Creates an MPE file containing data from the the IMAGE data entries referenced in the current select file.
Discussion |
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The SAVE command creates a new MPE file containing the IMAGE data
entries selected by the most recent retrieval command. This select
file is saved as a self-describing (SD) file which means that its user
label contains information about its contents in a standard format.
Refer to Appendix E for further discussion on self-describing files.
If a file with the specified name already exists, the select file is not
saved and the command terminates. If you terminate the command with
a CONTROL Y, the existing file is not overwritten and the select file
is not saved.
QUERY's internal select file consists only of record numbers. However, when you use the
SAVE command, the data, from the entries that qualified when the retrieval command was executed, is copied into the file. This file can then be used by other subsystems such as DSG/3000. The select file and the data in the database remain unchanged by the SAVE command.
Saving Multiple Data Set Select Files |
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The combined length of the non-compound data entries forming a compound
data entry cannot exceed 2047 words. The maximum number of data items
that can be contained in a compound data entry is 510. To
save a multiple data set select file, the previous JOIN command
cannot contain any @ signs.
A data item name can belong to only one data set named in the JOIN
command unless both of the following are true:
The data set and data item are both named in a data item
equivalence for all the data sets named in the JOIN command that
contain that data item.
The data item is not a compound item.
