PGXC_COLUMN_TABLE_IO_STAT

PGXC_COLUMN_TABLE_IO_STAT provides I/O statistics of all column-store tables of the database on all CNs and DNs in the cluster. Except the nodename column of the name type added in front of each row, the names, types, and sequences of other columns are the same as those in the GS_COLUMN_TABLE_IO_STAT view. For details about the columns, see Table 1.

**Table 1** GS_COLUMN_TABLE_IO_STAT columns
Name	Type	Description
schemaname	name	Namespace of a table
relname	name	Table name
heap_read	bigint	Number of blocks logically read in the heap
heap_hit	bigint	Number of block hits in the heap
idx_read	bigint	Number of blocks logically read in the index
idx_hit	bigint	Number of block hits in the index
cu_read	bigint	Number of logical reads in the Compression Unit
cu_hit	bigint	Number of hits in the Compression Unit
cidx_read	bigint	Number of indexes logically read in the Compression Unit
cidx_hit	bigint	Number of index hits in the Compression Unit