By using AWS re:Post, you agree to the AWS re:Post Terms of Use
AWS re:Postre:Post

QLDB doing a full table scan when using an OR across two indexed fields

1

We have a table T with two indexed fields A and B. When we query the table using the following query, QLDB does a full table scan (by evidence of the IO stats and latency):

select * from T where A = 'x' or B = 'y'

Why? And is that expected?

Topics
Blockchain
Tags
Amazon Quantum Ledger Database
Language
English
Andrew
asked 8 months ago204 views
1 Answer
0

Well, a team member just pointed out that it is not supported according to this https://qldbguide.com/guide/data-design/#transaction-timeout

 --Multiple indexed fields (VIN, LicensePlateNumber) lookup using the OR operator
 --Disjunctions not currently supported 
 SELECT * FROM VehicleRegistration
 WHERE VIN = '1N4AL11D75C109151' OR LicensePlateNumber = 'LEWISR261LL'

This seems like a bizarre omission.

Andrew
answered 8 months ago

You are not logged in. Log in to post an answer.

A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.

Guidelines for Answering Questions

Relevant content