@Mark: I see the very same issue with firebird 3.0.4. Any ideas?
On Fri, Jan 24, 2020 at 1:46 PM Mark Rotteveel m...@lawinegevaar.nl [firebird-support] <firebird-support@yahoogroups.com> wrote: > > > On 2020-01-24 13:29, Matthias Winkler spmm...@gmail.com > [firebird-support] wrote: > > Hello, > > > > With Firebird 2.1.7 this statement freezes my firebird server > > completely. Firebird will > > take 100% CPU. > > > >> select first(8) ID from TBL_TEST > >> where ID not in (select first(2) ID from TBL_TEST order by ID desc) > >> order by ID desc > > > > The used table has about 18`000 entries. > > > > If I remove ONE of the order statements the query runs fine and takes > > around 3s. > > > > Can somebody explain what execution plan is made for this statement > > and > > why it might sent my server into 100% CPU? > > > > Note: The statement here is simplified from my real usecase. The > > statement itself might > > not look useful. But that is not the point. > > Firebird 2.1 has been end-of-life for more than five years. Can you > reproduce this with Firebird 3.0? > > Mark > >
