An Introduction: Level 1 of the Stairway to Row-Level Security

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An Introduction: Level 1 of the Stairway to Row-Level Security

Steve Jones - SSC Editor

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December 28, 2017 at 12:05 am

#341419

Comments posted to this topic are about the item An Introduction: Level 1 of the Stairway to Row-Level Security

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HappyGeek SSCoach Points: 18729 More actions · Answer 1

Nice simple easy to follow article, thank you Steve. Just one observation; where is the link to your sample code?

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Fat Uncle Dan Valued Member Points: 56 More actions · Answer 2

From Article:
These are the 3 rows with SalesPersonID = 1. The second result set shows 2 rows, each of these with SalesPersonID = 2. This second query was executed as sjones.

From the data, it seems that the 3 rows is where SalesPersonID = 2 and the 2 rows where SalesPersonID = 1. Or am I missing something obvious here?

cstater Old Hand Points: 377 More actions · Answer 3

Fat Uncle Dan - Thursday, December 28, 2017 9:47 AM
From Article:
These are the 3 rows with SalesPersonID = 1. The second result set shows 2 rows, each of these with SalesPersonID = 2. This second query was executed as sjones.
From the data, it seems that the 3 rows is where SalesPersonID = 2 and the 2 rows where SalesPersonID = 1. Or am I missing something obvious here?

I noticed the same thing. I don't think you are missing anything, just a typo.

rstone SSCertifiable Points: 6209 More actions · Answer 4

We have one application with a poorly performing security implementation. Does anybody have any guidance on the performance impact of RLS on a query? Is it easy to avoid or mitigate performance issues?

RandyHelpdesk: Perhaps Im not the only one that does not know what you are doing. 😉

Steve Jones - SSC Editor SSC Guru Points: 736063 More actions · Answer 5

cstater - Thursday, December 28, 2017 9:51 AM
Fat Uncle Dan - Thursday, December 28, 2017 9:47 AM
From Article:
These are the 3 rows with SalesPersonID = 1. The second result set shows 2 rows, each of these with SalesPersonID = 2. This second query was executed as sjones.
From the data, it seems that the 3 rows is where SalesPersonID = 2 and the 2 rows where SalesPersonID = 1. Or am I missing something obvious here?
I noticed the same thing. I don't think you are missing anything, just a typo.

typo. Corrected.

Steve Jones - SSC Editor SSC Guru Points: 736063 More actions · Answer 6

rstone - Thursday, December 28, 2017 10:36 AM
We have one application with a poorly performing security implementation. Does anybody have any guidance on the performance impact of RLS on a query? Is it easy to avoid or mitigate performance issues?

This is a function, really a CROSS APPLY type function added to your queries. If there are indexes, I wouldn't expect there to be much impact from normal query performance. However, YMMV. I'd certainly like to see more people test this at higher scales with specific queries.

If we can get this site upgraded to 2017, I'd like to implement some RLS just to see.

Steve Jones - SSC Editor SSC Guru Points: 736063 More actions · Answer 7

Steve Jones - SSC Editor

SSC Guru

Points: 736063

December 28, 2017 at 10:44 am

#1973727

Code now attached at the bottom of the article.