GLOBAL_REL_IOSTAT

Displays statistics about data file I/Os on all nodes, as shown in Table 1. In the multi-tenancy scenario, global information is returned if this view is accessed in a non-PDB, and information about a PDB is returned if this view is accessed in the PDB. The I/O statistics queried through this view in the PDB are persistent. After the database is restarted, the I/O statistics are not cleared and are accumulated continuously.

**Table 1** GLOBAL_REL_IOSTAT columns
Name	Type	Description
node_name	name	Node name.
phyrds	bigint	Number of times of reading physical files.
phywrts	bigint	Number of times of writing into physical files.
phyblkrd	bigint	Number of times of reading physical file blocks.
phyblkwrt	bigint	Number of times of writing into physical file blocks.
dbid	oid	If the multi-tenancy feature is not enabled, the value is always 0. If the multi-tenancy feature is enabled, the value is the database ID corresponding to a PDB during query in the PDB and is always 0 during query in a CDB.