GS_COLUMN_TABLE_IO_STAT

GS_COLUMN_TABLE_IO_STAT displays the I/O of all column-store tables of the database on the current node. The value of each statistical column is the accumulated value since the instance was started.

**Table 1** GS_COLUMN_TABLE_IO_STAT columns
Column	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