MySQL : Open-Source, Relational Database Management System

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Massive MySQL delete from CSV file

To insert massive CSV file into MySQL, there is LOAD DATA INFILE, but is there any similar command to delete massive entries with keys stored in a massive CSV file? If not, what would you see as the ...
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Should we explicitly lock MyISAM tables or is it implicit…?

Does MyISAM tables automatically lock a table for each select or insert statement .... I mean if I query the database as select * from tablename then does the MySQL engine first lock it for read ...
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Mysql query stress testing program [closed]

We are writing queries for our website, and when we test the queries in a dev environment, the queries run pretty fast. The problem that we are having is the dev environment has less that 10 active ...
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How to get rid of using temporary when using DISTINCT in MySQL?

When I do the following, I get Using where; Using index; Using temporary. How do I get rid of Using temporary? http://sqlfiddle.com/#!8/f61a2/3/0 CREATE TABLE `test` ( `a` varchar(45) NOT NULL, ...
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Migration of MySQL to SQL Server

I need to migrate a MySQL database to SQL Server 2012. Found enough information about it -- looks like it can be done either with SSMA tool or via Data Import utility in SQL Server Management Studio. ...
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226 views

Improve performance on write-only table?

I am using MySQL 5.5 with innoDB. The basis of my server is Netty, JDBC and BoneCP. I have a log table that contains user inputs(HTTP header, request body etc). This table will only be read very ...
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joining two tables and counting joined rows

table 1 : categories -------------------------------------------------------------- cat_id | cat_title -------------------------------------------------------------- 1 | sports 2 | news ...
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115 views

Can MySql nested SP be a bottleneck?

We have this MySQL SP, which calls a nested SP. It seems it does NOT perform well under load. It is possible that this SP becomes slow under load because it calls a nested SP and uses temporary ...
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179 views

How to copy a table during replication in MySQL?

I have two MySQL servers; db1 and db2. db1 is production and db2 is for reporting. I have setup replication where db1 is master and db2 is slave. This current setup works fine. I was given a new ...
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Converting MySQL 5.6.10 - 32 bit to 64 bit version

I am currently using MySQL DB Version 5.6.10 for 32 bit running in 64 bit Window OS.I want to change it to 64 bit without taking any dump..Can anyone help in this?
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Experience with Scalearc sharding?

Does anyone have experience with Scalearc sharding and it's ability to scale ? Does Scalearc needs to have the whole data in memory or does it behave well with disk storage ? I'm thinking to big ...
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1answer
3k views

Why should I use InnoDB and MySql instead of XtraDB and MariaDB? [closed]

Why should I use InnoDB and MySql instead of XtraDB and MariaDB, except that InnoDB and Mysql happen to be installed by default on my servers? Why isn't MariaDB and XtraDB installed by default ...
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Which schema is better for a shopping project? [closed]

I'm working on a business-to-customer project that has variety of product types. There are a few properties like name, description, brand_id that each product has but there are also many specialized ...
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144 views

To normalize or not

I'm scraping data from a website and they have pages for Users and Groups. The pages are pretty similar; id, name, description, created date, number of elements and custom background. They also have a ...
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985 views

Cannot start MySQL cluster with single node

For some testing I have installed MySQL Cluster. I can get it to work with configuration suggested in Lunix guick start guide. My configuration: [ndb_mgmd] hostname=localhost ...
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2answers
797 views

How to index for a query with independent range conditions?

What is the best way to index a table that I query using independent range conditions? E.g. WHERE X < ? and Y > ?
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424 views

MySQL MyISAM index causes query to match no rows; indexes disabled, rows match

I created a table and index as described in this SE post, but when I query the table for a particular ID, no matches are found. When I disable the index, matches are found. Commands ran: CREATE ...
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115 views

Max_packet_allowed setting for Windows 7

We have windows xp machine with older version of mysql. So when we need to import huge data we just set the max_allowed_packet=1500M in the C:\Program Files\MySQL\MySQL Server 5.1 . Now we loaded the ...
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116 views

Optimizing and maintaining test databases for a web development team

Right now when we test, we mysqldump from the production database, load it into the test database server, and then use scripts to scrub sensitive data. As the database is getting bigger, this process ...
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MySQL SSL encryption

Does setting MASTER_SSL to 1 in change master ensure encryption without specifying options MASTER_SSL_CA, MASTER_SSL_CAPATH, MASTER_SSL_CERT, MASTER_SSL_KEY ? After setting MASTER_SSL to 1, show ...
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1answer
682 views

Export just rows modified in last month (date defined by user)

I'm asking if it's possible in MySQL to export just rows modified in a period of time for example in the past month, if it is possible, how?
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1answer
390 views

Need to find the number of employee who are not in all department

i have a table T1 which has two columns empname , department every emp must be in 37 department , but there are some employee who are in less than 37 department . I need to find the names of emp who ...
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281 views

How to enable SSL in MySQL on Windows?

I'm a student doing a project which uses JDBC and MySQL (on Windows). I have an application with connects to a MySQL server on a remote host. To have a secure connection, I found this : ...
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150 views

How we take dump with batch of records option?

we have 30 GB database.we want to take backup of this database. here the question is we want to take the backup batch of every 10k records. How we can take batch of records backup using mysqldump
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reset mysql root password on ubuntu

In short: my goal is to reset mysql root password on ubuntu. Background: I set up a ubuntu desktop and installed LAMP stack last week. I then went to do something else, and just got back to carry on ...
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Speeding up mysqldump / reload

Converting a large schema to file-per-table and I will be performing a mysqldump/reload with --all-databases. I have edited the my.cnf and changed "innod_flush_log_at_trx_commit=2" to speed up the ...
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Too Many database connections on Amazon RDS

We are having problems with users running queries/views in Drupal that occasionally cause our site to freeze. The freeze occurs because the query causes the number of database connections to go up to ...
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643 views

Database replication using wamp?

