fsdb_persist_ex.md

Example Persistence Layout for FSDB

In this example, there is:

• an object, my_book, which is an AG
  • It has been assigned a fedora id info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e
• a head version contains a folder containing two binaries
• one previous version, which contained only one binary
• an active transaction that adds another folder and binary, and deletes a binary

File system representation

fcrepo_storage/
  5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/
    data
        .fcrepo
            my_book.n3
            my_book/
                pages.n3
                pages/
                    page1.png.n3
                    page2.png.n3
        my_book.n3
        my_book/
            pages/
                page1.png
                page1.png.n3
                page2.png
    versions
        201909201205531033
            .fcrepo
                my_book.n3
                my_book/
                    pages.n3
                    pages/
                        page1.png.n3
            my_book.n3
            my_book/
                pages/
                    page1.png.n3
                    page1.png
    txs
        ptx_8w32rb01s
            .fcrepo
                my_book/
                    pages.n3
                    pages/
                        page3.png.n3
                    admin.n3
                    admin/
                        rights.txt.n3
            my_book/
                pages/
                    page3.png
                    page3.png.n3
                admin/
                    rights.txt

In memory

• ptx_8w32rb01s
  • delete_log
    • pages/page1.png

DB Index

Storage path index

fedora_uri	fs_path	ag_child	txid	model
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/data	FALSE		ag
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/data/my_book	TRUE		container
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages/page1.png	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/data/my_book/pages	TRUE		binary
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages/page2.png	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/data/my_book/pages	TRUE		binary
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/txs/ptx_8w32rb01s/my_book	TRUE	8w32rb01s	container
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages/page2.png	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/txs/ptx_8w32rb01s/my_book/pages	TRUE	8w32rb01s	binary
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/admin	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/txs/ptx_8w32rb01s/my_book	TRUE	8w32rb01s	container
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/admin/rights.txt	5b/fe/6a/08/5bfe6a08-67d9-4d90-9e50-eeaf86aad37e/txs/ptx_8w32rb01s/my_book/admin	TRUE	8w32rb01s	binary

Version index

fedora_uri	memento_datetime
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e	201909201205531033
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages	201909201205531033
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages/page1.png	201909201205531033
info:fedora/91f6d9c2-dc27-4ab5-b626-df0a45e4519e/pages/page2.png	201909201205531033