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A transaction cannot contain more than 25 unique items - In a DynamoDB. Refer : https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-dynamodb-transactions

What the QLDB limits on this? Also, does QLDB support across table transactions?

dashuser
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    Maybe this link can help: https://docs.aws.amazon.com/qldb/latest/developerguide/limits.html – DavidC Jan 10 '20 at 22:03
  • Thanks! It looks like it supports 4MB size on a transaction and doesn't explicity state item count limit. Just looking if QLDB supports cross table transactions as well :) ? – dashuser Jan 13 '20 at 19:01

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As per the limits page:

Number of documents in a transaction    40

QLDB transactions can operate across tables (but not across ledgers).

Marc
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