Great reading: studying material for Sun' SCJP by Sybex

I have started to read book SCJP: Sun Certified Programmer for Java Platform Study Guide: SE6 (Exam CX-310-065). This reading is great for huge spectrum of programmers, even senior java one has to find places where he can gain new knowledge. I had to continue reading SCJP book despite I'm currently working on project having .NET behind. It helped me to understand stuff "behind the wall", what compiler allows, how works inheritance. The book covers all materials likely using within technical interviews :-) You couldn't be caught so easy :-)

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Performance Battle of NoSQL blob storages #1: Cassandra

Preface We spend last five years on HP Service Virtualization using MsSQL database . Non-clustered server. Our app utilizes this system for all kinds of persistence. No polyglot so far. As we tuned the performance of the response time - we started at 700ms/call and we achieved couple milliseconds per call at the end when DB involved - we had to learn a lot of stuff. Transactions, lock escalation , isolation levels , clustered and non clustered indexes, buffered reading, index structure and it's persistence, GUID ids in clustered indexes , bulk importing , omit slow joins, sparse indexes, and so on. We also rewrite part of NHibernate to support multiple tables for one entity type which allows use scaling up without lock escalation. It was good time. The end also showed us that famous Oracle has half of our favorite features once we decided to support this database. Well, as I'm thinking about all issues which we encountered during the development, unpredictive behavio

NHibernate performance issues #3: slow inserts (stateless session)

The whole series of NHibernate performance issues isn't about simple use-cases. If you develop small app, such as simple website, you don't need to care about performance. But if you design and develop huge application and once you have decided to use NHibernate you'll solve various sort of issue. For today the use-case is obvious: how to insert many entities into the database as fast as possible? Why I'm taking about previous stuff? The are a lot of articles how the original NHibernate's purpose isn't to support batch operations , like inserts. Once you have decided to NHibernate, you have to solve this issue. Slow insertion The basic way how to insert mapped entity into database is: SessionFactory.GetCurrentSession().Save(object); But what happen when I try to insert many entities? Lets say, I want to persist 1000 libraries each library has 100 books = 100k of books each book has 5 rentals - there are 500k of rentals It's really slow! The inser

Presentation: Redis - The Distributed Key:Value Store

Attaching presentation I made for my colleagues regarding Redis - The distributed key:value store. Google docs version .

Martin Podval' Streamlog

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