ISAM Files Cannot Be Opened by Multiple Networked Workstations (68339)


The information in this article applies to:

  • Microsoft Basic Professional Development System (PDS) for MS-DOS and MS OS/2 7.0
  • Microsoft Basic Professional Development System (PDS) for MS-DOS and MS OS/2 7.1
This article was previously published under Q68339

SUMMARY

The note on page 336 of the "Microsoft Basic 7.0: Programmer's Guide" for Microsoft Basic Professional Development System (PDS) versions 7.0 and 7.1 incorrectly states that you can open an ISAM database for read-only by one Basic process and then have another Basic process open it for reading as well.

If a database is already open, the ISAM engine will generate a "Permission denied" error when another process attempts to open the database. If the first process closes the file, then the second process can access it.

This information apples to Microsoft Basic PDS versions 7.0 and 7.1 for MS-DOS and 7.1 for MS OS/2.

MORE INFORMATION

Note that "processes" refer to two separate programs or users attempting to access a file on a network server. However, this can also apply to two separate programs under multitasking, systems such as OS/2 or Microsoft Windows.

For an in-depth explanation of why Basic PDS 7.1 does not yet support multiuser ISAM, query on the following words:

why and Basic and multiuser and ISAM

Modification Type:MajorLast Reviewed:10/20/2003
Keywords:KB68339
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