Re: order by primary key slowly
> It is obvious that the second option takes longer than the first query
> since it needs to read more than 5 times as many index entries ...
What confuses us users is that Explain suggests the opposite: it will read 5,465,723 rows for the quicker query, 1,000,010 for the slower one. Explain fails to explain that the PK index is slower to read.
> and in addition sort all the IDs.
Yes.
Subject
Views
Written By
Posted
3208
April 05, 2016 10:42PM
1443
April 06, 2016 04:35AM
1371
April 06, 2016 10:15AM
1386
April 06, 2016 11:23AM
1505
April 06, 2016 08:11PM
1419
April 06, 2016 10:35PM
1396
April 07, 2016 12:34AM
4072
April 07, 2016 07:21AM
Re: order by primary key slowly
1481
April 07, 2016 10:20AM
1369
April 07, 2016 11:26PM
1488
April 12, 2016 07:42PM
1327
April 06, 2016 08:57AM
1353
April 06, 2016 10:17AM
Sorry, you can't reply to this topic. It has been closed.
Content reproduced on this site is the property of the respective copyright holders.
It is not reviewed in advance by Oracle and does not necessarily represent the opinion
of Oracle or any other party.