RE: [firebird-support] Bad performance with select first(1) + order by
Hello. Try using a "WHERE" clause if possible. Ex: WHERE "some_date_column_of_the_table" > (current_date - n) Atenciosamente, + + Hugo Eyng + + De: firebird-support@yahoogroups.com em nome de Matthias Winkler spmm...@gmail.com [firebird-support] Enviado: terça-feira, 4 de fevereiro de 2020 11:36 Para: firebird-support@yahoogroups.com Assunto: [firebird-support] Bad performance with select first(1) + order by Hello, I am struggling with my DB performance once more: SELECT FIRST(1) PRIMKEY FROM TABLE_X ORDER BY PRIMKEY DESC The statement is slow once more because of the sorting. I just want to find the entry with the highest primary key. The PRIMKEY is ASC and unique. Is the another way to achieve the same? Thanks Matthias
Re: [firebird-support] Bad performance with select first(1) + order by
I fixed the update statement with "UPDATE ... where PRIMKEY= GEN_ID(gen_primkey_counter,0)" and execution fell from 20s to 0,4. :-) Now a final question, what would GEN_ID(gen_primkey_counter,0) return, when I delete the last n entries of the table? It's fun to implement FB with such a great and instant support! Thanks! On Tue, Feb 4, 2020 at 1:12 PM Matthias Winkler wrote: > Hello SD, > > YES That kind of thing is what I was looking for, I guess. > Thanks > > On Tue, Feb 4, 2020 at 12:52 PM Dimitry Sibiryakov s...@ibphoenix.com > [firebird-support] wrote: > >> 04.02.2020 12:47, Matthias Winkler spmm...@gmail.com [firebird-support] >> wrote: >> > But I need to deal with a heap of old code and re-designing >> > it, is not a real option :-) >> >>Still you can use "update or insert ... matching gen_id(..., 0)" >> instead. >> >> >> -- >>WBR, SD. >> >> >> >> >> >> >> ++ >> >> Visit http://www.firebirdsql.org and click the Documentation item >> on the main (top) menu. Try FAQ and other links from the left-side menu >> there. >> >> Also search the knowledgebases at >> http://www.ibphoenix.com/resources/documents/ >> >> ++ >> >> >> Yahoo Groups Links >> >> >> >>
Re: [firebird-support] Bad performance with select first(1) + order by
Hello SD, YES That kind of thing is what I was looking for, I guess. Thanks On Tue, Feb 4, 2020 at 12:52 PM Dimitry Sibiryakov s...@ibphoenix.com [firebird-support] wrote: > 04.02.2020 12:47, Matthias Winkler spmm...@gmail.com [firebird-support] > wrote: > > But I need to deal with a heap of old code and re-designing > > it, is not a real option :-) > >Still you can use "update or insert ... matching gen_id(..., 0)" > instead. > > > -- >WBR, SD. > > > > > > > ++ > > Visit http://www.firebirdsql.org and click the Documentation item > on the main (top) menu. Try FAQ and other links from the left-side menu > there. > > Also search the knowledgebases at > http://www.ibphoenix.com/resources/documents/ > > ++ > > > Yahoo Groups Links > > > >
Re: [firebird-support] Bad performance with select first(1) + order by
04.02.2020 12:47, Matthias Winkler spmm...@gmail.com [firebird-support] wrote: > But I need to deal with a heap of old code and re-designing > it, is not a real option :-) Still you can use "update or insert ... matching gen_id(..., 0)" instead. -- WBR, SD. ++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
Re: [firebird-support] Bad performance with select first(1) + order by
Hi SD, no doubt, that might be solved better or more performant. But I need to deal with a heap of old code and re-designing it, is not a real option :-) On Tue, Feb 4, 2020 at 12:45 PM Dimitry Sibiryakov s...@ibphoenix.com [firebird-support] wrote: > 04.02.2020 12:42, Matthias Winkler spmm...@gmail.com [firebird-support] > wrote: > > The last entry is considered the "current" entry and should be updated > > when the programm encounters e.g. a error. > > (Then the field error_count of the "current" entry is then incremented) > >That's a bad design. The program should better only insert new records. > > > -- >WBR, SD. > > > > > > > ++ > > Visit http://www.firebirdsql.org and click the Documentation item > on the main (top) menu. Try FAQ and other links from the left-side menu > there. > > Also search the knowledgebases at > http://www.ibphoenix.com/resources/documents/ > > ++ > > > Yahoo Groups Links > > > >
Re: [firebird-support] Bad performance with select first(1) + order by
04.02.2020 12:42, Matthias Winkler spmm...@gmail.com [firebird-support] wrote: > The last entry is considered the "current" entry and should be updated > when the programm encounters e.g. a error. > (Then the field error_count of the "current" entry is then incremented) That's a bad design. The program should better only insert new records. -- WBR, SD. ++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
Re: [firebird-support] Bad performance with select first(1) + order by
The purpose of the code is: The last entry is considered the "current" entry and should be updated when the programm encounters e.g. a error. (Then the field error_count of the "current" entry is then incremented) On Tue, Feb 4, 2020 at 12:40 PM Svein Erling Tysvær setys...@gmail.com [firebird-support] wrote: > > > Just create a descending index, > Set > > tir. 4. feb. 2020 kl. 12:36 skrev Matthias Winkler spmm...@gmail.com > [firebird-support] : > >> >> >> Hello, >> >> I am struggling with my DB performance once more: >> >>SELECT FIRST(1) PRIMKEY >>FROM TABLE_X >>ORDER BY PRIMKEY DESC >> >> The statement is slow once more because of the sorting. >> I just want to find the entry with the highest primary key. >> The PRIMKEY is ASC and unique. >> >> Is the another way to achieve the same? >> >> Thanks >> >> Matthias >> >> >> >> >
Re: [firebird-support] Bad performance with select first(1) + order by
Just create a descending index, Set tir. 4. feb. 2020 kl. 12:36 skrev Matthias Winkler spmm...@gmail.com [firebird-support] : > > > Hello, > > I am struggling with my DB performance once more: > >SELECT FIRST(1) PRIMKEY >FROM TABLE_X >ORDER BY PRIMKEY DESC > > The statement is slow once more because of the sorting. > I just want to find the entry with the highest primary key. > The PRIMKEY is ASC and unique. > > Is the another way to achieve the same? > > Thanks > > Matthias > > > >
Re: [firebird-support] Bad performance with select first(1) + order by
04.02.2020 12:36, Matthias Winkler spmm...@gmail.com [firebird-support] wrote: > The PRIMKEY is ASC and unique. For this query it must be DESC. > Is the another way to achieve the same? What's the purpose of it? Unique id generation used to be handled by generators. -- WBR, SD. ++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
