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Naghme Vahabi
Naghme Vahabi

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READ_UNCOMMITTED in SQL Server

πŸ“‘ Understanding READ_UNCOMMITTED in SQL Server
READ_UNCOMMITTED is the lowest isolation level in SQL Server. When a query runs with this isolation level:

🟒 Benefits:

  • Fastest reading performance
  • No locks on data
  • Never waits for locks to be released

πŸ”΄ Risks:

  • Dirty Read: May read uncommitted data
  • Non-Repeatable Read: Reading the same record twice might give different results

❓When to use:

  • Non-critical reporting
  • Displaying approximate stats and metrics
  • Where eventual consistency is acceptable
  • Reading low-importance data where 100% accuracy isn't required

❓When NOT to use:

  • Financial transactions
  • Critical calculations
  • Where data consistency is crucial
  • Interdependent operations

using(var transaction = connection.BeginTransaction(IsolationLevel.ReadUncommitted))
{
// Read Data
}

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