We had a great time meeting with folks from the industry and are excited about the innovations being pursued by the community and various companies.
Videos of our keynote panel participation and talks are available now.
Percona Live 2015 Keynote Panel discussion - Ritesh Chhajer
High Availability using Percona XtraDB Cluster - Trey Raymond & Yashada Jadhav
MySQL Performance Analyzer - Xiang Rao & Ashwin Nellore
…
This Log Buffer Edition covers Oracle, SQL Server and MySQL blogs of the running week.
Oracle:
MySQL India team is back with another MySQL user camp.
The day of the week, time and venue remains the same:
Date: Jun 26th, 2015
Day : Friday
Time: 3-5:30 pm
Place: OC001, Block1, B wing, Kalyani Magnum Infotech Park, J.P Nagar, 7th Phase Bangalore, India
During our previous meetings we were requested by our attendees that they would like to hear about implementation of GTID by the MySQL community. We have listened to you and requested a community member to talk about their experience with the implementation of GTID. Our first talk is :
There is also a lot of interest in our new delivery vehicles for MySQL packages. Using the new YUM repos you can stay up to date with the latest MySQL releases. You need not wait for your distro to update MySQL in their release …
[Read more]Goodies… but not the kind you can eat
You’re probably wondering, “What does this dandelion picture have to do with dates?” I wondered the same thing when I typed “calendar” into the image search box. Forget the dandelion. Let’s talk date table fun. On to the “goodies” I promised.In case you missed it, I posted earlier about the wonder of a “dates” table (Dates Tables (More Numbers Table Sugar)) I said I would probably make posts about why it is so wonderful. I like to deliver on what I promise.
Since the previous posts use MySQL, this will also use MySQL syntax in places. Considering how prevalent it is I’m sure not many people will complain.
For those who want to complain, you may insert into this table I
created:
CREATE TABLE complaints ( complaint_id int unsigned auto_increment, …[Read more]
Hooray for Data Structures… Where Are They?
The Key-Value Pair is my favorite programming tool. Most SQL type databases lack this feature in it simplest form. Some would argue, “Well that’s because databases don’t need dah-blah-dee-blah-blah…” Well, if they don’t need it I don’t need to write this post. :p
How many times have you found yourself asking “Why isn’t there at least simple array support!?” When you don’t want the overhead of creating a table, or a temporary table, simple data structures really do come in handy (hint, hint, nudge, nudge to all the companies producing database software with stored routine support).
I’m not one to let an apparent lack of functionality ruin my day. Instead, I add it. I had a great computer science professor who said “You don’t need pointers to create a linked list.” Then he proved it. You can create, pretty much, any abstract data structure with …
[Read more]Why A Table of Dates?
I thought it would be nice to build on the numbers table with another very useful tool.
Dates are pretty important–especially if you are playing with data warehousing. Not only dates, but all the different properties and derived goodies contained within them. You really don’t need a dates table, unless you care about efficiency and getting to all the good stuff quickly. Perhaps I’ll showcase some of the “goodies” in later posts.
Sure, most databases have built-in functions to get everything you might want. But do you really want all the inefficiency that comes with calling functions and doing calculations over and over again? I hope not. I used the method in this article when I developed a SQL Server data warehouse for a company I worked for. It was adopted by our other SQL Server guru for all the date-sensitive stuff we did (which was a lot). It increased efficiency by leaps and …
[Read more]Making The Numbers Table Useful
It’s not easy to find a solution to a very simple problem in MySQL: converting a comma separated list of values into rows. Oracle database users find gobs of tutorials on using REGEXP and CONNECT BY LEVEL to make this happen. MySQL doesn’t have that. So, use the numbers table from the previous post!
The transposing is made possible by (ab)using the SUBSTRING_INDEX function. I love this function. It is right up there with GROUP_CONCAT when mixing NULL and non-null strings.
I will be using comma separated values. You can use any delimiter character you like.
Bonus: This works with empty strings, strings with one value only, and empty delimiters (i.e. “my value,,previous is empty”). No extra code needed.
Making Magic Happen
SET @mycsv = …[Read more]
Why You Care About Numbers
I have worked a bit with Oracle. As such, I hang out around Oracle developers. There seems to be a common complaint among our kind when it comes to MySQL–”There aren’t any sequences!”
It never really bothered me. I wasn’t always an Oracle guy, so I didn’t always have sequences. I’m the kind of person who likes to experiment and make things happen. It just so happens there is a nice tool to help with this perceived absence: the “numbers table.”
It is really easy to set up. And, regardless of your database background, I think you will grow to love your utility.
There are multiple ways to achieve the result you want. For me, the easiest way is to work with decimal numbers. Why? Because that’s how we think. That’s pretty much standard for humans. Yeah, I know. Geeks think hexadecimal. Let’s not go there.
Without further ado, here is how you can create …
[Read more]TEXT fields are a nightmare. For you and for your server. It is slow to retrieve, and if you are doing searches on it, be prepared, things are going to get bumpy.
If you use MySQL with a MyISAM engine, this may not be an issue
for you, you can create a FULLTEXT index, your only
problem is if you want to add a new column, an alter table can
take forever, since MySQL creates a new table and copies the old
data to the new table. For those who uses MySQL with an InnoDB
engine, prepare because, you’ll have more issues. Indexes
can’t be FULLTEXT and if you do
need an index you must inform the length of it. It defeats the
purpose of you doing the search in that field.
The observation above is only true for MySQL 5.5
or below, since version 5.6 MySQL does support
FULLTEXT indexes on InnoDB – thanks Davey …
I am potentially one of the least technical people in my generation. I’m 30 and I am afraid of my cellphone, my laptop, Netflix, the microwave…. Okay, afraid is maybe a strong word, but baffled by them at the very least.
In high school, while my classmates wrote most of their papers and assignments on the computer, I insisted on writing everything out by hand and only typed it out afterwards if absolutely required. It wasn’t that I had issues with typing – my mom who worked as an administrator for many years made sure that I learned to type from a very young age and I type quickly with a reasonable amount of accuracy. I just felt that writing by hand kept me more “connected” to the words I penned. Simply, my name is Sarah and I am a Luddite.
After high school I studied journalism for a couple of years and then entered the workforce into a number of different jobs, such as in sales and marketing and it became necessary …
[Read more]