I have a really big table containing over 100kk rows and I would like to update about 3kk rows.
Following count returns 3kk and takes about 300s to execute
select count(*) from A where x=.. and y=..
But the update statement is much slower…
update A set z = .. where x=.. and y=..
V$ SESSION_LONGOPS says it might take ~10-15h to finish.
What are the steps I can take to improve the performance of the above update? CTAS probably doesn’t make much sense in this case (3kk rows in 100kk rows table).
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