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the cassandra data model eben hewitt cassandra summit - san francisco 8.10.2010
 
[object Object],[object Object],[object Object]
things we know about cassandra ,[object Object],[object Object]
these things are wrong.
?...
consistency ,[object Object],1
consistency ,[object Object],1
PACELC ,[object Object],[object Object],[object Object],[object Object],[object Object]
cassandra is consistent  when read replica count +  write replica count > replication factor cassandra is consistent  if you read & write at  CL.QUORUM   (once  Q  nodes are up) good place to start ,[object Object],r = # of nodes consulted during read op w = # of replicas consulted during write op n = replicas r + w + n = consistent
cassandra is   row-oriented ,[object Object],[object Object],2
column ,[object Object],[object Object],email : alison@foo.com : 12578123685
column family
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],column family
super column super columns group columns under a common name
super column family
about super column families ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],s super column super column family flexible schema key column  super column family
[object Object],[object Object],[object Object]
what about… ,[object Object],[object Object],[object Object],[object Object],?
rdbms :  domain-based model   what answers do I have? cassandra :  query-based model   what  questions  do I have?
Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SELECT WHERE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SELECT WHERE pt 2
ORDER BY ,[object Object],[object Object],[object Object],[object Object],[object Object],Columns   are sorted according to CompareWith  or  CompareSubcolumnsWith
JOIN ON ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
GROUP ,[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],materialized view
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],materialized view
[object Object],valueless column
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],valueless column
[object Object],composite key
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],composite key
[object Object],semantic key
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],semantic key
[object Object],client clock sync
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],client clock sync
EXAMPLE
 
 
is cassandra a  good fit? ,[object Object],[object Object],[object Object],[object Object]
custom comparators ,[object Object],[object Object],[object Object]
choose  keys  carefully ,[object Object],[object Object],[object Object],[object Object]
new use cases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
see also ,[object Object],[object Object]
[object Object],[object Object]

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Cassandra Data Model