GS_SEG_DATAFILE_LAYOUT

GS_SEG_DATAFILE_LAYOUT displays the static layout of data files 1 to 5 in segment-page mode. Only an administrator can query the information.

**Table 1** GS_SEG_DATAFILE_LAYOUT columns
Name	Type	Description
version	text	Segment-page version. Default value: 1.0.
seg_storage_type	text	segment indicates common segment-page data. hashbucket indicates hash bucket data.
file_id	integer	Data file ID. Value range: an int4 value in the range [1,5].
section_id	integer	Data section ID of a data file.
section_type	text	Type of the data file section. Value range: file_header indicates the file header. spc_header indicates the space header. map_header indicates the mapping header. map_pages indicates the mapping page. ip_pages(inverse pointer pages) indicates the reverse pointer page. data_pages indicates the data page.
page_start	bigint	Start page number of the data section.
page_end	bigint	End page number of the data section.
page_count	bigint	Number of pages in the data section.
total_size	bigint	Size of the data section. The unit is byte.