As many know, I have been working within the Espresso team at LinkedIn since 2012. Espresso is a schema-ed document store built upon MySQL.
Introducing Espresso - LinkedIn's hot new distributed document store
We eventually hope to open-source a version of Espresso which doesn't use LinkedIn's internal proprietary APIs.
We want you to learn as much as possible during the three days of conference. We do that through quality and variety of both content and speakers, as well as creating a fun and friendly atmosphere.
We have presentations for any level, from beginner to advanced. You’ll learn about the backend and frontend, web and mobile, information systems and games, hard and soft skills, as well as many related topics.
We have speakers from many different countries and industries. They brings unique perspectives that you won’t find in your backyard. How often will you talk tech with someone from Taiwan or Saudi Arabia? How often will you learn from people who build robots or write their own programming language?
If your goal is to learn and meet interesting people, then ConFoo is the conference for you! Take advantage of our $190 early bird …
[Read more]First of all, Happy New Year!
IEEE Spectrum published a ranking of the most popular programming languages. Computational journalist Nick Diakopoulos wrote the article. While it may surprise some, I wasn’t surprised to find SQL in the top ten.
Nick weighted and combined 12 metrics from 10 sources (including IEEE Xplore, Google, and GitHub) to rank the most popular programming languages.
“HBase and Hadoop are the only technologies proven to scale to dozens of petabytes on commodity servers, currently being used by companies such as Facebook, Twitter, Adobe and Salesforce.com.”–Monte Zweben.
Is it possible to turn Hadoop into a RDBMS? On this topic, I have interviewed Monte Zweben, Co-Founder and Chief Executive Officer of Splice Machine.
RVZ
Q1. What are the main challenges of applications and operational analytics that support real-time, interactive queries on data updated in real-time for Big Data?
Monte Zweben: Let’s break down “real-time,
interactive queries on data updated in real-time for Big Data”.
“Real-time, interactive queries” means that results need to be
returned in milliseconds to a few seconds.
For “Data updated in real-time” to happen, …
It's been almost a year now since the initial release of MySQL Fabric. It is maturing and reached a GA state earlier this year as part of MySQL Utilities 1.4. Developers and architects are evaluating it for their applications, learning the capabilities of the system, and providing feedback for future features and usability enhancements. Connector/J has supported Fabric from the very beginning and continues to support the latest features. This blog post is an introductory level guide to using Fabric for high-availability from Java applications. Sharding features and Java APIs will be covered in a later post. The commands shown and feature descriptions are current for Fabric 1.5.1. In addition, Connector/J 5.1.32 and later support only Fabric 1.5 due to communication protocol differences from Fabric 1.4.
High-availability is a core concept in Fabric and is implemented by HA groups. An HA group is a set of servers configured with MySQL …
[Read more]ConFoo is currently looking for web professionals with deep understanding of PHP, Java, Ruby, Python, DotNet, HTML5, Databases, Cloud Computing, Security and Mobile development to share their skills and experience at the next ConFoo. Submit your proposals between August 25th and September 22nd.
ConFoo is a conference for developers that has built a reputation as a prime destination for exploring new technologies, diving deeper into familiar topics, and experiencing the best of community and culture.
What do the acronyms I18N or L10N stand for? What do they mean for developers of mobile applications in particular?
I hosted a session about localizing mobile applications at Developer Week 2014 in Nuremberg. It covers — among other things — text, numbers, date and time, images, and other localizable resources.
See the codecentric blog for slides and some more details.
The post and the slides are also available in German.
“There are four things that motivate open source
development teams:
1. The challenge/puzzle of programming, 2. Need for the software,
3. Personal advancement, 4. Belief in open source” — Bruce
Momjian.
On PostgreSQL and the challenges of motivating and managing open source teams, I have interviewed Bruce Momjian, Senior Database Architect at EnterpriseDB, and Co-founder of the PostgreSQL Global Development Group and Core Contributor.
RVZ
Q1. How did you manage to transform PostgreSQL from an abandoned academic project into a commercially viable, now enterprise relational database?
Bruce Momjian: Ever since I was a developer of database …
[Read more]
The Oracle Database 12c documentation says you can set
the maximum size of a VARCHAR2 to 32,767 bytes.
That’s true except when you’re trying to map a large Java string
to a VARCHAR2. It fails when the physical size of
the Java string is greater than 4,000 bytes with an
ORA-01002 or fetch out of sequence error.
SELECT read_text_file('C:\Data\loader\Hobbit1.txt')
*
ERROR at line 1:
ORA-24345: A Truncation or null fetch error occurred
ERROR:
ORA-01002: fetch out of sequence
|
You need to grant privileges before you can test this code. You
can grant privileges by connecting as the SYS user
of a CDB (or non-multitenant database) or as the ADMIN user of a
PDB with the AS SYSDBA clause. Then, you run the
following command to grant external file access to the JVM inside
Oracle Database 12c:
Today marks the release of several exciting pieces of software from Oracle. In addition to MySQL server 5.7.4 DMR, MySQL Fabric is out as a release candidate 1.4.2 and Connector/J 5.1.30 has full support. MySQL Fabric is a new way to implement high-availability and scale-out with MySQL server. It provides a way to group sets of servers into high-availability groups with automatic replication configuration. If scale-out is important, sharding can be defined in terms of these high-availability groups.
To use Connector/J with Fabric, you only need to add the jar to your classpath. If you are still using Java 5, you will need to manually load the com.mysql.fabric.jdbc.FabricMySQLDriver class to register the driver. Fabric-aware connections are made with a JDBC URL of the form jdbc:mysql:fabric://host:port/db. Several connection properties are available to influence the behavior of Fabric-aware connections. You can find the documentation for …
[Read more]