MAX CORE in Rollup in Abinitio | Rollup algorithm for unsorted data

 

                     MAX CORE in Rollup in Abinitio | Rollup algorithm for unsorted data 




hash Tabale willl have KEY VALUE record along with pass through filed and values

Roll Up reads the records and keep on adding/updating the Hash Table untill it reaches to the MAX_CORE limit

Then it read record and if the key is there in the HASH table it updates that records else it has to spill to disk

It does so untill all inputs have been read.

Spillage Depends on -  The size of the group ( distinct key value group)+ the pass through fields + data distribution of the incoming data

How much spillage : after the max core everything will  be spilled to disk 

2nd Iteration of Spillage - when the distinct keys groups are huge , then it may not hold the data in the hash table again

                 so it may spill 2nd time as well.

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@datapundit

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