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    Set Index Priority Operation

    • In RavenDB, each index has its own dedicated thread for all indexing work.
      By default, RavenDB prioritizes processing requests over indexing,
      so indexing threads start with a lower priority than request-processing threads.

    • Use SetIndexesPriorityOperation to increase or lower the index thread priority.

    • Indexes scope:
      Index priority can be set for both static and auto indexes.

    • Nodes scope:
      The priority will be updated on all nodes in the database group.

    • Setting the priority can also be done from the indexes list view in the Studio.

    • In this page:

    Index priority

    Setting the priority will affect the indexing thread priority at the operating system level:

    Priority value Indexing thread priority
    at OS level
    Low Lowest
    • Having the Lowest priority at the OS level, indexes will run only when there's a capacity for them, when the system is not occupied with higher-priority tasks.
    • Requests to the database will complete faster.
      Use when querying the server is more important to you than indexing.
    Normal (default) Below normal
    • Requests to the database are still preferred over the indexing process.
    • The indexing thread priority at the OS level is Below normal
      while Requests processes have a Normal priority.
    High Normal
    • Requests and Indexing will have the same priority at the OS level.

    Set priority - single index 

    // Define the set priority operation
// Pass index name & priority
var setPriorityOp = new SetIndexesPriorityOperation("Orders/Totals", IndexPriority.High);

// Execute the operation by passing it to Maintenance.Send
// An exception will be thrown if index does not exist
store.Maintenance.Send(setPriorityOp);
    // Define the set priority operation
// Pass index name & priority
var setPriorityOp = new SetIndexesPriorityOperation("Orders/Totals", IndexPriority.High);
                
// Execute the operation by passing it to Maintenance.SendAsync
// An exception will be thrown if index does not exist
await store.Maintenance.SendAsync(setPriorityOp);

    Set priority - multiple indexes 

    // Define the index list and the new priority:
var parameters = new SetIndexesPriorityOperation.Parameters
{
    IndexNames = new[] {"Orders/Totals", "Orders/ByCompany"},
    Priority = IndexPriority.Low
};

// Define the set priority operation, pass the parameters
var setPriorityOp = new SetIndexesPriorityOperation(parameters);

// Execute the operation by passing it to Maintenance.Send
// An exception will be thrown if any of the specified indexes do not exist
store.Maintenance.Send(setPriorityOp);
    // Define the index list and the new priority:
var parameters = new SetIndexesPriorityOperation.Parameters 
{
    IndexNames = new[] {"Orders/Totals", "Orders/ByCompany"}, 
    Priority = IndexPriority.Low
};
                
// Define the set priority operation, pass the parameters
var setPriorityOp = new SetIndexesPriorityOperation(parameters);

// Execute the operation by passing it to Maintenance.SendAsync
// An exception will be thrown if any of the specified indexes do not exist
await store.Maintenance.SendAsync(setPriorityOp);

    Syntax 

    // Available overloads:
public SetIndexesPriorityOperation(string indexName, IndexPriority priority);
public SetIndexesPriorityOperation(Parameters parameters);
    Parameters
    indexName string Index name for which to change priority
    priority IndexingPriority Priority to set
    parameters SetIndexesPriorityOperation.Parameters List of indexes + Priority to set.
    An exception is thrown if any of the specified indexes do not exist.    		 

    public enum IndexPriority
{
    Low,
    Normal,
    High
}

    public class Parameters
{
    public string[] IndexNames { get; set; }
    public IndexPriority Priority { get; set; }
}

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