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If only insert data into the table, table fragmentation will never happen. But if insert, update and delete are executed on a table frequently, table fragmentation will come out. If a table takes more disk space than its size, it is called table fragmentation. We could know this by querying USER_SEGM ...
You know, one of the biggest advantage of Cassandra is the high writing speed. So I wrote a test on a single Cassandra node to see what's happening. What I found is reaaaaaaaally out of my expect. Based on test result, the write speed of Cassandra is much slower than Oracle. I don't know why.
Oracl ...
cassandra> connect 10.240.70.60/9160
Connected to: "Test Cluster" on 10.240.70.60/9160
cassandra> help
List of all CLI commands:
? Same as help.
help Display this ...
These days I am studying Cassandra and want to insert the SuperColumn into Cassandra with hector, which is high level Java API for Cassandra.I can't find an good example about the issue. Tons of folks are also asking the same question. So I write this example. May it help you.
There are 2 approache ...