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# 9 Queue

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#### Overview

The queue displays items that are waiting for a refresh. The queue is
just a **logical** representation of data. There is no IPC queue or any
other queue mechanism in Zabbix.

Items monitored by proxies are also included in the queue - they will be
counted as queued for the proxy history data update period.

Only items with scheduled refresh times are displayed in the queue. This
means that the following item types are excluded from the queue:

-   log, logrt and event log active Zabbix agent items
-   SNMP trap items
-   trapper items
-   web monitoring items
-   dependent items

Statistics shown by the queue is a good indicator of the performance of
Zabbix server.

The queue is retrieved directly from Zabbix server using JSON protocol.
The information is available only if Zabbix server is running.

:::noteimportant
Items are not counted in the queue if the item interface becomes unavailable due to connection problems or agent not working properly.
:::

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#### Reading the queue

To read the queue, go to *Administration → Queue*.

![](../../../../assets/en/manual/config/items/queue.png){width="600"}

The picture here is generally "ok" so we may assume that the server is
doing fine.

The queue shows some items waiting up to 30 seconds. It would be great
to know what items these are.

To do just that, select *Queue details* in the title dropdown. Now you
can see a list of those delayed items.

![](../../../../assets/en/manual/config/items/queue_details.png){width="600"}

With these details provided it may be possible to find out why these
items might be delayed.

With one or two delayed items there perhaps is no cause for alarm. They
might get updated in a second. However, if you see a bunch of items
getting delayed for too long, there might be a more serious problem.

**See also:** Aligning time zones when using [scheduling intervals](/manual/config/items/item/custom_intervals#aligning-time-zones-for-proxies-and-agent-2).

![](../../../../assets/en/manual/config/items/queue_b.png){width="600"}

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#### Queue item

A special internal item **zabbix\[queue,<from>,<to>\]** can
be used to monitor the health of the queue in Zabbix. It will return the
number of items delayed by the set amount of time. For more information
see [Internal items](/manual/config/items/itemtypes/internal).

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