I have created a POS system for our corporation, in the HQ we have a wamp server with the main database, we also have more than 25 branches across the country. I will setup a wamp server on each ...
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1answer
93 views

Am I overengineering MySQL?

On my project, I have to make difference between registered users, and simple visitors. Both of them can set their own properites, specified in accounts and visitors table. I identify them by cookie, ...
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621 views

MySQL Read Speed and Partitioning on Separate Drives

Introduction Simple project but for an heavy read load -90% reads- over a table(~20Milion Rows ever-growing where I have to boost performance and ensure response low time for read queries) that was ...
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Steps to upgrade MySQL from version 5.0 to version 5.5

I have been developing under MySQL v5.0 for a while now and need to upgrade to v5.5 to be in step with the hosted production server. After having searched for precise steps to do this migration, I am ...
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how to resolve ELFCLASS32 error in mysql for UDF lib_mysqludf_sys.so

I'm trying to install lib_mysqludf_sys.so in mysql to create sys_exec function which will run an external java programm .. first of all i issued this command : CREATE FUNCTION sys_exec RETURNS INT ...
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How to import data from a pair of .mdf/.ldf files into a MySQL database [duplicate]

I have two Microsoft SQL Server database files named "xxx.mdf" & "xxx.ldf" and I want to import that database into MySQL so I can run queries against it using phpMyAdmin. How would I go about ...
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469 views

optimize big sql query

My query has to return a statistics for example for march containing productname and price and its sidedishes (1:n relation) with the right price of each sidedish and the right tax for each sidedish ...
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89 views

Do I need tweak something for this MySQL setup?

I'm running a fairly popular website with the following stats and setup. stats: ~250,000 pageviews per day, rendering ~47 queries / second to MySQL setup: the MySQL instance is running alone on a ...
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434 views

Using MySQL InnoDB as an Archive

My site has a main MySQL InnoDB table that it does most of its work on. New rows get inserted at a rate of 1 million per week, and rows older than a week gets moved over to an archive table on a daily ...
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How to avoid deadlock while updating 2 rows in MySQL

This is a interview problem: There is a perl program that updates the database, and it could run in different processes. One process may execute a transaction like: update row A -> update ...
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How to do point in time recovery of binary log files into .sql file

I have written a shell script to do an incremental backup of MySQL database. For point in time recovery I'm using the binary logs generated in /var/lib/mysql directory. For point-in-time recovery, Im ...
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822 views

MySQL InnoDB locking on combined UPDATE-JOIN statements

on querying statements which contain an UPDATE combined with JOIN, we are getting the following errors: Statements writing to a table with an auto-increment column after selecting from another table ...
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2answers
822 views

How to mix pairs of rows without JOIN (in a temporary table)?

I have a TEMPORARY table containing pairs of key/value as id col1 col2 type pair 1 key1 key2 key 1 2 value1 value2 value 1 3 key3 ...
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690 views

Optimising MySQL query with lots of self-joins

I have an entity_relationship table that describes relationships between entities. Each relationship will have 2+ entities involved. In some cases it can be said that one entity is a constituent of a ...
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1answer
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What is the difference between int(8) and int(5) in mysql? [duplicate]

I found out, that if you have a field defined as INT(8) without ZEROFILL it will behave exactly as INT(5) in both cases the maximum value is −2,147,483,648 to 2,147,483,647, from −(2^31) to 2^31 − 1 ...
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59 views

Searching through lots of applications

Google search has instant search feature. While you are typing, it finds the pages. Apple.com search box. StackExchange ask question part finds similar questions while you are typing question title. ...
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308 views

What would be possible reasons for a DeadLock to occur in Mysql Database?

If some one has a Table structure some thing like this, CREATE TABLE IF NOT EXISTS `domain_source` (`nid` int(11) NOT NULL DEFAULT '0', `domain_id` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`nid`) ) ...
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2answers
951 views

Dates changed to 0000-00-00

Previously, on my table (~81000 rows), I have had date and time fields set as VARCHAR instead of date/time. All those dates were of the type MM/DD/YY. I changed the type from VARCHAR to DATE and TIME ...
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1answer
584 views

MySQL table with multiple values in one field

I'm building a database for a real estate company. The real estate properties are managed by sales people using a CodeIgniter website. How should I proceed with the database design for this table? ...
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707 views

MySQL stress test tool, remote server preferred

For MySQL stress test there exists programs: http://dev.mysql.com/doc/mysqltest/2.0/en/test-programs.html Also mysqlslap exists: http://dev.mysql.com/doc/refman/5.5/en/mysqlslap.html Is it possible ...
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query to select data between todays date as well as tomorrows date time upto specific time

I have database "raj" with table "pagination" In table pagination have "id", "actualtime" and "created" field id - auto_increment name- varchar created- datetime I want to display all rows which is ...
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4answers
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Index on 'GROUP BY' with functions

I have a log table. It logs visitor data (time of visit, browser, window size ...). I want to create reports. I use a query like this (MySQL): SELECT COUNT(*) as raw_views ... FROM logs WHERE ...
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199 views

How do I terminate a running SELECT query without restarting MySQL?

I have a MySQL select query that is not getting killed. Please help! And we have load avg building up on this server. | 64446 | root | localhost | dast-india | Killed | 3758 | Sorting result | ...