:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 121114 21:55:11 [Note] Plugin 'FEDERATED' is disabled. 121114 21:55:11 InnoDB: The InnoDB memory heap is disabled 121114 21:55:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121114 21:55:11 InnoDB: Compressed tables use zlib 1.2.3 121114 21:55:11 InnoDB: Using Linux native AIO 121114 21:55:11 InnoDB: Initializing buffer pool, size = 128.0M 121114 21:55:11 InnoDB: Completed initialization of buffer pool 121114 21:55:11 InnoDB: highest supported file format is Barracuda. InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 121114 21:55:11 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 121114 21:55:12 InnoDB: Waiting for the background threads to start 121114 21:55:13 InnoDB: 1.1.6 started; log sequence number 77177262 121114 21:55:13 [Note] Event Scheduler: Loaded 0 events 121114 21:55:13 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.5.12' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) by Remi 121115 00:19:44 mysqld_safe Number of processes running now: 0 121115 00:19:44 mysqld_safe mysqld restarted 121115 0:19:47 [Note] Plugin 'FEDERATED' is disabled. 121115 0:19:47 InnoDB: The InnoDB memory heap is disabled 121115 0:19:47 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121115 0:19:47 InnoDB: Compressed tables use zlib 1.2.3 121115 0:19:47 InnoDB: Using Linux native AIO 121115 0:19:47 InnoDB: Initializing buffer pool, size = 128.0M InnoDB: mmap(137363456 bytes) failed; errno 12 121115 0:19:47 InnoDB: Completed initialization of buffer pool 121115 0:19:47 InnoDB: Fatal error: cannot allocate memory for the buffer pool 121115 0:19:47 [ERROR] Plugin 'InnoDB' init function returned error. 121115 0:19:47 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121115 0:19:47 [ERROR] Unknown/unsupported storage engine: InnoDB 121115 0:19:47 [ERROR] Aborting Edit #1 total used free shared buffers cached Mem: 496 370 126 0 24 110 -/+ buffers/cache: 234 261 Swap: 1023 9 1014 Edit #2 Also, largest table in my mysql is 20MB, so my the memory used should be pretty moderate. SELECT CONCAT(table_schema, '.', table_name), CONCAT(ROUND(table_rows / 1000000, 2), 'M') rows, CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G') DATA, CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G') idx, CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') total_size, ROUND(index_length / data_length, 2) idxfrac FROM information_schema.TABLES ORDER BY data_length + index_length DESC LIMIT 10;

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  • How to easily upgrade MySQL 5.0.32 to MySQL 5.1.20 or higher on Debian Etch?

    - by Ferdy
    I have a home server running Debian Etch with MySQL 5.0.32 on it. I'm not much of a Linux administrator but two years ago I installed the server and it runs fine. I used the official MySQL package for Debian at that time. Since then I have been happily making use of it. Now I need to use a MySQL function that is only available in MySQL 5.1.20 and higher. Therefore I would like to upgrade. I'm not that confident in messing with something I need every day so I wanted to check with you what the best upgrade path would be? Obviously I prefer a simple upgrade that keeps my database, users and settings in place as they are now.

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  • \G like vertical output in MySQL Workbench for show engine innodb status

    - by KCD
    show engine innodb status; is unusable in MySQL Workbench, as shown here: =====================================120329 12:39:32 INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last 17 seconds-----------------BACKGROUND THREAD-----------------srv_master_thread loops: 192438... However show engine innodb status \G is great on the mysql command line client. Is there any \G equivalent on MySQL workbench or better way to get this information?

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  • New Replication, Optimizer and High Availability features in MySQL 5.6.5!

