Remote System Information › HP NonStop (Tandem) › Types of Files Supported—HP NonStop (Tandem)

Types of Files Supported—HP NonStop (Tandem)

CA XCOM Data Transport for HP NonStop supports the following file types through ENSCRIBE, Tandem's disk file architecture:

• Edit files
• Unstructured files

  Unstructured files are large-byte arrays. Data in these files is accessed by using the relative byte address and the READ-COUNT or WRITE-COUNT parameters in the system procedure calls. The application program determines the way in which they are used. An EDIT file is a type of unstructured file signified by the file code 101.

  For more information about ENSCRIBE and unstructured files, see the ENSCRIBE Programmer's Guide.

• Structured files

  CA XCOM Data Transport supports entry-sequenced, relative, and key-sequenced structured files:

  • Entry-sequenced files

    Entry-sequenced files are sequential files. Records are stored in the order in which they are entered. These records are variable in length and cannot be added or deleted. They are accessed by their record address.

  • Relative files

    Relative files are ordered by relative record number. The space allocated for each record is specified when the file is created. Records in these files can be deleted and added again in place.

  • Key-sequenced files

    Key-sequenced files are supported only for the Replace operation. The file must already exist for CA XCOM Data Transport to perform an action on it.