If you are thinking about column_index_size_in_kb in Cassandra.yaml then yes.
Aaron On 11/02/2011, at 9:39 AM, Aditya Narayan <ady...@gmail.com> wrote: > Thank you Aaron!! > > But, If you are reading partial rows(that otherwise contain several > thousands of **valueless** columns) then do the column indexes help in > making the reads faster & more efficient than if they were not > valueless? > Perhaps, because they would only need to look up whether the asked > column names exist in indexes for that row/key & they dont need to > deserialize the blocks in SST tables searching for column values. Am I > thinking right way?? > > > -Aditya > > > > On Fri, Feb 11, 2011 at 1:54 AM, Aaron Morton <aa...@thelastpickle.com> wrote: >> If you want to get the byte size of a particular row you will need to read >> it all back. >> >> If you connect with JConsole at look at you column families, there are >> attributes for the max, min and mean row sizes. >> >> In general the entire row only exists in memory when it is contained in the >> first Memtable it's written to. It may then be partially or fully read from >> disk during subsequent reads or compactions. >> >> On disk format described here may help >> http://wiki.apache.org/cassandra/ArchitectureSSTable >> >> Hope that helps >> Aaron >> On 10/02/2011, at 11:56 PM, Aditya Narayan <ady...@gmail.com> wrote: >> >>> How can I get or calculate the size of rows/ columns ? what are the >>> any overheads on memory for each column/row ? >>
