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GLOBAL_GS_SEG_SEGMENTS

Updated on 2024-06-03 GMT+08:00

GLOBAL_GS_SEG_SEGMENTS displays the segment information of all tablespaces on all nodes, including the table, index, TOAST and TOAST INDEX segments, and fsm fork and vm fork segments. It can only be executed on the CN. Only an administrator can query the information.

Table 1 GLOBAL_GS_SEG_SEGMENTS columns

Name

Type

Description

node_name

text

Node name.

schema_name

name

Namespace to which a segment belongs.

segment_name

name

Segment object name, which is obtained from pg_class and relname in pg_partition.

partition_name

name

Partition name of the segment object; NULL if the segment object is not partitioned. Source: pg_partition.relname.

forknum

integer

Fork type of a segment object. The options are as follows:

  • 0: main fork
  • 1: fsm fork
  • 2: vm fork

segment_type

text

Segment object type. Value range:

  • table: segment-page ordinary table
  • table partition: segment-page partitioned table (main table and child table) and segment-page level-2 partitioned table (level-1 partitioned table)
  • table subpartition: segment-page level-2 partitioned table (top node table and level-2 partitioned table)
  • index: index of a segment-page ordinary table
  • index partition: index of a segment-page partitioned table or level-2 partitioned table
  • global partition index: global index for segment-page partitioned tables and level-2 partitioned tables
  • toast: segment-page TOAST table
  • toast index: index of a segment-page TOAST table

tablespace_name

name

Tablespace to which a segment object belongs.

bucketnode

integer

  • 0 to 1023 indicate the bucket nodes of a hash bucket table.
  • 1024 indicates the bucket node of a segment-page ordinary table.
  • 1025 indicates the bucket node of a segment-page global temporary table.
  • 1026 indicates the bucket node of a segment-page unlogged table.
  • 1027 indicates the bucket node of a segment-page local temporary table.

head_block_id

bigint

Page number of the segment header.

contents

text

Storage content of a data file. The options are as follows:
  • permanent: permanent
  • unlogged: no log
  • temporary: global temporary
  • temporary2: local temporary

table_name

name

Name of the base table to which a segment belongs.

blocks

bigint

Number of logical pages of a segment.

total_blocks

bigint

Number of physical pages of a segment.

extents

integer

Number of logical extents of a segment.

total_extents

integer

Number of physical extents of a segment.

head_lsn

text

Segment header LSN.

level0_slots

bigint[]

Level-0 slot array of segment extent mapping.

level1_slots

bigint[]

Level-1 slot array of segment extent mapping.

fork_head

bigint[]

Fork head array of a segment.

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