Delete selectivity <percentage>%: <number_of> deletes, <number_of> rows read, <number_of> rows qualified
Update selectivity <percentage>%: <number_of> updates, <number_of> rows read, <number_of> rows qualified
The ratio of read rows to modified rows is poor for UPDATE or DELETE statements.
Before UPDATE and DELETE statements can modify or delete rows, the rows must be located in the table. The same access strategies are used as in a SELECT statement.
Find the statement that causes this poor ratio of read rows to found rows, and check the access strategies for this statement.
For information on creating optimized SQL statements, see the SQL Optimizer documentation.