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Do you guys know any free database hosting servers? most of the ones I came across required a license.
I'm trying to learn about databases and connection to databases using java JDBC, so I don't really have a project going to be worth paying for a database.
You should be able to use either PostgresQL or MySQL. Both are free (MySql does have commercial-use limitations, though).
Why not download Oracle XE or MySQL? - even though the database is on the same machine, the concepts are still the same when it comes to connecting via JDBC and other available architectures
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I want to know what are the different techniques & tools used for database versioning and migration. I am also interested in saving a snapshot of the data along with the schema changes. Would that be a good practice?
I have come across tools like alembic and sqitch, although I haven't used either. I have around 200 table in PostgreSQL.
Thanks
Read about using Liquibase with PostrgeSQL
Ask you DBA to create data- (or full) dumps, which you store with ALTER-dumps of Liquibase
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I'm looking for a DB embedded solution to deal with a average/medium amount of data (maybe between 100MB to 2GB), and allow concurrent connections, not so much, I believe at least
more than 10 concurrent connections for objects (database, tables) up to fifty or one hundred.
Which options could be achieve these requirements in your opinion and experience?
Firebird can be used embedded. It meets all your other requirements.
For Java you have a choice of three different DBMS:
HSQLDB (aka HyperSQL): http://hsqldb.org
H2 Database: http://h2database.com/html/main.html
Apache Derby (aka. "JavaDB"): http://db.apache.org/derby/
My personal preference is HSQLDB, but H2 is just as good. Both meet the requirements you mentioned.
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Supports C API for reading and writing into the DB.
Support ACID transaction feature.
Support sending notifications if any change happens to DB state.
Finally it should be an open source.
Could someone suggest a open source database which supports all these above features.
Postgres supports those features.
I don't think I understand what you refer to in #3. If you mean triggers, CUBRID could also do the job.
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I'm looking for oracle admin tool like SQL Buddy (here). I just want to use the browser to test my querys.
For just to test querys you can try iSQL (but it is deprecated in 11g)
or may be look to http://www.oracletool.com/
You could try using APEX. It isn't specifically an admin tool (more for power-users/developers), but it is built-in on newer databases. You can write SQLs, build packages and procedures, view and filter data, etc.
While not web based I would suggest Oracle's (free) Sql Developer http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
or (also free/OSS) Squirrel:
http://squirrel-sql.sourceforge.net/
The best for me is SQLTool (http://www.sqltools.net/), it´s free, faster, easy to use and has a lot of option.
Although they're not web-based, I like toad and sqldeveloper. The former is commercial software, but very good - the latter is currently free (but long-term....?).
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currently i use db visualiser for connecting the netezza database. can you suggest any otehr alternative (freeware) for the same.
Check out Aginity Netezza Workbench www.aginity.com.
I haven't found anything better than DBVis. Make sure you are using the loaded JDBC drivers for netezza instead of the ODBC data source.
I broke down and got the paid version. very good stuff. You can run multiple query windows and explorers at once.
Other software includes RazorSQL or any number of other softwares like SQLassistant, SQLdeveloper, etc can be setup to run against netezza.
You should try using this project.