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• how to allow a remote machine to connect to a mysql database?

  - by iamrohitbanga

  I have a mysqld server running on a windows 7 machine. how to allow a windows vista machine to connect to this server. I need to set some permissions using grant all privileges to username@ip but what should be the username. i am not sure with windows.

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• MySQL query very slow on Amazon RDS but really fast on my laptop?

  - by Luc

  I would love to know if anybody knows why this is happening. i've just migrated over to Amazon RDS for our website and our biggest query which takes .2 seconds to execute on my macbook takes 1.3 seconds to execute on the most expensive RDS instance. Obviously i've disabled query cache (and tested this) on my local computer and both databases are exactly the same. InnoDB, both have the same indexes etc. It's costing us a fortune ($2000 per month) for the fastest RDS instance and i'm losing faith quickly. any ideas?

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• Possible to make mysql server both master and slave?

  - by Amy Anuszewski

  I am getting ready to move a database from one server to another. In order to reduce downtime for the client, I am wondering if it would be possible for me to turn on replication and give it time to replicate fully, then just point the customer to the new server. The issue I have is that the server I'm moving to has existing, active databases for other customers. And, the server I'm moving from has other active customers who will not be moving at this time. Is this even possible? If so, how do I configure the server I am moving from and the one I am moving to?

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• Why is skip-innodb causing mysql crash even after changing tables to myisam?

  - by Chris

  I am on a VPS, so I am trying to conserve memory. Across all my databases, I had a total of 5 innodb tables; I converted them all to myisam. However, even after triple-checking to make sure I had no more innodb tables, I am still crashing when I use skip-innodb in my.cnf.

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• Can I change a MySQL table back and forth between InnoDB and MyISAM without any problems?

  - by Daniel Magliola

  I have a site with a decently big database, 3Gb in size, a couple of tables with a dozen million records. It's currently 100% on MyISAM, and I have the feeling that the server is going slower than it should because of too much locking, so I'd like to try going to InnoDB and see if that makes things better. However, I need to do that directly in production, because obviously without load this doesn't make any difference. However, I'm a bit worried about this, because InnoDB actually has potential to be slower, so the question is: If I convert all tables to InnoDB and it turns out i'm worse off than before, can I go back to MyISAM without losing anything? Can you think of any problems I might encounter? (For example, I know that InnoDB stores all data in ONE big file that only gets bigger, can this be a problem?) Thank you very much Daniel

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• What are some general tips to make InnoDB for MySQL perform at its highest?

  - by James Simpson

  I've been using MyISAM exclusively for several years now and know the ins-and-outs pretty well of how to optimize it, but I've just recently started using InnoDB for some of my tables and don't know that much about it. What are some general tips to help improve the performance of these InnoDB tables (they were converted from MyISAM and have anywhere from 100k - 2M rows and most won't use transactions).

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• How do I change my MYSQL timezone to be permanent Pacific time?

  - by Alex

  so that when I do now(), it will show the current California time?

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• Is there a MySQL performance benchmark to measure the impact of utf8_unicode_ci versus utf8_general_ci?

  - by MiniQuark

  I read here and there that using the utf8_unicode_ci collation ensures a better treatment of unicode text (for example, it knowns how to expand characters such as 'œ' into 'oe' for searching and ordering) compared to the default utf8_general_ci which basically just strips diacritics. Unfortunately, both sources indicate that utf8_unicode_ci is slightly slower than utf8_general_ci. So my question is: what does "slightly slower" mean? Has anyone run benchmarks? Are we talking about a -0.01% performance impact or rather something like -25%? Thanks for your help.

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• When securing MySql, is it better to create a user with root-like priviliges and then remove the 'ro

  - by PoppySeeds

  This would seems to prevent attackers who know that a 'root' user exists?

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• mysql 5.1 - innodb - query_cache_size - 9,418,108 queries have been removed from the query cache due to lack of memory

  - by Tom C

  Currently running on a 16GB system - Ubuntu 64 bit. INnodb Buffer Pool is set to 10GB. tuning-primer shows the following: QUERY CACHE Query cache is enabled Current query_cache_size = 512 M Current query_cache_used = 501 M Current query_cache_limit = 4 M Current Query cache Memory fill ratio = 97.87 % Current query_cache_min_res_unit = 4 K However, 9418108 queries have been removed from the query cache due to lack of memory Perhaps you should raise query_cache_size That is over 9million queries removed. System uptime is 8 days. Should I remove the Query Cache altogether? Our db is always under heavy I/O. tia

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• How do I split a large MySql backup file into multiple files?

