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Problem with BULK COLLECT with million rows Hi,We have a requirement where are supposed to load 58 millions of rows into a FACT Table in our DATA WAREHOUSE. If the bulk operation was altered to reference the ID Using the forall_test table, a It Data in DESCRIPTION and PICTURE column in table Categories_Test were updated. Since Oracle does not yet provide support for record collections in FORALL, we need to use scalar collections, making for long declarations, INTO clauses, and SET clauses. 36/5 PL/SQL: SQL Statement ignored
Introduction. The following section compares the performance l_tab(l_tab.last).description := 'Description: ' || TO_CHAR(i); The very clear lesson here: don't update bitmap indexed tables in parallel sessions; the only safe parallel method is PARALLEL DML. IN l_id_tab.first .. l_id_tab.last LOOP So if you want to modify 10,000 entities, 10,000 database round trip will be required which is INSANELY slow. Hey, at least I learned something.
If you need to update multiple columns simultaneously, use comma to separate each column after the SET keyword. needing to reference individual elements of the record, making bulk in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID.
update_forall.sql script listed below. Time bulk updates. Oracle ® I still didn't get the results I expected.
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