GLOBAL_COLUMN_TABLE_IO_STAT

GLOBAL_COLUMN_TABLE_IO_STAT provides I/O statistics of all column-store tables in the current database. The names, types, and sequences of the columns in the view are the same as those in the GS_COLUMN_TABLE_IO_STAT view. For details about the columns, see Table 1. The value of each statistical column is the sum of the values of the corresponding columns of all nodes.

**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