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https://github.com/zopefoundation/zc.beforestorage/workflows/tests/badge.svg\n        :target: https://github.com/zopefoundation/zc.beforestorage/actions?query=workflow%3Atests\n\n\n==============\nBefore Storage\n==============\n\nZODB storages typically store multiple object revisions to support\nfeatures such as multi-version concurrency control and undo.  In the\ncase of the mod popular storage implementation, old revisions aren't\ndiscarded until a pack.  This feature has often been exploited to\nperform time travel, allowing one to look at a database as it existed\nin at some point in time.  In the past, this has been possible with\nfile storage by specifying a time at which to open the file\nstorage. This works fairly well, but is very slow for large databases\nbecause existing index files can't easily be used.  Time travel is\nalso supported for individual objects through the ZODB history\nmechanism.\n\nThe introduction of multi-version concurrency control provided new\nopertunities for time travel.  Using the storage loadBefore method,\none can load transaction records written before a given time.  ZODB\n3.9 will provide an option to the database open method for opening\nconnections as of a point in time.\n\nDemo storage can be quite useful for testing, and especially staging\napplications. In a common configuration, they allow for storing\nchanges to a base database without changing the underlying database.\nZope functional testing frameworks leverage demo storages to easily\nroll-back database state after a test to a non-empty state before a\ntest.  A significant limitation of demo storages is that they can't be\nused with base storages that change.  This means that they generaly\ncan't be used with ZEO.  It isn't enough to have a read-only\nconnections, if the underlying database is still being changed by\nother clients.\n\nThe \"before\" storage provides another way to leverage the loadBefore\nmethod to support time travel and a means to provide an unchanging\nview into a ZEO server.  A before storage is a database adapter that\nprovides a read-only view of an underlying storage as of a particular\npoint in time.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fzopefoundation%2Fzc.beforestorage","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fzopefoundation%2Fzc.beforestorage","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fzopefoundation%2Fzc.beforestorage/lists"}