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gateway (1) A shared portal from a local network into a larger information resource such as a large packet-switched information network or a mainframe computer. (2) A common node on two networks that serves as a medium for communications between nodes on two networks. Because gateways normally process information at a high level, the lower levels of the networks may differ dramatically. For example, an OS/2 computer will frequently serve as a gateway between a PC LAN and a wide-area SNA network. (3) An application program that implements protocols to exchange objects between a server and an otherwise incompatible target system. See also gateway server.

Gateway Data Definition Language (GDDL) In Oracle Open Gateway Technology, the data definition language that maps target system objects to Oracle database objects. SQL-based gateways do not need GDDL.

gateway data dictionary A data dictionary that is created and maintained using the Transparent Gateway Administrator utility. A gateway data dictionary is required when the data source does not have a dynamic data dictionary. SQL-based gateways do not need a gateway data dictionary.

gateway data dictionary server An Oracle7 Server that stores the gateway data dictionary. Such a server may be used for other applications, and may also be an integrating server.

gateway datatype In Oracle Open Gateway Technology, a conceptual datatype that maps the conversion of a target system datatype to an Oracle datatype, and vice versa.

gateway initialization file A file that contains gateway initialization parameters. It is similar to an Oracle7 initialization file.

gateway initialization parameter A parameter in a gateway initialization file that specifies a start-up value for a gateway server.

gateway intermediate layer See intermediate layer.

gateway server A server that can be used by one or more integrating servers to access a target system. See also gateway.

gateway service layer See service layer.

GDDL Gateway Data Definition Language.

GDDL definition A set of GDDL clauses that specifies how an Oracle gateway should interpret a single object in the target system.

GDDL source A source of data (such as an ASCII file or EBCDIC dataset) that contains one or more GDDL definitions. SQL-based gateways do not need a GDDL source.

general entity Used to reference text or previously defined markup instructions within the body of an SGML document. General entities are referenced using the `&' character.

generate (1) (File menu) To convert the report definition into a binary file. (2) To write a display to a file or database in a binary format that can be executed by the Oracle Graphics Runtime and Batch executables.

generic attribute A view attribute that is common to all views, regardless of the view type.

generic identifier (In SGML) The "name" used to identify a defined element, attribute, or entity.

generic string A representation of a string from a character set. The number of bytes required to represent a single character in a generic string is not constant and may be greater than one.

GENREP Executable that converts a report definition into a binary file, even without a database. GENREP is used in conjunction with RUNREP, which runs a report.

gigabyte (Gb) Equivalent to a thousand megabytes, or 1,000,000 bytes.

gigacache An optional, distributed cache shared by all instances of an ORACLE Parallel Server on the nCUBE 2 supercomputer. The gigacache can run on multiple nodes in the ORACLE subcube. hashed lock A distributed lock assigned to one or more database blocks on a file-by-file basis, according to a hashing function. The init.ora parameter gc_files_to_locks specifies the correspondence between files and locks.

global variable A logical container that exists across an application (form, menu, and library objects). When an application uses a global variable, the application maintains the variable until the application is exited, or until another object explicitly removes it.

Go list A list of all allowable terms in the index. See also Pass list.

grant To give a user access to modules. Only a module's creator can grant its access to other users.

Grant A facility to enable users to have certain access rights to information, either in the CASE*Dictionary or in a database. See also CASE*Dictionary Manager and Access Control.

GRANT option The option to pass on to other database users privileges that you have been granted. This option is granted using the SQL statement GRANT ... WITH GRANT OPTION.

grant/revoke An option (grant) from the Oracle Data Browser File menu that you use to let others access your query, if the query is stored in an ORACLE database. You can withdraw the Grant option using the Revoke command.

graphics attribute An attribute that determines some aspect of the style in which a drawing is rendered, such as the line width, font, fill pattern, transfer mode, and so on.

graphics state A global entity that affects how a drawing is rendered. It is defined by the values of the graphics attributes.

greatest lower bound The lowest classification and the intersection of the categories of two or more labels.

gridlines The lines that separate rows and columns in the Oracle Data Browser results window. When all gridlines are turned on, your data appears as a series of cells. You can turn gridlines on and off using the Options... command from the Layout menu.

group (1) An object that is composed of several other objects. (2) A data model object that determines the hierarchy of the data appearing in a report; used primarily for creating breaks in a report, as well as for resetting calculations. (3) To separate the rows in a query into sets, based on their values in one or more columns.

