Planet MySQL Planet MySQL: Meta Deutsch Español Français Italiano 日本語 Русский Português 中文
Showing entries 1 to 10 of 1158 10 Older Entries

Displaying posts with tag: Databases (reset)

MMUG13: Practical MySQL Optimisation y Galera Cluster presentations
+0 Vote Up -0Vote Down

English: Madrid MySQL Users Group will be holding their next meeting on 17th June at 18:00h at EIE Spain in Madrid. Dimitri Vanoverbeke and Stéphane Combaudon from Percona will be offering two presentations for us:

  • Practical MySQL optimisations
  • Galera Cluster – introduction and where it fits in the MySQL eco-system

I think this is an excellent moment to learn new things and meet new people. If you’re in Madrid and are interested please come along.  More information can be found …

  [Read more...]
new to pstop – vmstat style stdout interface
+0 Vote Up -0Vote Down

In November last year I announced a program I wrote called pstop. I hope that some of you have tried it and found it useful. Certainly I know that colleagues and friends use it and it has proved helpful when trying to look inside MySQL to see what it is doing.

A recent suggestion provoked me to provide a slightly different interface to pstop, that is rather than show the output in a terminal-like top format, provide …

  [Read more...]
Updating MySQL on Ubuntu 12.04 LTS to MySQL 5.6
+0 Vote Up -0Vote Down

The Ubuntu 12.04.3 LTS release only provides MySQL 5.1 and MySQL 5.5 using the default Ubuntu package manager.

Oracle (owners of the MySQL(tm)) now provide Debian/Ubuntu APT repositories for all GA and DMR versions of MySQL including supporting Ubuntu 12.04.

The following steps demonstrate upgrading from the Ubuntu 5.5 server package to the Oracle 5.6 server package.

Verify MySQL Packages

$ apt-cache search mysql-server
mysql-server - MySQL database server (metapackage depending on the latest version)
mysql-server-5.5 - MySQL database …
  [Read more...]
Validating MySQL version numbers
+0 Vote Up -0Vote Down

As part of a MySQL 5.5 to MySQL 5.6 upgrade across several Ubuntu servers of varying distros an audit highlighted a trivial but interesting versioning identification error in Ubuntu’s packaging of MySQL.

Ubuntu 12.04 LTS

$ sudo dpkg -l | grep mysql-server-5.5
ii  mysql-server-5.5   5.5.41-0ubuntu0.12.04.1  ...
$ mysql -uroot -p -e "SELECT VERSION()"
+-------------------------+
| VERSION()               |
+-------------------------+
| 5.5.41-0ubuntu0.12.04.1 |
+-------------------------+

But when you look at the mysql --version it does NOT say 5.5.41.

$ mysql --version
mysql  Ver 14.14 Distrib …
  [Read more...]
Dynamic recreation of InnoDB redo logs
+0 Vote Up -0Vote Down

MySQL 5.6 will now automatically recreate the InnoDB redo log files during a MySQL restart if the size (or number) of these logs changes, i.e. a change to innodb_log_file_size. See Changing the Number or Size of InnoDB Log Files which states “If InnoDB detects that the innodb_log_file_size differs from the redo log file size, it will write a log checkpoint, close and remove the old log files, create new log files at the requested size, and open the new log files.”

Before MySQL 5.6 it was necessary to stop MySQL …

  [Read more...]
SQL, ANSI Standards, PostgreSQL and MySQL
+1 Vote Up -0Vote Down

I have recently been working with the Donors Choose Open Data Set which happens to be in PostgreSQL. Easy enough to install and load the data in PostgreSQL, however as I live and breath MySQL, lets load the data into MySQL.

And here is where start our discussion, first some history.

SQL History

SQL – Structure Query Language is a well known common language for communicating with …

  [Read more...]
Improving performance – A full stack problem
+1 Vote Up -0Vote Down

Improving the performance of a web system involves knowledge of how the entire technology stack operates and interacts. There are many simple and common tips that can provide immediate improvements for a website. Some examples include:

  • Using a CDN for assets
  • Compressing content
  • Making fewer requests (web, cache, database)
  • Asynchronous management
  • Optimizing your SQL statements
  • Have more memory
  • Using SSD’s for database servers
  • Updating your software versions
  • Adding more servers
  • Configuring your software correctly …
  [Read more...]
MMUG11: Talk about binlog servers at Madrid MySQL Users Group meeting on 29th January 2015
+1 Vote Up -0Vote Down

Madrid MySQL Users Group will have its next meeting on Thursday, the 29th of January.

I will be giving a presentation on the MySQL binlog server and how it can be used to help scale reads and be used for other purposes.  If you have (more than) a few slaves this talk might be interesting for you.  The meeting will be in Spanish. I hope to see you there.

Details can be found on the group’s Meetup page here: http://www.meetup.com/Madrid-MySQL-users-group/events/219810484/

…  [Read more...]
MMUG9: Madrid MySQL Users Group meeting to take place on 20th Noevember 2014
+0 Vote Up -0Vote Down

Madrid MySQL Users Group will have its next meeting on the 20th of November. Details can be found on the group’s Meetup page.

We plan to talk about pstop, which I’ve announced earlier and also the latest changes in MariaDB and MySQL since our last meeting.  The meeting will be in Spanish. I hope to see you there.

La próxima reunión de Madrid MySQL Users Group tendrá lugar el jueves 20 de noviembre. Se puede encontrar más detalles en la  …

  [Read more...]
pstop – a top-like program for MySQL (based on performance_schema)
+0 Vote Up -0Vote Down

I have been working with MySQL for some time and it has changed significantly from what I was using in 5.0 to what we have now in 5.6. One of the biggest handicap we’ve had in the past is to not be able to see what MySQL is doing or why.

MySQL 5.5 introduced us to performance_schema. It was a good start but quite crude. MySQL 5.6 gave us a significant increase in stuff that allows you to see what is going on inside MySQL. That’s great, except it’s hard to read, the documentation is good, but not oriented at the DBA but more at the MySQL developer (that’s what it seems like at least). So most of us have ignored it. Others …

  [Read more...]
Showing entries 1 to 10 of 1158 10 Older Entries

Planet MySQL © 1995, 2015, Oracle Corporation and/or its affiliates   Legal Policies | Your Privacy Rights | Terms of Use

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.