• Empty DB, existing directory Load the DB from the existing directory
• Full DB, empty directory Create snapshots for all sources in directory

Options:

access(+AccessMode)

One of auto (default), read_write or read_only. Read-only access implies that the RDF store is not locked. It is read at startup and all modifications to the data are temporary. The default auto mode is read_write if the directory is writeable and the lock can be acquired. Otherwise it reverts to read_only.

concurrency(+Jobs)

Number of threads to use for loading the initial database. If not provided it is the number of CPUs as obtained from the flag cpu_count.

max_open_journals(+Count)

Maximum number of journals kept open. If not provided, the default is 10. See limit_fd_pool/0.

directory_levels(+Count)

Number of levels of intermediate directories for storing the graph files. Default is 2.

silent(+BoolOrBrief)

If true (default false), do not print informational messages. Finally, if brief it will show minimal feedback.

log_nested_transactions(+Boolean)

If true, nested log transactions are added to the journal information. By default (false), no log-term is added for nested transactions.\\

Errors

- existence_error(source_sink, Directory)

- permission_error(write, directory, Directory)