demus/openhab-addons
1
0
Fork 0
mirror of https://github.com/openhab/openhab-addons.git synced 2025-01-10 15:11:59 +01:00
Code Issues Packages Projects Releases Wiki Activity

[mapdb] Add some documentation (#13964)

Browse Source 
This is based on the original OH1 documentation.

Signed-off-by: Wouter Born <github@maindrain.net>
This commit is contained in:
Wouter Born 2022-12-15 23:39:37 +01:00 committed by GitHub
parent d6db72774a
commit 15ad22b5ad
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
bundles/org.openhab.persistence.mapdb/README.md Normal file
View File

@ -0,0 +1,12 @@
# MapDB Persistence
The [MapDB](https://mapdb.org/) persistence service is based on simple key-value store that only saves the last value.
MapDB is useful for restoring items that have the `restoreOnStartup` strategy because other persistence options have some drawbacks if only the last value is needed on restarts.
Some disadvantages of other persistence services compared to MapDB are that they:
* grow in time
* require complex installs (`influxdb`, `jdbc`, `jpa`)
* `rrd4j` cannot store all item types (only numeric types)
It is only possible to query the last value and not other historic values because the MapDB persistence service can only store one value per item.