Question 95363 in Amazon Web Sevices Question posted in
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Why AWS Scan LastEvaluatedKey return values even when the Key not exist – Amazon web services

Why does AWS Scan LastEvaluatedKey return values ​​even when the key does not exist?

My scan request is

  {
  "TableName": "tks-processtracker-dumper",
  "ExclusiveStartKey": {
      "Mykey": {
          "S": "AKeyThatDoesntExists"
      }
  },
  "Limit": 2000
  }

Even passing a key that does not exist in the table, scanning still returns values.

My question is, should it return values ​​even when the key doesn’t exist? and why?

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2

Answers


  1. 0

    ExclusiveStartKey is essentially a pointer to a location on the storage medium.

    It doesn’t care if the item is there, it hashes the value you submit and that points to a location in disk and the Scan will proceed from that position.

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  2. 0

    It’s an EXCLUSIVE start key…

    It doesn’t have to exist, as DDB starts reading at whatever item has the next higher value.

    In SQL it’d look something like

    select *
from table
where tableKey > :exclusiveStartKey
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