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 and remove the InnoDB log files manually before restarting MySQL.

The error log shows:

tail -f /mysql/log/error.log
...
2015-03-28 21:51:25 3767 [Warning] InnoDB: Resizing redo log from 2*3072 to 2*65536 pages, LSN=1626017
2015-03-28 21:51:25 3767 [Warning] InnoDB: Starting to delete and …

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 Relational Databases (RDBMS). It is not the only language I might add, having both used many years ago and just mentioned QUEL at a Looker Look and Tell event in New York. It …

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
• … And the general checklist goes on

Understanding where to invest your energy first, knowing what the return on investment can be, and most importantly the measurement and verification of every change made is the difference between blind trial and error and a solid plan and process. …

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 … Continue reading MMUG11: Talk about binlog servers at Madrid MySQL Users Group meeting on 29th January 2015

The post MMUG11: Talk about binlog servers at Madrid MySQL Users Group meeting on 29th January 2015 first appeared on Simon J Mudd's Blog.

I had an enjoyable time last night at Twitter with local MySQL DBAs and developers. We had an attendee who has no experience with SQL or programming at all. She is interested in organizing her collection of recipes and had heard a rumor that MySQL was a good tool to use for this task. She indicated that her desktop runs Windows 7. I think I’m going to encourage her to turn her concept in to a community project, as she is not the first person I’ve met who wants to organize recipes!

We were hosted by Rob at Twitter, who used to work with Lisa back before she retired. He’s a member of the site reliability team and keeps the fail whale from rearing its blubbery head.

Pizza was provided by my dear friend and long-time open source buddy Gerry Narvaja with the assistance of the folks in the kitchen at Zeek’s.

We discussed new techniques in the areas of load …

Madrid MySQL Users Group will have its next meeting on Tuesday, the 18th of December. Details can be found on the group’s Meetup page here: http://www.meetup.com/Madrid-MySQL-users-group/events/219081693/.  This will be meeting number 10 of MMUG and the last meeting of the year. We plan to talk about MySQL, MariaDB and related things. An excuse to talk about our … Continue reading MMUG10: Madrid MySQL Users Group meeting to take place on 18th December 2014

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 … Continue reading MMUG9: Madrid MySQL Users Group meeting to take place on 20th Noevember 2014

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 … Continue reading pstop – a top-like program for MySQL (based on performance_schema)

A very old post of mine in 2009, MySQL’s stored procedure language could be so much more Useful suggested that it would be nice if MySQL could be adapted to use compound statements directly from the command line in a similar way to the language used for stored procedures. I’ve just seen that this seems to … Continue reading MariaDB 10.1 Brings Compound Statements

With the upcoming release of MySQL 5.7 I begin to see a problem which I think needs attention at least for 5.8 or whatever comes next. The GA release cycle is too long, being about 2 years and that means 3 years between upgrades in a production environment More people use MySQL and the data … Continue reading Making MySQL Better More Quickly