ddlgenerator

I've had it on github for a while, but I finally released ddlgenerator to PyPI.

I've been frustrated for years that there was no good open-source way to set up RDBMS tables from flat data files. Sure, you could import the data - after setting up the DDL by hand. ddlgenerator handles that; in fact, you can go from zero, setting up and populating a table in a single line. Nothing up my sleeve:


$ (more...)

My MySQL database impressions

I have been in the data and database world for over a decade now, working with mainly Oracle and data integration projects with Salesforce.

I have also spent time working with MySQL a relational database with open source roots, now part of Oracle. In this post I want to talk about my impressions of MySQL and some tips and tricks I learned working with it.

First and for all, you will have to be ready (more...)

JSON UDF functions version 0.2.1 have been released.

| Nov 28, 2013

Today new version of JSON UDF functions: 0.2.1 was released. This is maintenance release which added no new functionality and only contains bug fixes. However, it also includes improvements for build ans test procedures. As usual, you can download source and binary packages at MySQL Labs. Binary packages (more…)

RDBMS and their bundle-mates

Relational DBMS used to be fairly straightforward product suites, which boiled down to:

  • A big SQL interpreter.
  • A bunch of administrative and operational tools.
  • Some very optional add-ons, often including an application development tool.

Now, however, most RDBMS are sold as part of something bigger.

Configuring ODBC to MySQL from Oracle

Sometimes people want to connect to MySQL from Oracle and copy table data between the databases.  You can do that with Oracle Hetrogenous Services via ODBC.  This post will show how to create an odbc connection to your MySQL database which is the first part of this.

For my example, (more...)

Configuring MySQL on EL5, Setting Passwords and Network Access

I find myself installing and running mysql of different versions in different places for different reasons all the time (well often enough to do it and not remember the little things that cost time when setting up)   Its with that in mind, I'm making notes for myself and you (more...)

Using GET DIAGNOSTICS in MySQL 5.6

When Steven and I wrote MySQL Stored Procedure programming our biggest reservation about the new stored procedure language was the lack of support for proper error handling.  The lack of the SIGNAL and RESIGNAL clauses prevented a programmer from raising an error that could be propagated throughout a call (more...)

ipython-sql for multi-database comparisons

For my newest ipython-sql trick, I needed to compare some queries run across different databases. How hard would it be to get side-by-side results into tidy IPython Notebook output?

Not hard at all, it turns out, if you're willing to violate basic principles of human decency.

That's an itty-bitty image, (more...)

%sql to Pandas

After getting %sql magic for IPython working, my next big goal was to figure out how to get those results into Pandas.

Er, OK, not such a big goal. Even with zero Pandas experience, it took about five minutes of skimming the first page of documentation to figure out:


In (more...)

When to consider sharding a MySQL database

Uncategorized
| Mar 13, 2013

When to consider sharding a MySQL database

 

Why should you not just design your applications from the start to account for data sharding? Sharding a database, that is horizontally partitioning tables among multiple databases, creates an added level of complexity that is not desirable in an application. However, there are times when sharding is required to maintain acceptable performance. So when is the right time to shard your database?

 

When to consider sharding a MySQL database   Why should you not just design your applications from the start to account for data sharding? Sharding a database, that is horizontally partitioning tables among multiple databases, creates an added level of complexity that is not desirable in an application. However, there are times when sharding is […]

-->

The Three Major Areas of Difference Between MariaDB and MySQL

Uncategorized
| Mar 11, 2013

This entry and my next will be a little different from what I normally write. This info comes from some research I did recently into MySQL.

 

The Three Major Areas of Difference Between MariaDB and MySQL

 

An unresponsive web site is as good as asking your customers to leave. According to surveys, almost 50% of web users expect a page to load in less than 2 seconds, and 4

Reclaiming Space from Deleted Big Tables from MySQL

So, in my earlier post, I mentioned about a need of dynamically resizing (increasing) EBS volume on EC2. Here is how I landed in the situation. In the prototype, my database grew very high and I could not reclaim the innodb space of mysql even after dropping large tables or (more...)

