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If you don’t find Expensive Threshold key under specified registry path, then simply create a new DWORD key with same name.ĭefault threshold for inefficient call is 1,000 which means any call which will visit 1,000 or more entries and return less 10% of visited entries will be consider as inefficient and will be logged in event viewer under 1644 Event Id. You can modify the default limit by changing the value of 'Expensive Threshold' key under 'HKLM\SYSTEM\CurrentControlSet\Services\NTDS\Parameters' registry path. Threshold settings identifies which LDAP call should be consider as expensive or inefficient.ĭefault threshold for expensive LDAP call is 10,000 which means any LDAP call which will visit 10,000 or more entries will be consider expensive and will be logged in event viewer under 1644 Event Id. So far we have defined Expensive, Inefficient and Unnecessary LDAP calls. Tracing these calls are tricky…you have to log all LDAP calls and identify the unnecessary ones by manually reviewing them. All of these LDAP binding calls for each returned entry will be consider unnecessary in this scenario. For example, you search a user ‘John’ from the tool and you expect that tool will generate one LDAP call, something like (displayName=”John”), but when you look into the logs you notice that tool have also generated separate LDAP bindings calls for each returned entries those were definitely not required for this particular operation. These are the normal LDAP calls but we consider those not required for one particular operation. There is no such term as Unnecessary LDAP call defined by Microsoft. Default visited entries threshold limit for inefficient query is 1,000 which means if a query visit less than 1000 entries then it will not be consider inefficient query even though if it return no entry. For example, if a query visit 10,000 entries in active directory but only return 100 entries then it will be consider inefficient query as return entries are less than 10% of total visited entries. Inefficient LDAP calls are the searches those return less than 10% of visited entries.
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For example a query (displayName=*John*) on root domain container will visit all objects in the domain those have any value available in displayName attribute and it will be consider an expensive call if there are 10,000 or plus such objects those have displayName attribute populated. Once you find such call in logs, you can figure out possible solutions to optimize it. Default threshold for expensive search is 10,000 which means if an LDAP call visit 10,000 or more entries then it will be consider as an expensive call. First, let define what these terms are,Įxpensive LDAP calls are the searches those visit large number of entries.
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In this article we will identify Expensive, Inefficient and Unnecessary LDAP calls generated by a specific software.