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Record Format For Physical And Logical Files

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The database-file-name parameter is required. It is the name of the physical or logical file from which the previously defined record format is taken. Deciding to use a join logical file is more complicated, primarily because a join file is read only. If your program needs to access a record for update, and there are related The field must appear in both the physical file record format and the logical file record format. Select/omit statements must follow all field and key field level entries for the record format.

Describing IBM i logical file record formats

DDS Logical Files with More than One Record Format: When you specify more than one record format in a logical file, you must specify at least one key field for every record format in the

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Physical files can contain only one record format, but logical files can contain many. If you need to combine the records contained in several files into a single file, whether or not they have the

You can use this field-level keyword to specify that a field name in the logical record format that you are defining is different from its corresponding physical-file field name. A physical record is a unit of data that is treated as an entity when moved into or out of storage. The size of a physical record is determined by the particular input-output device on which it is

A logical file record format can change the length and data type of fields that are stored in physical files. The system does the necessary conversion between the physical file field description and A physical record is a unit of data that is treated as an entity when moved into or out of storage. The size of a physical record is determined by the particular input-output device on which it is

Many of the functions that you can specify for externally described files (such as the CHAIN operation) operate on either a file name or a record-format name. Each file and unqualified If the corresponding field in the physical file record format has a data type of binary with decimal positions greater than zero, the length cannot be overridden in the logical file.

RANGE is specified as a select/omit keyword for CODEA, which is a 1-byte field. Records from physical file PF1 are retrieved through this record format only if the value of field CODEA is

You can avoid compiling again by creating a logical file that presents data to your programs in the original record format of the physical file. Using this approach, the logical file has the same

The database-file-name parameter is required. It is the name of the physical or logical file from which the previously defined record format is taken.

1 When a first-changed-first-out (FCFO) access path is specified for the file, the maximum value for the size of the key for physical and logical files is 32 763 for ACCPTHSIZ (*MAX1TB) and A logical file contains no data, but it defines record formats for one or more physical files. You can create various logical files and describe their record formats and access paths using data A logical file contains no data, but it defines record formats for one or more physical files. You can create various logical files and describe their record formats and access paths using data

When you specify more than one record format in a logical file, an additional byte for the first *NONE key field position is required. An additional byte might also be required for each In a multiple-format logical file, a record format can use only the fields common to all the physical files specified on the PFILE keyword for that record format.

Keep in mind that performance can suffer as you approach some of these maximums. For example, the more logical files you have built over a physical file, the greater the chance that With a join logical file, the application program does one read operation (to the record format in the join logical file) and gets all the data needed from both physical files. Without the join

The database-file-name parameter is required. It is the name of the physical or logical file from which the previously defined record format is taken.

I’ve started to do some programming in ILE RPG and I’m curious about one thing – what exactly is the record format? I know that it has to be defined in physical/logical/display

Summary of Rules for Join Logical Files Requirements The principal requirements for join logical files are: Each join logical file must have: Only one record format, with the JFILE

When you specify more than one record format in a logical file, an additional byte for the first *NONE key field position is required. An additional byte might also be required for each In a multiple-format logical file, a record format can use only the fields common to all the physical files specified on the PFILE keyword for that record format. Join logical files Only one record format name can be specified. Specify the record format name as the name of a new record format with field names specified in this logical file. Every field in

Are you asking about a multiple format logical file –or– a multi membered physical file. Please let us know Thanks Jamie thanks, i want to know about multiple format

DDS Logical Files with More than One Record Format: When you specify more than one record format in a logical file, you must specify at least one key field for every record format in the

The Display File Description (DSPFD) command shows one or more types of information retrieved from the file descriptions of one or more database and/or device files. The information is Keyword entries are typed in positions 45 through 80 (functions). Most of the keywords are valid for both physical and logical files. Some, however, are valid only for physical files, and some