Main Registry Entries

Note  Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
 

Most of the registry entries for Indexing Service are found under the key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ ContentIndex.

The DefaultColumnFile entry is found under the key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndexCommon.

The main registry entries apply globally to all catalogs unless an entry with the same name exists under the Catalog subkey for a specific catalog. When an entry exists for a specific catalog, it takes precedence over the global, main registry entry. Some main registry entries cannot be overridden, as individually noted, but always apply globally.

The following table is an alphabetical list of the entries in this main registry group.

Entry nameDescription
CiCatalogFlags Controls file-modification notifications for scanning.
DaemonResponseTimeout Time-out for CiDaemon.EXE, the indexing process, if indexing a corrupt file.
DefaultColumnFile Full physical path and name of the file to read for column definitions in .asp files and in .idq files. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
DelayedFilterRetries Number of times Indexing Service tries to index documents that could not be indexed on the first try.
DelayUsnReadOnLowResource Controls reading the update sequence number (USN) journal during heavy use of resources.
DLLsToRegister List of dynamic-link libraries (DLLs) that have DllRegisterServer called when Indexing Service starts. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
EventLogFlags Controls types of events logged to Indexing Service event-message log.
FilterBufferSize Sets the size in memory for a communication buffer of an Indexing Service filter process.
FilterDelayInterval Determines time delay for controlling indexing resource use.
FilterDirectories Controls the indexing of system properties for directories.
FilterFilesWithUnknownExtensions Controls the indexing of files with unregistered extensions.
FilterIdleTimeout Time after which unused filter DLLs loaded by the CiDaemon.exe process are released.
FilterRemainingThreshold Delays when only a few files await filtering in order to control index resource use.
FilterRetries Maximum retries allowed to index a file.
FilterRetryInterval Time interval between indexing retries.
ForcedNetPathScanInterval Time interval between forced scans on directories on paths with no notifications.
ForcePathAlias Controls the conditions under which path aliasing is applied to query results.
GenerateCharacterization Controls the creation of an abstract of a file.
IMAPSvcInstance Instance number of the Internet Mail Access Protocol (IMAP) virtual server with virtual roots to index (Internet Information Services (IIS) only)
IsapiDateTimeFormatting Specifies what form of date and time formatting is applied to ISAPI queries. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiDateTimeLocal Specifies the time zone to use when formatting the date and time for ISAPI queries. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiDefaultCatalogDirectory Default Indexing Service catalog name. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiMaxEntriesInQueryCache Maximum number of cached queries. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiMaxRecordsInResultSet Maximum number of rows that can be returned from a query made using ISAPI. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiQueryCachePurgeInterval Time interval during which a query item persists in the cache. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiRequestQueueSize Maximum number of query requests to queue when servicing query requests. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsapiRequestThresholdFactor Multiplier for determining the maximum number of threads per server that simultaneously process query requests. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
IsAutoAlias Controls whether file shares automatically have aliases.
IsEnumAllowed Determines whether directory-enumeration can be used to execute a query.
IsIndexingIMAPSvc Configuration flag to index IMAP servers for IIS.
IsIndexingNNTPSvc Configuration flag to index Network News Transfer Protocol (NNTP) servers for IIS.
IsIndexingW3SVC Configuration flag to index web servers.
IsReadOnly Specifies whether the catalog is query-only and is not updated.
LeaveCorruptCatalog Specifies whether to clean up a corrupt catalog.
LowResourceCheckInterval Time interval after which to check resource usage when creating word lists.
LowResourceSleep Time interval that Indexing Service waits after low-resource conditions occur before retrying the affected processing.
MajorVersion Indicates major version number of Indexing Service. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MasterMergeCheckpointInterval Interval for checkpoints used when master merge is restarted.
MasterMergeTime Time of day to begin master merge.
MaxActiveQueryThreads Maximum number of query threads for ISAPI queries.
MaxActiveRequestThreads Maximum number of request threads. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxAutoAliasRefresh Frequency at which aliases for file shares are refreshed.
MaxCachedPipes Maximum number of cached named pipes. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxCatalogs Maximum number of catalogs that can be open at one time. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxCharacterization Maximum number of characters in an abstract.
