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RelStorage Plone Zope RDB Storage Backend

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RelStorage Plone Zope RDB Storage Backend

  1. 1. RelStorage Plone Relational Database Storage Backend
  2. 2. Overview ● Drop-in replacement for FileStorage or ZEO ● For PostgreSQL, MySQL, Oracle, SQLite ● settled: around for ~13 years ● Active development driven by Jason Madden: Version 3 released 2019 Latest release 3.4.0 in October 2020
  3. 3. PostgreSQL the Cloud DB ● Kind of „Industry Standard“. ● Well supported by all big cloud providers: AWS, Google, Azure, IBM, Heroku, ... ● Easy to install in private clouds (or local): Docker, Kubernetes, ... ● Very well maintained and thriving development ● Scaling solutions available
  4. 4. Advantages ● Fast, parallel commits, better concurrency, shorter locks ● Optimized per process caching ● Blobs in database ● Optional history free
  5. 5. Usage: Setup ● „plone.recipe.zope2instance“ buildout support minimal example [instance] eggs += RelStorage psycopg2 sharedblobs = false rel-storage = type postgresql dsn dbname='plone' host='localhost' user='plone' password='secret' keep-history false
  6. 6. Usage: Caches ● additional client side caches ● shared between all threads of process ● Optional compressed ● Parameters to limit size, object count and max-size of objects in this cache
  7. 7. Converting from FS or ZEO ● „zodbconvert“ converts from any storage to another, like from ZEO to RelStorage ● Needs configuration file providing connections to both storages ● Also converts blobs if needed
  8. 8. Packing ● ZODB keeps old transactions, so packing is needed ● In history free mode only deleted objects need to be cleaned up (DB bloats less) ● RelStorage provides a fast „zodbpack“
  9. 9. Versions and Blobs ● RelStorage 3.x is Python 3 only and runs with Plone 5.2+ - Blobs should be stored in RelStorage ● RelStorage 2.x is for Plone 5.0-5.1.x, blobs should not be stored in DB, except for Oracle backends.
  10. 10. Personal Note ● I use RelStorage today for all my live deployments ● Use it since v.1.6 with Plone 4.3 ● Never had problems ● Blazing fast ● DevOps/Sysadmins love it

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