<number of> selects and fetches, selectivity <percentage>%: <number of> rows read, <number of> rows qualified
The strategies for accessing table data are poor for SELECT or FETCH statements. The system has to read a large number of table rows to find a small number of rows that fulfill a WHERE condition.
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.