what is the difference between apache cassandra and hbase and mongodb? [closed] - nosql

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Closed 10 years ago.
I have been reading about the NoSQL databases for the last little while and i was just wondering what is the difference about Apache Cassandra and hbase and mongodb?
After i asked a friend he told me that Cassandra is an engine and not a database is that true?
Thanks in advance

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Database administration tool for MongoDB [closed]

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Closed 10 years ago.
I'm kinda confused. MongoDB is one of the most popular DB. Is there any DB administration tool available for MongoDB like MySQL workbench or [localhost web based] PHPMyadmin.
I'm on windows 7 machine.
The mongo documentation has some suggestions:
http://www.mongodb.org/display/DOCS/Admin+UIs
Fang looks interesting

startup project for learning mongo db [closed]

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Closed 10 years ago.
I want to learn mongodb.
what could be a simple project as a start to learn MONGODB??
Please provide your views.
Thank You.
Check 10gen's websites (mongodb.org and 10gen.com) for tutorials and use cases. Either of these might be good to start with:
https://www.10gen.com/presentations/mongodb-stockholm/2012/building-your-first-mongodb-application
http://docs.mongodb.org/manual/tutorial/write-a-tumblelog-application-with-django-mongodb-engine/

difference between oracle 11g and 10g and 9i-detailed comparison [closed]

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Closed 10 years ago.
Can anyone help me understand the detailed difference between the various version of oracle db. I am not looking for vendor differences but objective differences here. Any links or site or book to understand.
Sujatha
The 'i' and 'g' part of the version name just represents either "Internet" or "Grid".
New features in Oracle 9i:
http://www.orafaq.com/wiki/Oracle_9i#Features_introduced
New features in Oracle 10g:
http://www.oracle-base.com/articles/10g/articles-10g.php
New features in Oracle 11g:
http://www.dba-oracle.com/oracle11g/oracle_11g_new_features.htm

Tool/s to monitor a MongoDB Cluster [closed]

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Closed 10 years ago.
What tool/s do you recommend using to monitor a MongoDB cluster with sharding and replica set enabled? I prefer a tool which can report on MongoDB cluster internals and not just generic stuff?
MMS is good and there is a list of others here.
Mongostat is your friend here:
http://www.mongodb.org/display/DOCS/mongostat

Recommend books about web server architecture or technique [closed]

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Closed 11 years ago.
I'm looking for an book which presents how does a web server work. For example, I want to learn how Apache works and its architecture.
Thank you very much