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Actually we have been asked not to use open source databsae. So, Now I have to use proprietary database. Now my doubt is What is best equivalent Proprietary database of postgresql and also it should be cost effective.
Please give some suggestion
The decision maker here has some weird ideas - specifically not open source, but they don't care what you use so long as you don't have the source code? That's nuts.
Maybe they don't understand open source licenses and are confusing GPLv3 with the simple BSD/MIT-like license PostgreSQL is under? They might have images of "open source" meaning some kind of terrible viral license that takes all their patents and forces them to open source all code that it touches (which isn't true even of GPLv3, btw). Try sending them the wikipedia article, FreeBSD's article on the license, and that of OpenBSD. They should also read the OSI FAQ. If they're still determined to waste their money after reading that and doing a little basic research, there's no saving them.
In that case, I would take the PostgreSQL source code, rename it "ProprietaryDB", whack on a restrictive all-rights-reserved license, and sell it to them for $5000/server for a perpetual license. PostgreSQL is under a BSD-like license and you're permitted to do this so long as you don't delete the copyrights from the sources or claim you wrote it. I'll gladly do this for you for as little as $4000/server, a real bargain ;-)
More seriously, there are quite a few proprietary PostgreSQL forks already, notably:
ParAccel
Greenplum Database
EnterpriseDB Postgres Plus Advanced Server
... and Amazon will sell you a ParAccel based DB as a service, Redshift, too.
Amazon RDS PostgreSQL is arguably a closed source fork too, though it tracks mainline PostgreSQL closely and there doesn't seem to be much real difference if any.
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I know it's not exactly the right place for such a question, but I've seen similar questions to this here, and I don't know any other place where I could ask this, so sorry in advance.
Do you know where I could find a public 3270 server ? I'm working on a telnet emulator and I need one of these servers to test it.
Thanks for your help !
The biggest issue you will face, is not the TELNET/TN3270 part itself, but rather interpreting the 3270 data stream. Anyway, here are some options for you:
efglobe.com provides a public access z/OS system for personal use only. Ask them
on their forum about the kind of testing you intend to perform, to see whether they are
okay with it.
With MVS Turnkey, you can install MVS 3.8J (for which IBM apparently does not
claim copyright) under Hercules emulation. This dates to 1981, so likely lacks newer
protocol innovations since then, but could help you get the basics of the 3270 protocol
right. (MVS 3.8J lacks a TCP/IP stack, so it doesn't directly support TN3270, but
Hercules accepts TN3270 connections and makes them appear as a physical 3270 to MVS.)
IBM will sell you a mainframe emulator running latest IBM mainframe operating
systems on x86 hardware. It will cost you several thousand dollars a year though.
Many institutions used to offer public TN3270 access to library catalogues, but as most libraries have moved off the mainframe, most or all of those seem to have disappeared. In any case, using someone else's system for testing without their knowledge/permission could be ethically and/or legally questionable. You'll still find various organizations have non-public 3270 systems exposed to the Internet, but you won't get past the login screen, and the same comment about legality/ethics applies.
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I am new to database schema design and I want to learn more about how a well-designed database scheme is implemented in the real world?
Is there any places to find those schemes? Or is there any book focused on explanation over examples.
DatabaseAnswers.org (unfortunately now defunct) but well-preserved in the Wayback Machine is a great source of example database schemas.
I can also recommend Beginning Database Design, published by Apress. I own this book and can confirm that it is of high quality. The book looks at a number of real world scenarios and explains the impact a certain design decision could have on the way the database works and the quality of the data and its output.
Finally I would advise building some small databases (E.G. contact management, Task list etc). Start by specifying some basic requirements and create some tables and queries. You WILL make some mistakes which is the best way of learning.
Here is a nice library of schemas to browse through.
http://www.databaseanswers.org/data_models
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We have grown from a small time of 2-3 developers to about 30 developers very quickly. We supposedly never needed Source Control, or Db Monitoring or Schema diagrams.
Now we see more and more terrible code being moved to the Production. Is there an off the shelf product for oracle that will help manage version control and deployment management from Test, to UAT, to Prod?
Also nice to have would be Schema diagrams, Documentation Tools, some amount of performance profiling capabilities. But primarily would like to a tool to manage code source control and Migration for oracle scripts, DDL, DMLs etc.
I srongly recommend getting Oracle'e SQL Developer. This integrates with Subversion, provides an overview of the entire database, including procedures, schema changes and so on. This will make your life easier.
have you considered SVN for your source control and management of scripts, DDLs and etc? Our ORACLE DBAs use it here and they swear by it.
I know I am very late to this party, however, I wanted to draw your attention to our product, dbMaestro TeamWork for Oracle, which provides exactly the functionality required here. We offer the functionality equivalent to source control tools for Oracle artifacts. Many companies use SCM by proxy (as suggested above by northpole, re using SVN), our solution is "in touch' with the database as required by Reuben on the original post. To read more please visit our site at http://www.dbmaestro.com or e-mail us at info#go-esi.com.
Disclosure - My company represents this product in the US.
TOAD (by Quest Software) is fantastic and includes most of what you want including source control.
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Does any one know of a good text to speech library. It needs to be open source and provide C API?
PS: I've already done a search, but I'd like recommendations from people who have actually used these APIs
Festival is an open source text-to-speech system.
Stanford uses it for their Natural Language Processing class, and they have up-to-date instructions about installation on this cs224s homework page. Installation on Mac OS X requires a couple patches, which they've wrapped into a handy install script.
There are alternate voices you can use which sound noticeably better than the stock ones. You can find information on these voices in this forum post:
How to setup more realistic voices in Festival. Those instructions are for Ubuntu, but the voices work with any Festival installation.
you can go for Festival worked nice for me.
I have used flite in an embedded server. It has a small footprint and comes with a single voice
eSpeak is another lightweight TTS. More robotty than Festival.
Hey what about MARY?
It looks so awesome to me which one should we push further for open source enterprise computer or androids or whatever? We need to strenghten efforts by shifting all open source resources to the best/most promising we have so far.
Anyone experiences with MARY TTS? Or does it have a flaw (because noone mentioned it before)?
More links:
http://www.babelfish.org/tts-free.htm.
https://www.cereproc.com/en/support/live_demo
http://www.digitalfuturesoft.com/dfttssdk.php (also provides ARM version, like MARY + Festival)
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How do I create a database management system from scratch? Are there any books, sites and tutorials with great quality?
With great quality I mean that it should be simple to use and straight forward in explaining the concepts.
Here are examples of caliber quality resources that I'm looking for:
If I were to create an operating system from scratch, I would consider studying MINIX 3.
If I were to create a compiler from scratch, the famous dragon book Compilers: Principles, Techniques, and Tools is a good one.
It would be great if there are working sample of source code available in C or any programming language close to C that would to justice to the task.
"Database Management Systems" by Ramakrishnan and Gehrke.
http://pages.cs.wisc.edu/~dbbook/
The first part is an intro to data modeling, SQL, etc, but it goes very deep into the design of internals in the second half (including transaction control, locking, logging, storage management, ACID guarantees, and so on).
In terms of studying internals, there is educational software called MiniBase, also from Wisconsin, but I'd just start looking at Postgres internals instead. Very clean, does a lot, does a lot right.
The academic textbooks on relational database design are:
An Introduction to Database Systems - C J Date
Database Systems: A Practical Approach to Design, Implementation and Management - Thomas Connolly
Either of these are a good place to start regarding the theory.
I would also add C J Date's other book - Date on Database