Best Of The Best Tips About How To Avoid Full Table Scan In Oracle

I have index for the x column and other required columns.

How to avoid full table scan in oracle. As you see the query without the hint does a full table scan while the hinted query uses the index. What is the best way for me to avoid the full table scan here. Table scans on large tables take an excessive amount of time.

Is it possible to avoide full table scan at all. If you would add a. Where ims.oid_nbr = imps.im_status_oid_nbr (+) group by.

So nothing say you that the current used explain plan will be use. Full table scan is required because null can not be. Ensure that indexes exist on the key value and that the index has.

The explain plan can change with the new stats, which change whenever they are gathered on the new data. Else 0 end) as manifest_ack_not_required. I have also seen that even

Use analyze table tbl_name to update the key distributions for the scanned. A table scan is the reading of every row in a table and is caused by queries that don’t properly use indexes. For large tables, try the following techniques to avoid having the optimizer incorrectly choose a table scan: