Oracle cursor for updating every row in same table No loging in free sex chat
Bulk binds can improve the performance when loading collections from a queries.The SET SERVEROUTPUT ON DECLARE TYPE t_bulk_collect_test_tab IS TABLE OF bulk_collect_test%ROWTYPE; l_tab t_bulk_collect_test_tab := t_bulk_collect_test_tab(); l_start NUMBER; BEGIN -- Time a regular population.The set of rows the cursor holds is called the set.
For example this: That function, the LEFT operation on the column, results in this execution plan: This took 316 reads to find the correct data over about 9ms (I have very fast disks), all because it must process each and every row to determine where the information matches the function. Either don’t use functions in comparisons, or use ones that are sargeable. It appears, at first blush, like this marvelous mechanism that’s going to allow you to use T-SQL like a real programming language, not just a scripting language.You can build these functions and then have them call each other and your code will be very reusable, unlike those nasty old stored procedures. Until you try to run your code with more than a few rows.The problem here is that the multi-statement user defined function (UDF) is designed around the table variable.They are also created when a SELECT statement that returns just one row is executed.They must be created when you are executing a SELECT statement that returns more than one row.
l_start := DBMS_UTILITY.get_time; FOR cur_rec IN (SELECT * FROM bulk_collect_test) LOOP l_tab.extend; l_tab(l_tab.last) := cur_rec; END LOOP; DBMS_OUTPUT.put_line('Regular (' || l_tab.count || ' rows): ' || (DBMS_UTILITY.get_time - l_start)); -- Time bulk population.