  - by Brian T Hannan

  I have a 250 MB backup SQL file but the limit on the new hosting is only 100 MB ... Is there a program that let's you split an SQL file into multiple SQL files? It seems like people are answering the wrong question ... so I will clarify more: I ONLY have the 250 MB file and only have the new hosting using phpMyAdmin which currently has no data in the database. I need to take the 250 MB file and upload it to the new host but there is a 100 MB SQL backup file upload size limit. I simply need to take one file that is too large and split it out into multiple files each containing only full valid SQL statements (no statements can be split between two files).

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• Where does MySQL store its database files on OS X?

  - by avernet

  As I would like to move those files from one server to another server, while the database is offline.

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• How Export Result of MySQL Query on PHPMyAdmin 3.4.3?

  - by grape

  1) I've got a 30K row table. 2) When I run a long, 50-line query on that table, a GROUP function reduces the number of rows to 7K. 3) I want to export the grouped 7K rows as a new table, or save them as a CSV. When I attempt to export, instead of getting the grouped 7K rows, I get the old, pre-query 30K rows. What am I doing wrong, and what should I be doing? NOTE: I'm not a coder, so I'd really appreciate a solution that just used the PHPMyAdmin GUI. Thanks!

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• Big Data – ClustrixDB – Extreme Scale SQL Database with Real-time Analytics, Releases Software Download – NewSQL

  - by Pinal Dave

  There are so many things to learn and there is so little time we all have. As we have little time we need to be selective to learn whatever we learn. I believe I know quite a lot of things in SQL but I still do not know what is around SQL. I have started to learn about NewSQL recently. If you wonder what is NewSQL I encourage all of you to read my blog post about NewSQL over here Big Data – Buzz Words: What is NewSQL – Day 10 of 21. NewSQL databases are quickly becoming popular – providing the scale of NoSQL with the SQL features and transactions. As a part of learning NewSQL database, I have recently started to learn about ClustrixDB. ClustrixDB has been the most mature NewSQL database used by some of the largest internet sites in the world for over 3 years, with extensive SQL support. In addition to scale, it provides fast real-time analytics by bringing massively parallel processing (MPP), available only in warehousing databases, to the transactional database. The reason I am more intrigued about learning ClustrixDB is their recent announcement on Oct 31. ClustrixDB was only available as an appliance, but now with their software release on Oct 31, everyone can use it. It is now available as forever free for up to 12 cores with community support, and there is a 45 day trial for unlimited cluster sizes. With the forever free world, I am indeed interested in ClustrixDB now. I know that few of the leading eCommerce sites in the world uses them for their transactional database. Here are few of the details I have quickly noted for ClustrixDB. ClustrixDB allows user to: Scale by simply adding nodes to the cluster with a single command Run billions of transactions a day Run fast real-time analytics Achieve high-availability with recovery from node failure Manages itself Easily migrate from MySQL as it is nearly plug-and-play compatible, use MySQL drivers, tools and replication. While I was going through the documentation I realized that ClustrixDB also has extensive support for SQL features including complex queries involving joins on a dozen or more tables, aggregates, sorts, sub-queries. It also supports stored procedures, triggers, foreign keys, partitioned and temporary tables, and fully online schema changes. It is indeed a very matured product and SQL solution. Indeed Clusterix sound very promising solution, I decided to dig a bit deeper to understand who are current customers of the Clustrix as they exist in the industry for quite a few years. Their client list is indeed very interesting and here is my quick research about them. Twoo.com – Europe’s largest social discovery (dating) site runs 4.4 Billion Transactions a day with table sizes over a Terabyte, on a 168 core cluster. EngageBDR – Top 3 in the online advertising category uses ClustrixDB to serve 6.9 billion ads a day through real-time bidding platform. Their reports went from 4 hours to 15 seconds. NoMoreRack – Top 2 fastest growing e-commerce company in US used ClustrixDB for high availability and fast growth through Amazon cloud. MakeMyTrip – India’s leading travel site runs on ClustrixDB with two clusters running as multi-master in Chennai and Bangalore. Many enterprises such as AOL, CSC, Rakuten, Symantec use ClustrixDB when their applications need scale. I must accept that I am impressed with the information I have learned so far and now is the time to do some hand’s on experience with their product. I want to learn this technology so in future when it is about NewSQL, I know what I am talking about. Read more why Clustrix explains why you ClustrixDB might be the right database for you. Download ClustrixDB with me today and install it on your machine so in future when we discuss the technical aspects of it, we all are on the same page. The software can be downloaded here. Reference : Pinal Dave (http://blog.SQLAuthority.com)Filed under: Big Data, MySQL, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Clustrix

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• Python equivalent of mysql_real_escape_string, for getting strings safely into MySQL?

