How to extract the lines at a time?

I know that I can use rownum back n rows at a time, but the rownum function will apply after that all rows are returned by the query, which is bad for performance, because my table contains many rows. What I need, it's really get n lines both of the DB.

Concerning

I'm not sure what you mean by "the rownum function apply after that all rows are returned by the query", but this seems to be a wrong statement. If you have a limit of ROWNUM in a query, Oracle knows he has only fetch the first rows of M.

If looking for an ability to paginate the results of a query, there is a thread of AskTom on paging in SQL.

This would be appropriate, however, if you expect that users will never want the first pages of results (i.e. Google users do not have to browse all the pages of results for a generic search term, they're going to look at page 1, may be page 2 and page 3 and then stops). If the application must process all the rows that the query returns, you would need another building, and we would need some additional requirements. Your client application can probably fetch N rows at a time. If the customer is PL/SQL, a COLLECTION in BULK with a LIMIT clause may also be useful.

Justin

Tags: Database

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