Hash Join Overflows


 
Snapshot Level
Database
Application

 
Logical Data Grouping
dbase
appl

 
Monitor Switch
Basic
Basic

Resettable

Yes

 

 
Event Type
Database
Connection

 
Logical Data Grouping
db_event
conn_event

 

Element Name
Element Type

hash_join_overflows
counter

Description:  The number of times that hash join data exceeded the available sort heap space.

Usage:  At the database level, if the percentage of "Hash Join Small Overflows" is greater than 10% of this value, then you should consider increasing the sort heap size. Values at the application level can be used to evaluate hash join performance for individual applications.