  - by AP257

  Hi all Is there a Python equivalent of PHP's mysql_real_escape_string? I'm trying to insert some strings into a MySQL db direct from Python, and keep getting tripped up by quotes in the strings. mysql_string = "INSERT INTO candidate (name, address) VALUES " for k, v in v_dict.iteritems(): mysql_string += " ('" + v_dict['name'] + "', '" + v_dict['address'] + "'), " mysql_string += ";" cursor.execute(mysql_string) I've tried re.escape() but that escapes every non-alphanumeric character in the strings, which isn't what I need - I just need to escape single quotes in this instance (plus more generally anything else that might trip up MySQL). Could do this manually I guess, but is there a smarter way to do it in Python?

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• MySQL Triggers - How to capture external web variables? (eg. web username, ip)

  - by Ken

  Hi, I'm looking to create an audit trail for my PHP web app's database (eg. capture inserts, updates, deletes). MySQL triggers seem to be just the thing -- but how do I capture the IP address and the web username (as opposed to the mysql username, localhost) of the user who invoked the trigger? Thanks so much. -Ken P.S. I'm working with this example code I found: DROP TRIGGER IF EXISTS history_trigger $$ CREATE TRIGGER history_trigger BEFORE UPDATE ON clients FOR EACH ROW BEGIN IF OLD.first_name != NEW.first_name THEN INSERT INTO history_clients ( client_id , col , value , user_id , edit_time ) VALUES ( NEW.client_id, 'first_name', NEW.first_name, NEW.editor_id, NEW.last_mod ); END IF; IF OLD.last_name != NEW.last_name THEN INSERT INTO history_clients ( client_id , col , value , user_id , edit_time ) VALUES ( NEW.client_id, 'last_name', NEW.last_name, NEW.editor_id, NEW.last_mod ); END IF; END; $$

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• What's the difference between !col and col=false in MySQL?

  - by Mask

  The two statements have totally different performance: mysql> explain select * from jobs where createIndexed=false; +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | 1 | SIMPLE | jobs | ref | i_jobs_createIndexed | i_jobs_createIndexed | 1 | const | 1 | | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ 1 row in set (0.01 sec) mysql> explain select * from jobs where !createIndexed; +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | 1 | SIMPLE | jobs | ALL | NULL | NULL | NULL | NULL | 17996 | Using where | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ Column definition and related index for aiding analysis: createIndexed tinyint(1) NOT NULL DEFAULT 0, create index i_jobs_createIndexed on jobs(createIndexed);

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• C# and MySQL .NET Connector - Any way of preventing SQL Injection attacks in a generic class?

  - by John M

  My idea is to create some generic classes for Insert/Update/Select via a C# (3.5) Winforms app talking with a MySQL database via MySQL .NET Connector 6.2.2. For example: public void Insert(string strSQL) { if (this.OpenConnection() == true) { MySqlCommand cmd = new MySqlCommand(strSQL, connection); cmd.ExecuteNonQuery(); this.CloseConnection(); } } Then from anywhere in the program I can run a query with/without user input by just passing a SQL query string. Reading around on SO is starting to give me the indication that this may lead to SQL injection attacks (for any user-input values). Is there anyway of scrubbing the inputted strSQL or do I need to go and create individual parameterized queries in every method that needs to do a database function?

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• How do I configure the binary log file for auditing in MySQL?

  - by Parth

  How to use Binary Log file for Auditing in MySQL? I want to track the change in a DB using Binary Log so that I can replicate these changes to other DB please do not give me hyperlinks for MySQL website. please direct me to find the solution EDIT I have looked for auditing options and created a script using Triggers for that, but due toi the Joomla DB structure it did'nt worked for me, hence I have to move on to Binary Log file concept now i am stucked in initiating the concept as I am not getting the concept of making the server master/slave, so can any body guide me how to actually initiate it via PHP?

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• Does Triggers in MySQL for Audit Log Slows Down The Main update Insert or delete process?

  - by Parth

  Does Triggers in MySQL for Audit Log Slows Down The Main update Insert or delete process?

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• Unable to connect to a local MYSQL server on wireles LAN.

