GLOBAL_STATIO_SYS_TABLES

GLOBAL_STATIO_SYS_TABLES displays I/O status information about all system catalogs in namespaces on each node, as described in Table 1.

**Table 1** GLOBAL_STATIO_SYS_TABLES columns
Name	Type	Description
node_name	name	Node name
relid	oid	Table OID
schemaname	name	Name of the schema that contains the table
relname	name	Table name
heap_blks_read	bigint	Number of disk blocks read from the table
heap_blks_hit	bigint	Number of cache hits in the table
idx_blks_read	bigint	Number of disk blocks read from all indexes in the table
idx_blks_hit	bigint	Number of cache hits in the table
toast_blks_read	bigint	Number of disk blocks read from the TOAST table (if any) in the table
toast_blks_hit	bigint	Number of buffer hits in the TOAST table (if any) in the table
tidx_blks_read	bigint	Number of disk blocks read from the TOAST table index (if any) in the table
tidx_blks_hit	bigint	Number of buffer-hits in the TOAST table index (if any) in the table