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Accept all cookies Customize settings. You can refer to the video tutorial on my YouTube channel for the detailed explanation of the above code. So this time instead of fetching all the records and exhausting an expensive resource like memory, thanks to the LIMIT clause, we are retrieving only the necessary rows and that too without any resource wastage. This way we can take our query performance a notch higher with bulk collect.
He has answered this question really well. Rather, it will truncate the table and populate the nested table again from the index no. Go ahead and checkout his article. Hope you enjoyed reading, if so then do make sure to share this tutorial with your friends on your social media. This clearly demonstrates the implicit array processing being done by Oracle 10g. The next section shows alternative methods of limiting the data returned by bulk collections.
Although large operations can be processed in chunks, sometimes only a subset of the total number of rows needs to be processed. To process a subset, four possible methods are available:. The following section shows how bulk collections can be used in conjunction with the returning clause of DML statements.
Feel free to ask questions on our Oracle forum. Active 1 year, 7 months ago. Viewed 22k times. OldProgrammer Thej Thej 2 2 gold badges 5 5 silver badges 17 17 bronze badges. Why do you think you need to do a commit every 5K? Also see here asktom. If any exceptions comes, then I don't need to proceed with the records already updated — Thej.
And how do you know that a record was updated? Please read the links I posted, on why frequent commits are a bad practice. And if you are on 10g and later i would use Merge in place of update which should help for performance because it will do a join between 2 tables and won't execute the subquery a million times test it don't take my word for it as usual results may vary :. Add a comment.
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