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Understanding Query Business Rules vs. Access Control Lists in ServiceNow

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This article provides a detailed comparison between Query Business Rules (Query BR) and Access Control Lists (ACL) in ServiceNow, highlighting their differences in access restriction, user experience, performance, debugging, and impact on scripts. It aims to help developers make informed decisions about which method to use based on specific scenarios.
  • main points
  • unique insights
  • practical applications
  • key topics
  • key insights
  • learning outcomes

  • • main points

    • 1
      Comprehensive comparison of Query BR and ACL across multiple dimensions
    • 2
      Practical insights into performance implications and user experience
    • 3
      Community engagement through comments that add depth to the discussion

  • • unique insights

    • 1
      Query BR can improve performance in specific scenarios but may complicate debugging and impact scripts negatively.
    • 2
      ACLs provide better visibility of security constraints but can lead to user frustration with empty records.

  • • practical applications

    • The article serves as a practical guide for developers in choosing the appropriate method for access control in ServiceNow, supported by real-world examples and community feedback.

  • • key topics

    • 1
      Access restriction methods in ServiceNow
    • 2
      Performance implications of Query BR vs. ACL
    • 3
      User experience considerations in access control

  • • key insights

    • 1
      In-depth analysis of the trade-offs between Query BR and ACL.
    • 2
      Community-driven insights that enhance the article's credibility.
    • 3
      Practical recommendations for developers based on real-world scenarios.

  • • learning outcomes

    • 1
      Understand the differences between Query Business Rules and ACL in ServiceNow.
    • 2
      Identify when to use each method based on specific scenarios.
    • 3
      Gain insights into performance implications and user experience considerations.
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“ Introduction to Query Business Rules and ACLs

Query Business Rules restrict access at the row level, meaning they can limit visibility to entire records, such as an Incident. In contrast, ACLs provide global, table, or field-level access restrictions, allowing for more granular control. If conditional access to specific fields is necessary, ACLs are the preferred choice.

“ User Experience: How Each Method Affects Users

Performance is a critical consideration when choosing between QBRs and ACLs. QBRs are evaluated once per table query, potentially offering better performance. However, ACLs are evaluated for each record individually, which can lead to performance degradation, especially in high-traffic scenarios.

“ Debugging Capabilities of QBR and ACL

QBRs can affect all scripts running on the associated table, complicating debugging and potentially leading to unexpected results. In contrast, ACLs do not impact scripts unless explicitly referenced, allowing for more predictable behavior in script execution.

“ Scoped Applications and User Impersonation

To optimize performance and security, developers should consider best practices when implementing QBRs and ACLs. This includes documenting access restrictions, avoiding complex queries, and leveraging caching strategies to minimize performance impacts.

 Original link: https://www.servicenow.com/community/developer-articles/query-business-rules-vs-acl-comparison/ta-p/2319460

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