-support@yahoogroups.com
Subject: Re: [firebird-support] index use when using order by
On 2019-09-18 06:46, liviuslivius liviusliv...@poczta.onet.pl
[firebird-support] wrote:
> Hi
>
> your problem is that you have ascending index, which is not usable in
> descending queries. You ne
On 2019-09-18 06:46, liviuslivius liviusliv...@poczta.onet.pl
[firebird-support] wrote:
> Hi
>
> your problem is that you have ascending index, which is not usable in
> descending queries. You need to create descending index and it then
> can be used in e.g. max queries. Ascending index is used
On 2019-09-18 02:11, 'Andrew Zenz' and...@aimsoftware.com.au
[firebird-support] wrote:
> Firebird 2.5.7 (WI-2.5.7.27050)
>
> Just realised I 'should' be using 2.5.8, but on a server running
> WI-V2.5.8.27089 it still uses NATURAL.
Be aware, the latest version of Firebird 2.5 is 2.5.9, not
Subject: RE: [firebird-support] index use when using order by
Hi
your problem is that you have ascending index, which is not usable in
descending queries. You need to create descending index and it then can
be used in e.g. max queries. Ascending index is used in min queries and
order by xx asc
Hiyour problem is that you have ascending index, which is not usable in
descending queries. You need to create descending index and it then can be used
in e.g. max queries. Ascending index is used in min queries and order by xx
asc.Regards,Karol Bieniaszewski
null
reads, 0 writes.
0 inserts, 0 updates, 0 deletes, 4 index, 0 seq.
Delta memory: 20548 bytes.
Total execution time: 0.031s
Script execution finished.
Cheers,
Andrew Zenz
From: firebird-support@yahoogroups.com
[mailto:firebird-support@yahoogroup
I performed a trace and this is the result. I suspected it was doing an
order by:
Preparing Statement 5694738 : SELECT
"ID","USERNAME","USERNO","LOGDATE","LOGTIME","LOGTABLE","RECORDKEY","REC
ORDACTION","RECORDBEFORE","RECORDAFTER" FROM "AIMLOG" WHERE ("ID" <= ? )
ORDER BY "ID" DESC Time
