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<html xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:mshelp="http://msdn.microsoft.com/mshelp" xmlns:ddue="http://ddue.schemas.microsoft.com/authoring/2003/5" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:msxsl="urn:schemas-microsoft-com:xslt"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8" /><META NAME="save" CONTENT="history" /><title>RetransmissionRequest Method </title><link rel="stylesheet" type="text/css" href="../styles/presentation.css" /><link rel="stylesheet" type="text/css" href="ms-help://Hx/HxRuntime/HxLink.css" /><script type="text/javascript" src="../scripts/EventUtilities.js"> </script><script type="text/javascript" src="../scripts/SplitScreen.js"> </script><script type="text/javascript" src="../scripts/Dropdown.js"> </script><script type="text/javascript" src="../scripts/script_manifold.js"> </script><script type="text/javascript" src="../scripts/script_feedBack.js"> </script><script type="text/javascript" src="../scripts/CheckboxMenu.js"> </script><script type="text/javascript" src="../scripts/CommonUtilities.js"> </script><meta name="container" content="BerkeleyDB" /><meta name="file" content="M_BerkeleyDB_ReplicationConfig_RetransmissionRequest" /><meta name="guid" content="M_BerkeleyDB_ReplicationConfig_RetransmissionRequest" /><xml><MSHelp:Attr Name="AssetID" Value="M:BerkeleyDB.ReplicationConfig.RetransmissionRequest(System.UInt32,System.UInt32)" /><MSHelp:TOCTitle Title="RetransmissionRequest Method " /><MSHelp:RLTitle Title="ReplicationConfig.RetransmissionRequest Method (BerkeleyDB)" /><MSHelp:Keyword Index="A" Term="M:BerkeleyDB.ReplicationConfig.RetransmissionRequest(System.UInt32,System.UInt32)" /><MSHelp:Keyword Index="A" Term="frlrfBerkeleyDBReplicationConfigClassRetransmissionRequestTopic" /><MSHelp:Keyword Index="K" Term="RetransmissionRequest method" /><MSHelp:Keyword Index="K" Term="ReplicationConfig.RetransmissionRequest method" /><MSHelp:Keyword Index="F" Term="RetransmissionRequest" /><MSHelp:Keyword Index="F" Term="ReplicationConfig.RetransmissionRequest" /><MSHelp:Keyword Index="F" Term="BerkeleyDB.ReplicationConfig.RetransmissionRequest" /><MSHelp:Attr Name="APIType" Value="Managed" /><MSHelp:Attr Name="APILocation" Value="libdb_dotnet53.dll" /><MSHelp:Attr Name="APIName" Value="BerkeleyDB.ReplicationConfig.RetransmissionRequest" /><MSHelp:Attr Name="DevLang" Value="CSharp" /><MSHelp:Attr Name="DevLang" Value="VB" /><MSHelp:Attr Name="DevLang" Value="C++" /><MSHelp:Attr Name="Locale" Value="en-us" /><MSHelp:Attr Name="TopicType" Value="kbSyntax" /><MSHelp:Attr Name="TopicType" Value="apiref" /><MSHelp:Attr Name="Abstract" Value="Set a threshold for the minimum and maximum time that a client waits before requesting retransmission of a missing message." /><MSHelp:Attr Name="AssemblyVersion" Value="5.3.28.0" /></xml></head><body><input type="hidden" id="userDataCache" class="userDataStyle" /><input type="hidden" id="hiddenScrollOffset" /><img id="collapseImage" style="display:none; 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Set a threshold for the minimum and maximum time that a client waits
before requesting retransmission of a missing message.
</div><p />
<b>Namespace:</b>
<a href="N_BerkeleyDB.htm">BerkeleyDB</a><br />
<b>Assembly:</b>
<span sdata="assembly">libdb_dotnet53</span> (in libdb_dotnet53.dll) Version: 5.3.28.0<h1 class="heading"><span onclick="ExpandCollapse(syntaxToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(syntaxToggle, event)" tabindex="0"><img id="syntaxToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Syntax</span></h1><div id="syntaxSection" class="section" name="collapseableSection" style=""><div id="syntaxCodeBlocks" class="code"><span codeLanguage="CSharp"><table><tr><th>C#</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">void</span> <span class="identifier">RetransmissionRequest</span>(
<a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">uint</a> <span class="parameter">min</span>,
<a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">uint</a> <span class="parameter">max</span>
)</pre></td></tr></table></span><span codeLanguage="VisualBasicDeclaration"><table><tr><th>Visual Basic (Declaration)</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">Public</span> <span class="keyword">Sub</span> <span class="identifier">RetransmissionRequest</span> ( _
<span class="parameter">min</span> <span class="keyword">As</span> <a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">UInteger</a>, _
<span class="parameter">max</span> <span class="keyword">As</span> <a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">UInteger</a> _
)</pre></td></tr></table></span><span codeLanguage="ManagedCPlusPlus"><table><tr><th>Visual C++</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span>:
<span class="keyword">void</span> <span class="identifier">RetransmissionRequest</span>(
<a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">unsigned int</a> <span class="parameter">min</span>,
<a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">unsigned int</a> <span class="parameter">max</span>
)</pre></td></tr></table></span></div><div id="parameters"><h4 class="subHeading">Parameters</h4><dl paramName="min"><dt><span class="parameter">min</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">System<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span></span>UInt32</a><br />
The minimum number of microseconds a client waits before requesting
retransmission.
</dd></dl><dl paramName="max"><dt><span class="parameter">max</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/ctys3981" target="_blank">System<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span></span>UInt32</a><br />
The maximum number of microseconds a client waits before requesting
retransmission.
</dd></dl></div></div><h1 class="heading"><span onclick="ExpandCollapse(remarksToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(remarksToggle, event)" tabindex="0"><img id="remarksToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Remarks</span></h1><div id="remarksSection" class="section" name="collapseableSection" style="">
<p>
If the client detects a gap in the sequence of incoming log records
or database pages, Berkeley DB will wait for at least
<span class="parameter">min</span> microseconds before requesting retransmission
of the missing record. Berkeley DB will double that amount before
requesting the same missing record again, and so on, up to a
maximum threshold of <span class="parameter">max</span> microseconds.
</p>
<p>
These values are thresholds only. Replication Manager applications
use these values to determine when to automatically request
retransmission of missing messages. For Base API applications,
Berkeley DB has no thread available in the library as a timer, the
threshold is only checked when a thread enters the Berkeley DB
library to process an incoming replication message. Any amount of
time may have passed since the last message arrived and Berkeley DB
only checks whether the amount of time since a request was made is
beyond the threshold value or not.
</p>
<p>
By default the minimum is 40000 and the maximum is 1280000 (1.28
seconds). These defaults are fairly arbitrary and the application
likely needs to adjust these. The values should be based on expected
load and performance characteristics of the master and client host
platforms and transport infrastructure as well as round-trip message
time.
</p>
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