Timeout records – Feature request

For several years now, I’m yearning for a feature that I think that all SQL based databases that I know are missing, and throw it back to the program side.

The feature I wish to have is a way to set a specific record to be valid for only a known period of time, and when the time is up, I’ll be able to do something.

In this post I’ll try to create some sort of general specification for such feature, and I hope that there will be many comments on this that will benefit everyone, and I hopeful, that they will make the idea better.

Firebird: choosing an owner for database deployment

Like most users when I started using Firebird I connected using the SYSDBA username. That is the default username for server administration: every server has it.

It looked like a good idea because I did not have to care with users management, but I have now realized that using SYSDBA for database development can cause problems when the database is deployed to the customer’s computer.

Read the rest on Accounting++ blog

The bleak future of SSD drives

The technology trends we have described put SSDs in an unusual position for a cutting-edge technology: SSDs will continue to improve by some metrics (notably density
and cost per bit), but everything else about them is poised to get worse. This makes the future of SSDs cloudy: While the growing capacity of SSDs and high IOP rates will make them attractive in many applications, the reduction in performance that is necessary to increase capacity while keeping costs in check may make it difficult for SSDs to scale as a viable technology for some applications.

Not good news, specially for those thinking about using the for critical work, like database servers.

Read full research here (in English). Short article in portuguse here.

Kitto – A framework for creating data-driven web applications with Delphi and ExtJS

Kitto allows to create Rich Internet Applications based on a data model that can be mapped onto any database. The client-side part uses ExtJS (through the ExtPascal library) to create a fully AJAX application, allowing you to build standard and advanced data-manipulating forms in a fraction of the time.

Kitto is aimed at Delphi developers that need to create web application without delving into the intricacies of HTML, CSS, Javascript or learning to use a particular library such as ExtJS, yet it allows access to the bare metal if required.

Kitto includes a database-agnostic data-access layer, allowing to create applications that work on any database engine and port applications between database engines.

A Kitto application is described in a set of easily maintained YAML files, keeping definitions abstract and declarative and allowing for future extensions. Business rules are enforced either declaratively or through small javascript fragments on the client, or in Delphi code on the server.

Kitto was designed by Nando Dessena and its development is sponsored by Ethea, which uses Kitto for internal development projects and client work and provides Kitto-related tools, support and development services.

Start here for further information.

The getting started guide can be tested with Firebird and Delphi

 

Firebird on Large Big Iron servers : 512G-2TB of ram 100.000 concurrent users

Nikolay Samofatov wrote about his Large Iron production systems that he maintains :

We run Firebird to power larger systems (for 12 government agencies and 3 banks).

It has approximately 100000 end users multiplexed through 2500 (max) pooled connections.

Here is the snapshot of nearly idle system at night:

top - 03:20:39 up 10 days,  8:39,  7 users,  load average: 2.08, 1.87, 2.15
Tasks: 1732 total,   1 running, 1730 sleeping,   1 stopped,   0 zombie
Cpu(s): 11.9%us,  4.0%sy,  0.0%ni, 83.5%id,  0.0%wa,  0.0%hi,  0.6%si,  0.0%st
Mem: 529177288k total, 378587600k used, 150589688k free, 761532k buffers Swap: 1073741816k total, 130612k used, 1073611204k free, 333281232k cached

[root  mvv bin]# ps aux | grep -c rdb_inet_server
719

Database is on a small FusionIO drive:

mount:
/dev/fiob on /mnt/db type ext2 (rw,noatime)
df -h:
/dev/fiob             587G  423G  135G  76% /mnt/db

Also later he mentions that he uses 2TB of RAM machines

Chipsets that can handle 2 TB of RAM and 8 CPU sockets (<=80 cores, <=160 threads) are the largest “commodity” type hardware available now. These are the largest systems we worked on. 8 GB of lock manager space per database should be just enough for them. With the allocation error check in place we’ll have this problem solved for the next year or two until larger systems become common.

InfoQ: Q&A with Jiri Cincura of the Firebird Database Project about the ADO.NET provider , ORM ,EF …

Jiri Cincura was recently interviewed for InfoQ article – Q&A with Jiri Cincura of the Firebird Database Project. We touched Firebird, ADO.NET, O/RMs, Entity Framework etc. If you have any questions, feel free to ask.

Update: The article seems to be retracted for the moment , Don’t panic we asked why and investigate the cause (see the comments section) ,

Here is the full text from Google cache

We recently spoke with Jiri Cincura of the Firebird database project.

InfoQ: Can you tell us briefly about yourself and your role in creating the ADO.NET provider for Firebird?

Jiri: Currently I’m project lead for the ADO.NET provider for Firebird project. And actually only one active right now. I’m doing majority of development (although there are some worth contributions) and all the stuff around, like testing, releases, issue tracker watching, replying in mailing list etc.

InfoQ: And for the benefit of our readers who are unfamiliar with it, who would you describe Firebird?

Firebird speed RUBY vs DELPHI vs .NET

From http://ramsees.blogspot.com:

I did some comparitions selecting 1000, 10000 and 100000 with Ruby Fb gem, Delphi Fibplus and the FB .NET driver, here is the result:

ROWS RUBY DELPHI .NET
1000 0.12 0.47 0.09
10000 0.94 0.48 0.53
100000 10.95 3.79 5.53

The results are on milliseconds, the table is from a production database with 40 fields and about 3 million records, as you can see, native code is still the king, .NET result are quite good, but Ruby is quite dissapointing handling lots of data.

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