The Oracle documentation includes the following advice: A bitmap index should be built on each of the foreign key columns of the fact table or tables In that reference, there is even a bitmap ...
I want to model a relationship between Customer and Transaction. However, because Customer is only described by a unique string and no extra info, I have two possibilities to implement it in the ...
I have the following DML: UPDATE rc_usutb011 u SET cod_ant=( SELECT cod_hst FROM rc_pdptb101 p WHERE ocip_hst=ocip_ant AND p.sector=u.sector ); The explain plan ...
I have this query and I want to increase its performance by adding appropriate Indexes. DELETE FROM MYTAB1 WHERE MYID1 IN ( SELECT MYID2 FROM MYTAB2 ); I am not familiar with the ...
We have a relatively classic scenario where the date clause of the query generated by the application uses a "greater than" for a given date. Because there is no end clause to the date range, oracle ...