Separate docs for MySQL Connectors

The MySQL documentation section has always had this Topic Guides page containing links to the docs for the various MySQL Connectors -- the official database drivers for various languages and programming technologies. That is the most convenient way to get the information for each Connector in PDF form, rather than downloading the entire Ref Man PDF. For HTML, it was more of a shortcut, because

A little “side-effect” of having autocommit off in MySQL

Back-story: A developer came to me and wanted explanation for a weird behavior in MySQL. They inserted a record (to InnoDB table), committed, and after receiving a message (on another application) tried to read that inserted record immediately, but the newly inserted record was not found. Problem only happened in production, but not always (quite frequently).

After comparing the MySQL parameter files between production and development environments I discovered that in production autocommit was disabled to make MySQL behave more like Oracle. This setting was removed from development after we rebuilt the environment (to use multiple MySQL instances with Oracle (more...)

DOAG Conference 2012 – Call for Papers

As every year the DOAG (German Oracle User Group) Conference will take place Nürnberg/Germany from the 20th November until 22nd November 2012.

The Call for Papers is already open and ends on 30th June 2012:

German Link: http://www.doag.org/de/events/konferenzen/doag-2012/fuer-referenten.html
English Link: http://www.doag.org/en/events/konferenzen/doag-2012/fuer-referenten.html

Once again, I (more...)

Book Review – High Performance MySQL 3rd Edition

Add to Technorati Favorites Ver este articulo en Español

This is THE MySQL performance book. Period!



Every chapter is very well crafted, with a precise balance between theory and practice, and full of invaluable nuggets, sometimes transcending the MySQL arena and applicable to any database! Such cases are Chapter 2-Benchmarking MySQL and Chapter 3-Profiling Server Performance, very solid foundations for the reading ahead.

All over the text, authors propose tools, examples of use and proven diagnostic techniques, that will greatly improve your performance firefighter skills and enhance your knowledge of MySQL internals. Nevertheless, what I liked the most from this book is taking into (more...)

For People That Have Managers

Interesting take on what managers are thinking: http://quickbase.intuit.com/blog/2012/01/09/10-things-your-boss-isnt-telling-you/

Clustering MySQL instances with Oracle Clusterware 11gR2

I've been doing lately quite many database clustering implementations; Oracle RAC and since we have many MySQL instances in production, had to find a good way to make MySQL instances highly available also.

One good solution for this is managing MySQL instances with clusterware and since we are planning to use Oracle RAC on Oracle Enterprise Linux anyway, then Oracle Clusterware is an excellent candidate for this task. Also... Oracle Clusterware is included with Oracle Enterprise Linux at no additional charge.

Requirements I had:

  • Multiple MySQL instances running in the same cluster, in case of node failure affected MySQL instances (more...)

MySQL Group By is a little too indulgent

After 30 years of Oracle, I've found myself using MySQL recently. I came across a little thing that surprised me. I'm by no means the first to trip over this - I found this 2006 post from Peter Zaitsey on the same topic.

MySQL lets you write a group by statement that references columns that aren't in the group by, and aren't aggregates. For example:

mysql> select table_name, column_name, count(*)
-> from information_schema.columns
-> where table_schema = 'information_schema'
-> group by table_name
-> limit 5;
+---------------------------------------+--------------------+----------+
| table_name | column_name | count(*) |
+---------------------------------------+--------------------+----------+
| CHARACTER_SETS | CHARACTER_SET_NAME | (more...)

Oracle Database on Amazon RDS

Recently, Amazon and Oracle announced that they are going to make "Oracle 11g Database" available on Amazon AWS as a service. It's being brought into AWS's RDS feature which currently offers "MySQL database as a service".

Amazon RDS is a web service that allows you to set up, operate, and scale a relational database in the cloud. You can provision a relational database (currently only MySQL) on RDS in just a few minutes. Amazon RDS will also manage database administration tasks including continuous backups, software patching etc.
When launched (sometime in Q2 of 2011), you will have the option to (more...)