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Ed Costello
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Various edits for style, some typos
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source/reference/server-status.txt

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@@ -8,7 +8,7 @@ Server Status Reference
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``docs/source/reference/server-status-index.txt`` document also
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reflects those changes.
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The :dbcommand:`serverStatus` returns a collection of information that
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The :dbcommand:`serverStatus` command returns a collection of information that
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reflects the database's status. These data are useful for diagnosing
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and assessing the performance of your MongoDB instance. This reference
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catalogs each datum included in the output of this command and
@@ -17,7 +17,7 @@ your database.
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.. seealso:: Much of the output of :dbcommand:`serverStatus` is also
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displayed dynamically by :program:`mongostat`. See the
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:doc:`/reference/mongostat` for more information.
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:doc:`/reference/mongostat` command for more information.
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For examples of the :dbcommand:`serverStatus` output, see
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:doc:`/reference/server-status-index`.
@@ -32,7 +32,7 @@ Instance Information
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.. status:: host
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The :status:`host` field contains the system's hostname. In Unix/Linux
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system, this should be the same as the output of the ``hostname``
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systems, this should be the same as the output of the ``hostname``
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command.
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.. status:: version
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.. status:: locks...timeLockedMicros.W
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The ``W`` field reports the amount of time in microseconds that any
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database databases has held the global write lock.
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database has held the global write lock.
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.. status:: locks...timeLockedMicros.r
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The ``r`` field reports the amount of time in microseconds that any
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database databases has held the local read lock.
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database has held the local read lock.
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.. status:: locks...timeLockedMicros.w
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The ``w`` field reports the amount of time in microseconds that any
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database databases has held the local write lock.
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database has held the local write lock.
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.. status:: locks...timeAcquiringMicros
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The :status:`locks...timeAcquiringMicros` document reports the amount of
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time in microseconds that operations have spent waiting to acquire
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a lock in all database in this :program:`mongod` instance.
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a lock in all databases in this :program:`mongod` instance.
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.. status:: locks...timeAcquiringMicros.R
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The ``R`` field reports the amount of time in microseconds that any
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database databases has spent waiting for the global read lock.
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database has spent waiting for the global read lock.
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.. status:: locks...timeAcquiringMicros.W
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The ``W`` field reports the amount of time in microseconds that any
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database databases has spent waiting for the global write lock.
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database has spent waiting for the global write lock.
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.. status:: locks.admin
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The :status:`locks.admin` document contains two sub-documents that
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reports data regarding lock use in the :term:`admin database`.
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report data regarding lock use in the :term:`admin database`.
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.. status:: locks.admin.timeLockedMicros
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.. status:: locks.admin.timeAcquiringMicros.r
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The ``r`` field reports the amount of time in microseconds that
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operations have spent waiting a read lock on the
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operations have spent waiting to acquire a read lock on the
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:term:`admin database`.
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.. status:: locks.admin.timeAcquiringMicros.w
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The ``w`` field reports the amount of time in microseconds that
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operations have spent waiting a write lock on the
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operations have spent waiting to acquire a write lock on the
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:term:`admin database`.
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.. status:: locks.local
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The :status:`locks.local` document contains two sub-documents that
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reports data regarding lock use in the ``local`` database. The
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report data regarding lock use in the ``local`` database. The
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local database contains a number of instance specific data,
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including the :term:`oplog` for replication.
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@@ -212,13 +212,13 @@ locks
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.. status:: locks.local.timeAcquiringMicros.r
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The ``r`` field reports the amount of time in microseconds that
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operations have spent waiting a read lock on the ``local``
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operations have spent waiting to acquire a read lock on the ``local``
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database.
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.. status:: locks.local.timeAcquiringMicros.w
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The ``w`` field reports the amount of time in microseconds that
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operations have spent waiting a write lock on the ``local``
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operations have spent waiting to acquire a write lock on the ``local``
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database.
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.. status:: locks.<database>
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.. status:: locks.<database>.timeAcquiringMicros.r
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The ``r`` field reports the amount of time in microseconds that
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operations have spent waiting a read lock on the ``<database>``
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operations have spent waiting to acquire a read lock on the ``<database>``
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database.
