Updating millions of rows bulk collect Webcam adultos

08-Nov-2016 18:38

if you don't have an index on the "active" column, each "update" will be forced to restart a full table scan from the beginning just to find the next 1000 records that still need to be updated.This other approach I am proposing uses some advanced PL/SQL features you, as a learner, mighy be interested in (rowid, "table of",cursor bulk fetches and "forall") and does only one scan of the table to be updated so (in case of absence of indexes) it performs better than the previous approach.t_update main_tbl set date_origin = to_date('23-JAN-2012','DD-MON-YYYY') where rowid = t_rec(i) ; commit ; end loop; close c_rec; end; / thanks Ben!this seems like a great approach, for some reason the code is bombing in forall i in t_rec.first ..

What is the most efficient and fast way to update from one table to another where the values are DIFFERENT.Eg: Table 1 has 4 NUMBER columns with a high precision eg : 0.2212454215454212 Table 2 has 6 columns.update table 2's four columns based on common column on both the tables, only the different ones. I'm trying to obfuscate the table's VARCHAR2 columns with random alphanumerics for every record on the table.My procedure executes successfully on smaller datasets, but it will eventually be used on a remote db whose settings I can't control, so I'd like to EXECUTE the UPDATE statement in batches to avoid running out of undospace.

What is the most efficient and fast way to update from one table to another where the values are DIFFERENT.Eg: Table 1 has 4 NUMBER columns with a high precision eg : 0.2212454215454212 Table 2 has 6 columns.update table 2's four columns based on common column on both the tables, only the different ones. I'm trying to obfuscate the table's VARCHAR2 columns with random alphanumerics for every record on the table.My procedure executes successfully on smaller datasets, but it will eventually be used on a remote db whose settings I can't control, so I'd like to EXECUTE the UPDATE statement in batches to avoid running out of undospace.I have something like this DECLARE TYPE test1_t IS TABLE OF test.score%TYPE INDEX BY PLS_..; TYPE test2_t IS TABLE OF test.id%TYPE INDEX BY PLS..; TYPE test3_t IS TABLE OF test. In a quick test my desktop updated a similar table in 100 seconds and generated 272MB UNDO and 691MB REDO.