GS_STAT_DB_CU displsys CU hits in a database and in each node in a cluster. You can clear it using gs_stat_reset().

**Table 1** GS_STAT_DB_CU columns
Name	Type	Description
node_name1	text	Node name
db_name	text	Database name
mem_hit	integer	Number of memory hits
hdd_sync_read	integer	Number of hard disk synchronous reads
hdd_asyn_read	integer	Number of hard disk asynchronous reads