MaxDaemonVmUse Maximum amount of pagefile space allocated to a swapped-out filter daemon.
MaxFilesizeFiltered Maximum size of file to filter. If size is exceeded, only the properties of the document are filtered—not the content.
MaxFilesizeMultiplier Multiplier for the maximum amount of index data allowable from a file before Indexing Service treats the file as invalid.
MaxFreshCount Maximum number of files for which index data is not included in master index.
MaxFreshDeletes Maximum number of files deleted from master index before master index is updated.
MaxIdealIndexes Maximum number of indexes in a well-tuned system.
MaxIndexes Maximum number of indexes in catalog.
MaxMergeInterval Wait interval for Indexing Service between merges.
MaxPendingDocuments Maximum number of documents not yet indexed before marking the index out of date for property queries.
MaxQueryExecutionTime Maximum execution time for query before an error is reported.
MaxQueryTimeslice Maximum query execution time for one time slice before another thread may be activated.
MaxQueueChunks Maximum number of buffers used for unfiltered documents.
MaxRestrictionNodes Maximum number of query restriction nodes.
MaxRunningWebhits Maximum number of instances of the WEBHITS.DLL that can run concurrently for use by ISAPI with a web server. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxShadowFreeForceMerge Maximum percentage of free disk space used by shadow indexes before a master merge is triggered.
MaxShadowIndexSize Maximum percentage of disk space used by shadow indexes before a master merge is triggered.
MaxSimultaneousRequests Maximum number of simultaneous query-request connections supported. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxTextFilterBytes Maximum amount of information the text filter can process from a single file with a well-known extension.
MaxUsnLogSize Maximum size of the USN journal.
MaxWebhitsCpuTime Time-out value for WEBHITS.DLL. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MaxWordlistIo Threshold of input/output (I/O) activity above which indexing is delayed.
MaxWordListIoDiskPerf System I/O threshold above which indexing is delayed when disk-performance counters are enabled.
MaxWordLists Maximum number of word lists before Indexing Service merges them to the master index.
MaxWordlistSize Maximum amount of memory for one word list.
MinClientIdleTime Amount of time a query client connection can be idle before the connection is dropped. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MinDiskFreeForceMerge Minimum percentage of free disk space available before a master merge is triggered.
MinDiskSpaceToLeave Minimum amount of free disk space to leave on a disk.
MinIdleQueryThreads Minimum number of idle threads available for queries.
MinIdleRequestThreads Minimum number of idle threads available for indexing. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MinimizeWorkingSet Flag to minimize requested working set for Indexing Service. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
MinMergeIdleTime Minimum percentage of average system idle time to allow annealing merges.
MinorVersion Minor version of Indexing Service.
MinSizeMergeWordlists Minimum combined size of word lists to force shadow merge.
MinWordlistBattery Minimum percentage of battery life required to keep indexing active.
MinWordlistMemory Minimum free memory available for new word lists.
NNTPSvcInstance Instance identifier (ID) for the NNTP server.
PropertyStoreBackupSize Size of memory allocation for primary property-cache backup on disk.
PropertyStoreMappedCache Maximum number of pages in memory for the primary property cache.
RequestTimeout For query clients, time to wait before named pipe instance request fails. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
ScanBackoff Controls the use of system resources by Indexing Service during scans.
SecPropertyStoreBackupSize Size of memory allocation for secondary property cache backup.
SecPropertyStoreMappedCache Maximum number of pages in memory for the secondary property cache.
StartupDelay Delay to let system start before initiating Indexing Service. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
StompLastAccessDelay Controls updating of the last access time property of a file being indexed.
ThreadClassFilter Priority class of the indexing process (CiDaemon.exe).
ThreadPriorityFilter Priority level of the filtering thread within the indexing process.
ThreadPriorityMerge Priority level of the merge thread within the indexing process.
UsnLogAllocationDelta Allocation to remove from front of the USN journal to make room to write more entries.
UsnReadMinSize Specifies the minimum size that the USN journal must attain before processing of change notifications proceeds.
UsnReadTimeout Specifies the maximum interval of time to wait before processing change notifications in the USN journal.
W3SvcInstance Instance ID of the World Wide Web (WWW) server being indexed.
WebhitsDisplayScript Controls whether to include scripting code in hit-highlighting results. Cannot be overridden by an identically named entry under the Catalog subkey for a specific catalog.
WordlistUserIdle User idle time required before filtering runs.

 

 

 

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