  - by Arnab

  Ok, Here is the technical description. My laptop's config: Ip Adress:192.168.2.5 Mysqlserver 5.0 on port : 3306 Operating system: Ubuntu jaunty (9.04) 3306 is open for both incoming and outgoing. My friend's laptop config: Ip Adress:192.168.2.4 Mysqlserver 5.0 on port : 3306 Operating system: Windows XP pro 3306 is open for both incoming and outgoing. Both are on a wireless LAN connected through a belkin router (192.168.2.1) Both the MYSQL servers have been given the sufficient GRANT privileges. I am also able to connect from 192.168.2.4 to 192.168.2.5's MYSQL instance but the vice versa is not happening. I am getting an (100061) error. Tried Telnetting on 3306; again happening from 192.168.2.4 to 192.168.2.5 but not the vice versa. Am I doing something wrong? Kindly suggest.

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• In SQL / MySQL, can a Left Outer Join be used to find out the duplicates when there is no Primary ID

  - by Jian Lin

  I would like to try using Outer Join to find out duplicates in a table: If a table has Primary Index ID, then the following outer join can find out the duplicate names: mysql> select * from gifts; +--------+------------+-----------------+---------------------+ | giftID | name | filename | effectiveTime | +--------+------------+-----------------+---------------------+ | 2 | teddy bear | bear.jpg | 2010-04-24 04:36:03 | | 3 | coffee | coffee123.jpg | 2010-04-24 05:10:43 | | 6 | beer | beer_glass.png | 2010-04-24 05:18:12 | | 10 | heart | heart_shape.jpg | 2010-04-24 05:11:29 | | 11 | ice tea | icetea.jpg | 2010-04-24 05:19:53 | | 12 | cash | cash.png | 2010-04-24 05:27:44 | | 13 | chocolate | choco.jpg | 2010-04-25 04:04:31 | | 14 | coffee | latte.jpg | 2010-04-27 05:49:52 | | 15 | coffee | espresso.jpg | 2010-04-27 06:03:03 | +--------+------------+-----------------+---------------------+ 9 rows in set (0.00 sec) mysql> select * from gifts g1 LEFT JOIN (select * from gifts group by name) g2 on g1.giftID = g2.giftID where g2.giftID IS NULL; +--------+--------+--------------+---------------------+--------+------+----------+---------------+ | giftID | name | filename | effectiveTime | giftID | name | filename | effectiveTime | +--------+--------+--------------+---------------------+--------+------+----------+---------------+ | 14 | coffee | latte.jpg | 2010-04-27 05:49:52 | NULL | NULL | NULL | NULL | | 15 | coffee | espresso.jpg | 2010-04-27 06:03:03 | NULL | NULL | NULL | NULL | +--------+--------+--------------+---------------------+--------+------+----------+---------------+ 2 rows in set (0.00 sec) But what if the table doesn't have a Primary Index ID, then can an outer join still be used to find out duplicates?

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• MYSQL query to get all entries with specific time, from PHP?

  - by meds

  I'm trying to query a mysql table which places its date in the following format: yyyy-mm-dd hh:mm:ss So it's date and time, and that's all in a single field. Now from php I want to get the time and query the table to only return entries where the date field is less than 24 hours old. I'm having issues with the system because PHPs get time seems to return the values seperately and I'm struggling to figure out how to make it work with mysql queries. This seems fairly simple but I'm quite new to php so sorry if I'm completely missing something..

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• mysql C connector unresolved symbols on Win2k8 but not on XP?

  - by jimmy glick

  I have a visual C++ 2008 express project which compiles fine on Windows XP with mysql C connector 6.0.2. When I copy the project over to a Windows Server 2008 x64 machine, it gets a bunch of linker errors like "unresolved external symbol _mysql_server_end@0" "unresolved external symbol _mysql_close@4" "unresolved external _mysql_real_connect@32". Is the mysql C connector 6.0.2 known to not work with Win Server 2008? (Note, the C connector is installed into the same place on both machines, and since I just copied over the project wholesale, it still has the correct libmysql.lib include. The interesting thing is that the errors I get on XP if I remove the libmysql.lib are not the same errors I'm getting on Win2k8, so that's what makes me think it might be an incompatibility...or maybe it's just because win2k8 is x64 and XP is x86?) Thanks

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• Make MySQL database replication always use the most free node?

  - by Chad Johnson

  We started using Multi-Master Replication Manager for MySQL, and I am wondering whether it is possible to to treat this setup like multi-symmetric processing: a process pops off the process queue, and the node (in this case a server) that is most free is selected for the job. It seems that what happens is, the service switches to a slave ONLY when it mysqld crashes or goes away. Is there a way to make database replication for MySQL act in more of a distributed manner? Maybe there is other software besides MMM that can do this? Is there a way to switch the reader role to another server whene mysqld slows down (rather than just when it fails)?

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