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Raw device
A disk area that can be accessed regardless of the UNIX file system is called a raw device. The raw device is a
character-type special device created using the UNIX utility. It is ordinarily indicated by a node name created under
/dev/rdsk/.
RDB configuration parameter
Information, such as where the RDB directory file is located, that defines the operating environment of a
SymfoWARE/RDB system. Operating environment setup is performed in accordance with the description of the RDB
configuration parameter during when the RDB system is activated.
Related terms:
RDB configuration parameter file
RDB configuration parameter file
A file containing RDB configuration parameters is called an RDB configuration parameter file. The RDB configuration
parameters are used to define SymforWARE/RDB operating environments such as an RDB directory file allocation
destination.
RDB dictionary
A file in which user database definition information is stored. An RDB dictionary is represented in a table like those the
user defines. This table is called a system table.
Related terms:
System table
RDB library
When an application program that uses SQL statements is executed, shared objects provided by the
SymfoWARE/RDB system are called to perform database processing. The shared objects also call shared objects
provided by Windows NT(R) system. The load module of an application program that uses SQL statements must be
dynamically linked to these shared objects. In this manual, these shared objects are called the RDB library.
Read-only cursor
In an SQL data manipulation statement, a cursor that cannot be used to update and delete is called a read-only cursor.
The cursor declaration specifies whether a cursor is read-only. For example, if two or more tables are specified in the
FROM clause of a query specification, the cursor is a read-only cursor.
Related terms:
Updatable cursor
Reference mode
A mode denoting strength of exclusion. Also called shared mode, the reference mode represents the strength of data
locks in data manipulation. Data that is locked in reference mode can only be referenced by other transactions and
cannot be updated. In general, the execution of other transactions waits until a commit is performed on the transaction
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