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# 3 ハウスキーピング

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#### Overview

The housekeeper is a periodical process, executed by Zabbix server. The
process removes outdated information and information deleted by user.

![](../../../../../assets/en/manual/web_interface/frontend_sections/administration/general_housekeeper1.png)

In this section housekeeping tasks can be enabled or disabled on a
per-task basis separately for: events and alerts/IT services/user
sessions/history/trends. Audit housekeeping settings are available in a
separate [menu
section](/manual/web_interface/frontend_sections/administration/general#audit_log).

If housekeeping is enabled, it is possible to set for how many days data
records will be kept before being removed by the housekeeper.

Deleting an item/trigger will also delete problems generated by that
item/trigger.

Also, an event will only be deleted by the housekeeper if it is not
associated with a problem in any way. This means that if an event is
either a problem or recovery event, it will not be deleted until the
related problem record is removed. The housekeeper will delete problems
first and events after, to avoid potential problems with stale events or
problem records.

For history and trends an additional option is available: *Override item
history period* and *Override item trend period*. This option allows to
globally set for how many days item history/trends will be kept (1 hour
to 25 years; or "0"), in this case overriding the values set for
individual items in *History storage period/Trend storage period* fields
in [item configuration](/manual/config/items/item). Note, that the
storage period will not be overridden for items that have configuration
option *Do not keep history* and/or *Do not keep trends* enabled.

It is possible to override the history/trend storage period even if
internal housekeeping is disabled. Thus, when using an external
housekeeper, the history storage period could be set using the history
*Data storage period* field.

::: noteimportant
If using TimescaleDB, in order to take full
advantage of TimescaleDB automatic partitioning of history and trends
tables, *Override item history period* and *Override item trend period*
options must be enabled as well as *Enable internal housekeeping* option
for history and trends. Otherwise, the data kept in these tables will
still be stored in partitions, however, the housekeeper will be cleaning
the history and trends by deleting individual records rather than by
dropping outdated partitions. When dropping of outdated partitions is
enabled, Zabbix server and frontend will no longer keep track of deleted
items and history for deleted items will be cleared when an outdated
partition is deleted.
:::

[Time suffixes](/manual/appendix/suffixes) are supported in the period
fields, e.g. 1d (one day), 1w (one week). The minimum is 1 day (1 hour
for history), the maximum - 25 years.

The *Reset defaults* button allows to revert any changes made.

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