DB_INFO

COMMAND TYPE : HELP

PURPOSE:

It shows the catalogues of the DIRA database.

DESCRIPTION:

This command inquiries the public data base to retrieve the catalogues available in a computer center. The query can be made selecting catalogues by Name, Band, CDS identifier, type of objects, bibliographic notes and so on. The output can be written on the screen or on a file. The output can be a short list or a full explanation of the catalogues characteristics, included variable list, and the documentation. Moreover this task can be used to verify where the catalogues are stored and if the mount of a tape is required.

When the user works with the DB_INFO command he has to enter commands to use the available options. The first three characters of a command are expressive.

The COMMANDS:

SELECT

This command allows to define constraints on the catalogues characteristics to obtain the list of the desired catalogues only. For example when the user wants to list the available catalogues of QSOs (only) he must use this command to define the search keyword. The constraints set with this command are active for all the DB_INFO session, and can be changed or removed with a new call at the SELECT command.

The user can select catalogues for:

When the SELECT command is called a new window is opened on the screen. The user must fill in the appropriate fields of the window to set the search conditions. The key ?, entered in a field, explains the input values allowed in that field.

OUTPUT

This command defines the output format of the LIST command. The user can select a short list or a full explanation of the catalogue characteristics in the output. Moreover the user can have the output on the screen only or on both the screen and in a file, and can set or disable a 'page' flag to look the screen when this is full.

The user can set flags to have:

The commands: LIST 'namecat' and LIST 'namecat' DOC do not use the flags set with this command because they have a defined output format.

LIST

It writes the data retrieved in the catalogues database using the format defined with the OUTPUT command and according with the search condition sets by the SELECT command. Moreover it can be used to write the documentation file of a catalogue.

The command can be used in three ways:

LIST   Lists all selected catalogues
LIST 'cat'   Lists 'cat' catalogue (ie. LIST UGC)
LIST 'cat' DOC   Lists catalogue documentation (ie. LIST UGC DOC)

VOCABULARY

In the DIRA database a vocabulary of the acronimous used for the names of the catalogue fields has been defined. This commands list these acronimous and allows to search for correspondences between the physical quantities used in astronomy and the field names. The user can try to find what the acronimous means or if a name already defined exists for a physical quantity.

The command can be used in two ways:

VOC  Lists all the vocabulary
VOC 'string'  Types records that contain 'string'

WHERE

The catalogues available in a computer center can be on line on magnetic disk, or can be stored on a tape or on a mountable disk. This command shows where the selected catalogues are stored. Then the user can provide to mount the media when the data are not available on line.

HELP

Provide the help for the commands of this task. Can be used in the format:

HELP command

To have the explanation about a command of DB_INFO

EXIT

Exit from DB_INFO command



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