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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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

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

Git on Windows: MSysGit

I have started to use Git today. I read a lot of discussions that there is no good tool for Windows platform. After forethought I have decided to used TortoiseGit . I also feared of difficult work related with Git as a lot of articles mentioned many instructions. As I already said, I have decided to use TortoiseGit, because I'm used to work with TortoiseSvn, but for start, MSysGit is enought. So this article is about MSysGit , next will be about TortoiseGit . How to start with MSysgit on local machine? Download and install Git for Windows Create source code directory for your git app Right click the directory at your favorite file browser. Menu should contain item "Git init here". It initializes chosen directory to be git-abled :-) It was your first usage of Git. Commit data to local Git repository Now, you can add any file, your first source code, to created directory. If you are prepared to commit any changes to your local git repository, follow next instruc

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