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openhab-addons/bundles/org.openhab.persistence.mapdb
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Holger Friedrich 96d0293913
Declare missing connection attribute (#15016) 
* Declare missing connection attribute
* change mactts, marytts, and picotts to none for consistency

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>
2023-05-23 21:38:13 +02:00
..
src Declare missing connection attribute (#15016) 2023-05-23 21:38:13 +02:00
NOTICE Codebase as of c53e4aed26 as an initial commit for the shrunk repo 2020-09-20 23:57:58 +02:00
pom.xml fix spotless after release (#14014) 2022-12-19 15:22:17 +01:00
README.md [mapdb] Fix "a" typo and use "-" for bullets in docs (#13966) 2022-12-16 11:22:48 +01:00

README.md

MapDB Persistence

The MapDB persistence service is based on a 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.