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Published on 2010-04-14T04:45:19Z
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2010/04/20
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There has been a lot of talk related to Cassandra lately.
Twitter, Digg, Facebook, etc all use it.
When does it make sense to:
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When using the Perl module Net::Cassandra::Easy to interface with Cassandra I use the following code to read colums col[123] from rows row[123] in column-family Standard1:
my $cassandra = Net::Cassandra::Easy->new(keyspace => 'Keyspace1', server => 'localhost');
$cassandra->connect();
my…
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In Cassandra, I have the following Column Family:
<ColumnFamily CompareWith="TimeUUIDType" Name="Posts"/>
I'm trying to insert a record into it as follows using a C++ generated function generated by Thrift:
ColumnPath new_col;
new_col.__isset.column = true; /* this is required! */
new_col…
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I wrote a shell script that runs on remote host to build source code with 'ant build' command, and then distribute the built binary to other servers.
However, right after Ant build is over successfully(I can see the command line output saying Build was successful), the ssh session ends and whatever…
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I'm not managing to connect to cassandra from outside machines. The database is hosted on a windows machine and im trying to connect through a mac (but this shouldn't cause problems)
Local connection works:
C:\cassandra\bin>cassandra-cli
Starting Cassandra Client
Connected to: "Test Cluster"…
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The following is a complete catalogue of all log messages generated by Cassandra 0.6 when stress-testing a Cassandra installation over an extended period of time:
AntiEntropyService: Sending AEService tree for (,) to: []
CassandraDaemon: Binding thrift service to localhost/N.N.N.N:N
CassandraDaemon:…
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What is the best way of handling many-to-many relations in a RDBMS database like mySQL?
Have tried using a pivot table to keep track of the relationships, but it leads to either one of the following:
Normalization gets left behind
Columns that is empty or null
What approach have you taken in…
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I know implementing database is a huge topic, but I want to have a basic understanding of how database systems work (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database.
Since there are a few already proven…
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In previous articles discussing Oracle and VMware, the hardware and software components consisted of a Windows-based PC and the Oracle RDBMS. Steve Callan expands upon the "Oracle in a virtualized environment" concept by looking at other alternatives for the hardware and software.
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I'm working on a system to allow multiple users to collaborate on an online project. Everything is fairly straightforward, except for keeping the users in sync. Each user has their own local copy of the project database, which allows them to make changes and test things out, and then send the updates…
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I was always taught to strive for the highest Normal Form of database normalization, and we were taught Bernstein's Synthesis algorithm to achieve 3NF. This is all very well and it feels nice to normalize your database, knowing that fields can be modified while retaining consistency.
However, performance…
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