GROUP BY Optional clause of a SELECT statement that identifies the level of summarizing to be performed before fetching data from the database.

GROUP function A SQL function that computes a single summary value from the individual values in specified groups of rows. Examples are AVG, MAX, or SUM.

group name (Group and Column Definitions) The name of a group. Groups are named so they can be referenced by other objects.

group tree A hierarchical model-similar to a "family tree"-that describes the relationships between group objects and the objects that compose them. See also antecedent, child, descendant, parent, and sibling.

group's query The query that selects data for the group. By definition, that query must be the group's query.

GUI (Graphical User Interface) Also known as a bit-mapped interface.

handle An internal pointer to a button procedure, display, layer, object, query, sound, chart template, timer, or window. In order to modify one of these items programmatically, you must pass its handle as an argument to the appropriate Oracle Graphics built-in subprogram.

handshaking Acknowledgement codes used by communicating computers to ensure that they are synchronized.

hash clusters Cluster table data similar to normal, index clusters. However, a row is stored in a hash cluster based on the result of applying a hash function to the row's cluster key value. All rows with the same hash key value are stored together on disk. Hash clusters are a better choice than using an indexed table or index cluster when a table is often queried with equality queries (e.g., return all rows for department 10). For such queries, the specified cluster key value is hashed. The resulting hash key value points directly to area on disk that stores the specified rows.

header An optional report region containing the introductory pages of the report (appearing before the body of the report).

heading In SQL*Plus, text that names an output column, appearing above the column.

headline A title of a Bulletin Board article, topic of a Product Change Request, or summary of a mail message.

help Any information offered by a computer program to give the user helpful information. In many products a standard function key is assigned to request HELP, for example, to display information about the current field.

Help menu Provides access to online help systems of.SQL*ReportWriter, Oracle Project Manager, and CASE*Designer.

help screen/information window A whole screen or window of helpful information about such things as a field, facility or button.

heterogeneous computing Term used to describe a computing environment consisting of systems made by different vendors, typically running different operating systems.

heterogeneous networks Term used to describe networks running different communications protocols and/or different media.

hidden (Field Definition/Properties) Property that specifies whether SQL*ReportWriter will print or suppress the indicated field in the location implied by the field settings. If enabled, the field will appear only when manually referenced in text objects (using & fieldname).

hierarchical naming model An Oracle Names infrastructure in which names are divided into multiple hierarchically related domains.

history note Can be used in a Thesaurus for documenting meaning (or changes in meaning) of a term.

hitlist An automatically generated list showing the results of a search. It will display details of how many occurrences (hits) of the query have been found and in which documents.

HLI (High level interface) See call interface.

hop A portion of a connection path. It may be between two communities, between two Interchanges, or between an Interchange and the destination. Or, the path may simply have one hop, from the initiator directly to the destination.

horizontal partitioning A method of spreading database rows across database nodes, based on actual data values in the rows, so that some rows of a table are stored on one node, and other rows on another node. May improve space use and performance if rows are stored at the node where they are most frequently accessed. See also vertical partitioning.

horizontal scrolling A SQL*Forms feature that enables a field to display a value longer than the field itself. SQL*Forms displays the value a portion at a time by scrolling the entire value back and forth within the field, at the request of the user.

horizontal sizing (Layout objects) Setting that determines how the horizontal size of the layout object will change at runtime to accommodate the objects or data within it. Valid options are Contract, Expand, Fixed, and Variable.

horizontal spacing (Repeating Frame Definition) The number of characters that should appear horizontally between instances of a repeating frame.

host (1) (File menu) Temporarily suspends the current SQL*ReportWriter session and accesses your operating system command prompt. (2) A computer that provides a shared resource on a network. (3) The host computer for the nCUBE 2 supercomputer is a required front-end workstation used for system administration and program development. In a networking context, a host computer serves network clients. For example, an nCUBE 2 supercomputer running ORACLE is a host in the sense of being a database server to clients on the network; it also requires a host workstation as a front end. See also server computer.

hostname The name or alias of the host system to which you want to connect.

hosts file A file used by most commercially available implementations of TCP/IP that identifies the Internet addresses of the available hosts on the network.

hypercube The topology of the nCUBE 2 supercomputer, which consists of an n-dimensional cube with an independent processing node at each vertex (2n nodes). The processing nodes use a common high-speed interconnection to communicate with each other and with I/O nodes.

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