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A fixed-length field is a data element assigned a predetermined width and position in a record or data structure. Because its boundaries are defined by a layout, a parser can find it by position rather than by searching for a separator. The exact meaning of its width—and how padding or overlong values are handled—depends on the format, language, or database.
How a fixed-length field works
A fixed-length layout specifies where a field begins and how many bytes or characters it occupies. Each record uses those same positions, so a reader can move through the record according to the layout. IBM describes fixed-format records as having fields that start and end in the same places in every record in its Informix 12.10 documentation.
For example, a file specification might assign an account code 8 characters, a status 1 character, and an amount 7 characters. A parser can read each field from its assigned position. This example describes the layout only: the file specification must establish the width units, encoding, and any padding rules.
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How a fixed-length field differs from a fixed-length record
A fixed-length field has a predetermined width within a larger structure. A fixed-length record has a predetermined total size. A record may contain multiple fields whose widths add up to that total, along with filler or reserved positions.
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These are related but distinct constraints. IBM’s COBOL for z/OS 6.4 documentation describes fixed-length record definitions for VSAM; record size is specified by the record clause or, under stated conditions, implied by same-sized level-01 records. See IBM’s record-definition guidance for those COBOL and VSAM details.
Fixed-width fields versus delimited fields
In fixed-width data, the layout tells the reader each field’s position and width. In delimited data, a separator—such as a comma—marks a boundary, so a field’s length can vary. Fixed positions can make a format straightforward to parse when every producer and reader follows the same specification; delimiters avoid reserving a particular width for each value. The right choice depends on the interchange format and its requirements.
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Oracle’s older SQL*Loader documentation describes fixed-format records as having the same byte length, with each specified field assigned a position, type, and length. That is a description of the documented SQL*Loader format, not a universal rule for every fixed-width system: Oracle SQL*Loader Concepts.
Does fixed length mean padding with spaces?
Not in every system. Padding and trimming are implementation-specific. For example, Oracle Database 26 documents its CHAR datatype as fixed-length character data, fixed for every row with trailing blanks; its VARCHAR2 datatype is variable-length. Oracle’s character-size units depend on the character set. These semantics apply to Oracle Database, not automatically to other databases. See Oracle’s datatype documentation.
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Host variables and external records can behave differently from database columns. Oracle’s Pro*COBOL documentation for Database 19 says that fixed-length host variables are blank-padded on output, while PICX settings affect whether trailing blanks are stripped on input. Identify the layer you mean—a database column, a language variable, or a file record—before assuming how spaces are treated. See Oracle’s Pro*COBOL datatype guidance.
Does the width count bytes or characters?
It depends on the representation. A width of 10 may mean 10 bytes or 10 characters. This distinction matters for non-ASCII text because one character may occupy multiple bytes.
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Oracle Database 26 allows a CHAR size to be specified in bytes or characters, depending on the national character set and declaration. IBM’s Enterprise COBOL for z/OS 6.5 guide distinguishes UTF-8 fixed character-length items from fixed byte-length items: character-length items require storage based on a maximum of four bytes per character, while byte-length handling must account for character boundaries. Consult the relevant platform documentation—IBM’s Enterprise COBOL 6.5 guide or Oracle Database 26 datatypes—when sizing buffers or defining an interchange format.
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There is no universal overflow rule. A system may reject, truncate, or otherwise handle an over-width value according to its own specification, so validate values before writing them and check the target format’s documentation.
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One documented example is Oracle Pro*COBOL: in the described CHARF cases, an input value longer than the target database column’s defined width causes an error, while output to a shorter host variable is truncated before assignment. Those behaviors are specific to the documented Oracle context; they should not be assumed for other formats or products. Details appear in Oracle’s Database 19 Pro*COBOL documentation.
When is a fixed-length field useful?
Fixed-length fields are useful when a file or interface specification assigns stable positions, or when values have a standardized width, such as a code. IBM Informix documents the stable-position approach for fixed-format records; Firebird’s 2.5 language reference gives standard-width codes as an example of a use for fixed-length CHAR. See IBM Informix and the Firebird 2.5 Language Reference.
When choosing or interpreting a layout, check the specification for the width unit, encoding, field positions, padding, and overflow behavior. These properties determine whether the data can be read reliably; fixed or variable length alone does not establish which format is more efficient or preferable.
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