MySQL : Open-Source, Relational Database Management System

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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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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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Create a trigger to update table data on another Server's database

I am creating a trigger in MySQL and I need a little help. I have 2 websites, 2 databases (same name) on 2 different web servers, S1 & S2. These databases have the same tables names. I want ...
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2answers
1k views

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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1k views

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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2k views

MySQL dynamically optimize innodb tables without “file per table” setting

We are getting a “too many connections” error once a week the same time a mysql procedure runs. The procedure runs “optimize table” on hundreds of tables and takes nearly ten hours to finish, taking ...
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3k views

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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625 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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2answers
2k views

InnoDB Tablespace critical error in great need of a fix

Link to screenshot : http://www.nouvellesduquartier.com/i/1/p/Munin_%20Critical_MySql_InnoDB_.JPG (The value reported is outside the allowed range - Byte free, free, gauge, warn, critic) Question: ...
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91 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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603 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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1k views

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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2k views

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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2answers
7k views

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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1answer
461 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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1answer
88 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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2answers
421 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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3answers
3k views

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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358 views

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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1answer
798 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
810 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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1answer
682 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
2k views

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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295 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
912 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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574 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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1answer
662 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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2answers
2k views

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
270 views

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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1answer
39 views

what else to enable to make LOAD DATA INFILE work?

Anyone got an idea what to enable to make the LOAD DATA INFILE working? I have the global variable 'local_infile' set to ON, the database is answering queries just normaly, but LOAD DATA INFILE ...
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2answers
619 views

SQL Server equivalent to MySQL UNIQUE index?

In MySQL (5.1) I am able to create a Index on a field that is type UNIQUE. This ensures that the field contains only unique items. Is there something equivalent to that feature in SQL Server 2008? ...
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260 views

Does “deprecated” in MySQL means “not guaranteed” or “still guaranteed”?

MySQL 3.23/4.0/4.1 and 5.1 states: If you use GROUP BY [ for select ], output rows are sorted according to the GROUP BY columns as if you had an ORDER BY for the same columns. ➫➫➫ However, MySQL ...