cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From sonia gehlot <>
Subject Cassandra basics
Date Fri, 23 Jul 2010 22:48:12 GMT
Hi Guys,

Recently I have started reading about Cassandra from the material available
on net. But I have very confused with the basic understanding of Cassandra.
I understand columnFamilies, supper columnFamilies but I have no clear
understanding of

<Keyspace Name="Twitter">
  <ColumnFamily CompareWith="UTF8Type" Name="Statuses" />
  <ColumnFamily CompareWith="UTF8Type" Name="StatusAudits" />

  <ColumnFamily CompareWith="UTF8Type" Name="StatusRelationships"
CompareSubcolumnsWith="TimeUUIDType" ColumnType="Super" />
  <ColumnFamily CompareWith="UTF8Type" Name="Users" />

  <ColumnFamily CompareWith="UTF8Type" Name="UserRelationships"
CompareSubcolumnsWith="TimeUUIDType" ColumnType="Super" />

<ColumnFamily Name = "LocationUserIndexSCF"
         CompareWith = "UTF8Types"
         CompareSubcolumnsWith= "UTF8Type"
         ColumnType = "Super"/>

1. I don't understand what is this *"CompareWith", "CompareSuperColumnWith",
"CompareSubcolumnsWith"* etc is?

2. What is *"UTF8Type", "TimeUUIDType", "LongType", "ASCIIType" *etc.. is
these are datatypes? as we have datatype in SQL, if so then is this is
datatype of value stored in this column family?

May be I am getting confused because I am mixing my Relational databases
fundamentals with distributed.
Please If someone can explain me significance of these things then it would
be very helpful.

Thanks in advance.

Please reply.


View raw message