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.. status:: locks.<database>.timeAcquiringMicros.w
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The ``w`` field reports the amount of time in microseconds that
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operations have spent waiting a write lock on the ``<database>``
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operations have spent waiting to acquire a write lock on the ``<database>``
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database.
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.. _globallock:
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should cause no concern. Also, consider this value in light of the
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size of queue waiting for the read lock
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(e.g. :status:`globalLock.currentQueue.readers`) and write-lock
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(e.g. :status:`globalLock.currentQueue.readers`) individually.
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(e.g. :status:`globalLock.currentQueue.writers`) individually.
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.. status:: globalLock.currentQueue.readers
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The value of :status:`globalLock.currentQueue.readers` is the number of
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operations that are currently queued and waiting for the
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read-lock. A consistently small write-queue, particularly of
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read-lock. A consistently small read-queue, particularly of
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shorter operations should cause no concern.
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.. status:: globalLock.currentQueue.writers
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.. status:: extra_info.heap_usage_bytes
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The :status:`extra_info.heap_usage_bytes` field is only available on
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Unix/Linux systems, and relates the total size in bytes of heap space
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Unix/Linux systems, and reports the total size in bytes of heap space
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used by the database process.
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.. status:: extra_info.page_faults
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The :status:`extra_info.page_faults` field is only available on Unix/Linux
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systems, and relates the total number of page faults that require
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systems, and reports the total number of page faults that require
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disk operations. Page faults refer to operations that require the
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database server to access data which isn't available in active
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memory. The :status:`page_fault <extra_info.page_faults>` counter may increase dramatically during
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moments of poor performance and may correlate with limited
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memory environments and larger data sets. Limited and sporadic page
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faults do not in and of themselves indicate an issue.
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faults do not necessarily indicate an issue.
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.. _server-status-indexcounters:
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.. status:: indexCounters.btree.resets
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The :status:`index Counter.btree.resets` value reflects the number
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The :status:`indexCounters.btree.resets` value reflects the number
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of times that the index counters have been reset since the database
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last restarted. Typically this value is ``0``, but use this value
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to provide context for the data specified by other
@@ -587,7 +587,7 @@ backgroundFlushing
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:program:`mongod` periodically flushes writes to disk. In the default
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configuration, this happens every 60 seconds. The
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:status:`backgroundFlushing` data structure contains data that regarding
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:status:`backgroundFlushing` data structure contains data regarding
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these operations. Consider these values if you have concerns about
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write performance and :ref:`journaling <journaling-status>`.
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because of how MongoDB serializes operations during replication.
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See :doc:`/core/replication` for more information on replication.
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These numbers will grow over time and in response to database
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These numbers will grow over time in response to database
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use. Analyze these values over time to track database utilization.
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.. status:: opcountersRepl.insert
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times that the rollover counters have rolled over since the last
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time the server process started. The counters will rollover to zero
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after 2\ :superscript:`30` assertions. Use this value to provide
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context to the other values in the :status:`asserts` data structure
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context to the other values in the :status:`asserts` data structure.
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.. _server-status-writebacksqueued:
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.. _server-status-write-backs-queued:
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interval is configurable using the ``--journalCommitInterval``
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option.
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See the ":wiki:`Journaling`" wiki page for more information about
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journaling operations.
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.. seealso:: ":wiki:`Journaling`" for more information about journaling operations.
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.. STUB :doc:`/core/journaling`
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.. status:: dur.commits
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The :status:`dur.commits` provides the number of transactions
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written to :term:`journal` during the last :wiki:`journal group
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written to the :term:`journal` during the last :wiki:`journal group
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commit interval <Journaling#Journaling-GroupCommits>`.
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.. status:: dur.journaledMB
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.. status:: dur.earlyCommits
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The :status:`dur.earlyCommits` value reflects the number of time
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The :status:`dur.earlyCommits` value reflects the number of times
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MongoDB requested a commit before the scheduled :wiki:`journal group
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commit interval <Journaling#Journaling-GroupCommits>`. Use this
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value to ensure that your :wiki:`journal group commit interval

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