    - by Rob Young
    As the Product Manager for the MySQL database it is always great to announce when the MySQL Engineering team delivers another great product release.  As a field DBA and developer it is even better when that release contains improvements and innovation that I know will help those currently using MySQL for apps that range from modest intranet sites to the most highly trafficked web sites on the web.  That said, it is my pleasure to take my hat off to MySQL Engineering for today's release of the MySQL 5.6.5 Development Milestone Release ("DMR"). The new highlighted features in MySQL 5.6.5 are discussed here: New Self-Healing Replication ClustersThe 5.6.5 DMR improves MySQL Replication by adding Global Transaction Ids and automated utilities for self-healing Replication clusters.  Prior to 5.6.5 this has been somewhat of a pain point for MySQL users with most developing custom solutions or looking to costly, complex third-party solutions for these capabilities.  With 5.6.5 these shackles are all but removed by a solution that is included with the GPL version of the database and supporting GPL tools.  You can learn all about the details of the great, problem solving Replication features in MySQL 5.6 in Mat Keep's Developer Zone article.  New Replication Administration and Failover UtilitiesAs mentioned above, the new Replication features, Global Transaction Ids specifically, are now supported by a set of automated GPL utilities that leverage the new GTIDs to provide administration and manual or auto failover to the most up to date slave (that is the default, but user configurable if needed) in the event of a master failure. The new utilities, along with links to Engineering related blogs, are discussed in detail in the DevZone Article noted above. Better Query Optimization and ThroughputThe MySQL Optimizer team continues to amaze with the latest round of improvements in 5.6.5. Along with much refactoring of the legacy code base, the Optimizer team has improved complex query optimization and throughput by adding these functional improvements: Subquery Optimizations - Subqueries are now included in the Optimizer path for runtime optimization.  Better throughput of nested queries enables application developers to simplify and consolidate multiple queries and result sets into a single unit or work. Optimizer now uses CURRENT_TIMESTAMP as default for DATETIME columns - For simplification, this eliminates the need for application developers to assign this value when a column of this type is blank by default. Optimizations for Range based queries - Optimizer now uses ready statistics vs Index based scans for queries with multiple range values. Optimizations for queries using filesort and ORDER BY.  Optimization criteria/decision on execution method is done now at optimization vs parsing stage. Print EXPLAIN in JSON format for hierarchical readability and Enterprise tool consumption. You can learn the details about these new features as well all of the Optimizer based improvements in MySQL 5.6 by following the Optimizer team blog. You can download and try the MySQL 5.6.5 DMR here. (look under "Development Releases")  Please let us know what you think!  The new HA utilities for Replication Administration and Failover are available as part of the MySQL Workbench Community Edition, which you can download here .Also New in MySQL LabsAs has become our tradition when announcing DMRs we also like to provide "Early Access" development features to the MySQL Community via the MySQL Labs.  Today is no exception as we are also releasing the following to Labs for you to download, try and let us know your thoughts on where we need to improve:InnoDB Online OperationsMySQL 5.6 now provides Online ADD Index, FK Drop and Online Column RENAME.  These operations are non-blocking and will continue to evolve in future DMRs.  You can learn the grainy details by following John Russell's blog.InnoDB data access via Memcached API ("NotOnlySQL") - Improved refresh of an earlier feature releaseSimilar to Cluster 7.2, MySQL 5.6 provides direct NotOnlySQL access to InnoDB data via the familiar Memcached API. This provides the ultimate in flexibility for developers who need fast, simple key/value access and complex query support commingled within their applications.Improved Transactional Performance, ScaleThe InnoDB Engineering team has once again under promised and over delivered in the area of improved performance and scale.  These improvements are also included in the aggregated Spring 2012 labs release:InnoDB CPU cache performance improvements for modern, multi-core/CPU systems show great promise with internal tests showing:    2x throughput improvement for read only activity 6x throughput improvement for SELECT range Read/Write benchmarks are in progress More details on the above are available here. You can download all of the above in an aggregated "InnoDB 2012 Spring Labs Release" binary from the MySQL Labs. You can also learn more about these improvements and about related fixes to mysys mutex and hash sort by checking out the InnoDB team blog.MySQL 5.6.5 is another installment in what we believe will be the best release of the MySQL database ever.  It also serves as a shining example of how the MySQL Engineering team at Oracle leads in MySQL innovation.You can get the overall Oracle message on the MySQL 5.6.5 DMR and Early Access labs features here. As always, thanks for your continued support of MySQL, the #1 open source database on the planet!

