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Applying an alias scheme to records at a local node as well as to records on remote nodes permits remote nodes to be transparent to a user.
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Aliases to Local And Remote Records
Applying an alias scheme to records at a local node as well as to records on
remote nodes permits remote nodes to be transparent to a user.
Normally, a user must specify a node, remote file, and use a communications
protocol to access data at a remote site. This process requires knowledge of the
communication protocol in use, as well as the specific location of the record of
the data type sought.
This can be hidden from the user by maintaining special information in an
alias file for a particular data type. Each record belonging to a particular data
type may have corresponding records that keep track of different names (aliases)
for that record. Remote records may have aliases at the local node that contain
the information necessary to fetch the record at the remote node. For a Get
operation, if one of the records is located on a remote node, the alias file is
checked to retrieve information necessary to fetch the record. The remote
directory is then remote mounted to a local directory to allow the sought record(s)
to be accessed. Once the record transaction is complete, the remote directory is
Local records may also have aliases (not necessarily derived from the fields
in the record) to allow for a consistent approach to fetching local and remote
records of the same data type. This consistency manifests itself in the
corresponding alias file to a particular data set since the alias file is checked on
all queries (lo...