From e99e05f45b50bf40bbcb8c401f9ff42249361f18 Mon Sep 17 00:00:00 2001 From: "github-actions[bot]" <41898282+github-actions[bot]@users.noreply.github.com> Date: Sat, 15 Jan 2022 10:14:45 +0100 Subject: [PATCH] Update persistence.md (#1737) (#1738) Make clear that openHAB ships with RRD4J installed and running by default. Make clear that the default persistence service is used by charts and rules. Co-authored-by: digitlength <62958838+digitlength@users.noreply.github.com> --- configuration/persistence.md | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/configuration/persistence.md b/configuration/persistence.md index ad33189ae..d25a46ab8 100644 --- a/configuration/persistence.md +++ b/configuration/persistence.md @@ -8,6 +8,8 @@ title: Persistence openHAB can store data over time; this is known as persistence. The data may be retrieved at a later time, for example to restore your system after startup, or to prepare graphs for display on a UI. +openHAB ships with the [rrd4j persistence service](addons/persistence/rrd4j/) installed by default, which persists every Item on every state change and at least once a minute. Additionally, it restores the last stored value at system startup. To change this behaviour see [Persistence Configuration](#persistence-configuration). + openHAB persists Item states in a database, and most popular databases are supported. You may have more than one persistence add-on loaded, and each of these may be configured independently. @@ -17,8 +19,7 @@ Please refer to the [available persistence service add-on](/addons/#persistence) ## Default Persistence Service -It is important to select a default persistence service. -You should do this even if you have only one persistence add-on installed. +You should configure a default persistence service even if you have only one persistence add-on installed. The default persistence service is used to provide data for the UI charting features and rules (you may choose to use another persistence service in either of these, configured on a case-by-case basis). To select a default persistence service, in UI, select `Settings->Persistence`. Select your default service from the drop-down list.