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  • mysql master-slave setup with synchronous replication

    - by imaginative
    I have a very trivial mysql master-slave setup going on between two servers. The problem is, replication is asynchronous, and this can cause issues (even on a low latency link), if the master server was to crash after a COMMIT before the replication thread from the slave was able to fetch the last bin log. Is there anyway to force mysql to do synchronous commits so that data consistency is guaranteed in a mysql-slave relationship?

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  • How do you debug MySQL stored procedures?

    - by Cory House
    My current process for debugging stored procedures is very simple. I create a table called "debug" where I insert variable values from the stored procedure as it runs. This allows me to see the value of any variable at a given point in the script, but is this is there a better way to debug MySQL stored procedures?

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  • Get MySQL 5.6 Certified at a Much Reduced Price

    - by Antoinette O'Sullivan
    You have already heard the great news that you can now prove your knowledge of MySQL Server 5.6 with the new MySQL certification exams: Oracle Certified Professional, MySQL 5.6 Developer Oracle Certified Professional, MySQL 5.6 Database Administrator Until December 14th 2013, there exams are beta phase so you get a fully-fledged certification at a much reduced price; for example $50 in the United States or 39 euros in the euro zone. There is a lot of excitement around these new certifications as people ramp up to prove their expertise. Here is some information that might help you are you prepare to get MySQL 5.6 certified. Establishing What You Need to Know Your first step is to chose whether you want to take the MySQL 5.6 Developer or MySQL 5.6 Database Administrator certification. Now click on the Exam Topics tab on the corresponding certification page. You will see a list of topics that you will be tested on during the certification exam. These are the areas that you need to improve your knowledge on, if you are not already expert. Register For a Certification Exam Click on the relevant certification and then click on Register for this Exam. The Pearson VUE site will guide you through signing up for an event at a date and location to suit you. Preparing to Take an Exam For each certification, you can click on the Exam Preparation tab. This indicates the recommended training and reference material that can help you prepare to sit the exam. And why not follow the experience of others preparing to take these exams. Todd Farmer Morgan Tocker Moritz Schupp Open Source Dba's blog You could also read MySQL hints and tips from Jeremy Smyth who is part of the team writing the authentic MySQL curriculum.

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  • Java-JDBC-MySQL Error

    - by LeonardPeris
    I'm trying to get my java program to talk to a MySQL DB. So i did some reading and downloaded MySQL Connector/J. I've extracted it into my home directory ~. Here are the contents. user@hamster:~$ ls LoadDriver.class LoadDriver.java mysql-connector-java-5.1.18-bin.jar The contents of LoadDriver.java are user@hamster:~$ cat LoadDriver.java import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; // Notice, do not import com.mysql.jdbc.* // or you will have problems! public class LoadDriver { public static void main(String[] args) { try { // The newInstance() call is a work around for some // broken Java implementations Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (Exception ex) { System.out.println(ex); } } } The contents are the same from http://dev.mysql.com/doc/refman/5.1/en/connector-j-usagenotes-basic.html#connector-j-usagenotes-connect-drivermanager with the only change that the Exception is being printed to console in the catch block. I compile it as follows leonard@hamster:~$ javac LoadDriver.java When I try to execute it, the following is the ouput. leonard@hamster:~$ java LoadDriver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver This output is consistent with the executing command, but when trying to run it with the prescribed CLASSPATH method I run into the following issue. leonard@hamster:~$ java -cp /home/leonard/mysql-connector-java-5.1.18-bin.jar LoadDriver Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver Caused by: java.lang.ClassNotFoundException: LoadDriver at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:321) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:266) Could not find the main class: LoadDriver. Program will exit. Am I missing something? How do I get MySQL's own code samples running.

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