Updating rows using select into
When done, we swap the partition of original data with the 'dummy' table (the one containing new values), rebuild indexes in parallel, and wha-la! i.e, to update field2 in a table:1) First create your dummy hold table: create table xyz_HOLD as select * from xyz where rownum Hi Tom, As u suggested us to create a new table ,then drop the original table and rename the new table to original table instead of updating a table with millions of records.But what happen to dependent objects ,everything will get invalidated. We've a similar situation., We delete around 3 million records from 30 million rows table everyday.There are several common reason an UPDATE statement may fail.
Since this is an exclusive lock, not other transaction can modify data on this table, until the one which originally placed the lock is completed.Check out all our database development sessions at OOW19 Thanks for the question, Murali. I dont want to do in one stroke as I may end up in Rollback segment issue(s). This is absolutely a viable approach, and one we have used repeatedly.Asked: November 10, 2002 - pm UTC Answered by: Tom Kyte - Last updated: May 10, 2019 - am UTC Category: Developer - Version: 8.1.7 Viewed 100K times! One of our apps updates a table of several hundred million records. For loop approach for the update was calculated to take 53.7 years to complete!Recall the INNER JOIN clause is used to match the rows from one table to another using a join condition. The complete script to run to log the output into a temporary table is: This statement defines a table with three columns and names the table variable @Update Log.The reason we’re using a table variable is temporary and will be removed once query session is closed.