Bird
0
0

A trigger is causing deadlocks because it updates the same table it fires on. How can this be fixed?

medium📝 Debug Q6 of 15
SQL - Triggers
A trigger is causing deadlocks because it updates the same table it fires on. How can this be fixed?
ADisable the trigger permanently
BModify the trigger to avoid updating the triggering table
CIncrease the database timeout settings
DAdd more indexes to the table
Step-by-Step Solution
Solution:

  1. Step 1: Identify cause of deadlocks

    Trigger updating its own table can cause locking conflicts.

  2. Step 2: Apply fix by changing trigger logic

    Avoid updating the same table inside the trigger to prevent deadlocks.

  3. Final Answer:

    Modify the trigger to avoid updating the triggering table -> Option B

  4. Quick Check:

    Avoid self-updates in triggers to prevent deadlocks [OK]
Quick Trick: Avoid triggers updating their own table to prevent deadlocks [OK]
Common Mistakes:
  • Thinking indexes fix deadlocks caused by triggers
  • Increasing timeout does not solve deadlocks
  • Disabling triggers without fixing logic

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More SQL Quizzes
Advanced Query Patterns - Why query patterns matter - Quiz 9hard Advanced Query Patterns - Date range overlap detection - Quiz 4medium Advanced Window Functions - Why advanced window functions matter - Quiz 14medium Advanced Window Functions - NTH_VALUE function - Quiz 14medium CASE Expressions - COALESCE and NULLIF as CASE shortcuts - Quiz 14medium Common Table Expressions (CTEs) - CTE as readable subquery replacement - Quiz 11easy Database Design and Normalization - Third Normal Form (3NF) - Quiz 7medium Database Design and Normalization - Third Normal Form (3NF) - Quiz 15hard Indexes and Query Performance - How an index works (B-tree mental model) - Quiz 5medium SQL Security Basics - How string concatenation creates vulnerabilities - Quiz 9hard