16.10 - DUMPDISK - Teradata Database

Purpose

The DUMPDISK command positions Filer at a specified disk block, bypassing the FSG cache, and displays the contents according to the selected display options.

Syntax

/P

Positions to the specified disk segment, but does not display it.

/S

Shows a short formatted display of the disk segment.

/M

Shows a medium-length formatted display of the disk segment.

/L

Shows a long formatted display of the disk segment.

/H

Shows a hexadecimal display of the disk segment.

/V

Verifies the disk segment and displays any errors encountered.

/C

For compressed data blocks, displays the uncompressed DB header information, including extended header information pertaining to data compression.

If the scoped DB is not compressed, the output is similar to the display when the /S option is used.

/Z

For compressed data blocks, displays:

• the uncompressed DB header information, including extended header information pertaining to data compression.
• a hex format display of the compressed data stored in the DB. If the /Z option is not used, the hex display shows the uncompressed data.

If the scoped DB is not compressed, the output is similar to the output when the /x option is used.

cylid

The 64-bit identifier of a cylinder, entered as a 16-character hexadecimal number.

sectornum

The sector number.

sectorcount

The number of sectors to display, starting from sectornum. If sectorcount is omitted, DUMPDISK will display one sector.

=

Filer will use the most recently saved values for cylid, sectornum, or sectorcount.

This option cannot be used unless input values have already been defined for cylid, sectornum, or sectorcount. For more information, see Stored Input Values.

DIRECTSTORAGE

Forces block to be read directly from disk subsystem, rather than from the EIO cache.

The EIO cache is an additional, fast, read-only I/O cache that exists between the PDE FSG cache and the disk storage subsystem on some platforms.

Usage Notes

If the type is invalid, the block is displayed in the hexadecimal format. This command differs from the BLK command because FSG cache is always bypassed.