Large Set of Rows - Performance

Question

Hello all.
We do have a report (Apex 3.2), where if no filter is defined, loads about 60.000 lines. Running the same query on sqlplus or Sql Developer, the performance is acceptable, but on Apex, it takes several minutes, causing some users to abort (close the browser and try again, and aborting again). This behaviour is causing extreme CPU and disk workload. Temp tablespace sometimes gets 100% full to (2GB!!!).
It is not an option to tell them to make some selection before submiting the page for 2 reasons: sometimes they forget it and sometimes they just do not want to do it, because they argue that "on Oracle Forms it was really quick".
Are there any suggestions to this situation? It is causing some requests to go back to Oracle Forms 6i...
Thanks in advance.

Answer 1

Query is :
select a.SUP_CHAMADO_ID,
a.SUP_CLIENTE,
a.CONTATO,
a.DDD_TELEFONE,
a.SUP_TECNICO,
a.NOME_TECNICO,
a.SUP_SISTEMA,
a.ABERTURA,
a.SUP_SITUACAO,
a.SITUACAO,
a.NOME_CLIENTE,
a.NOME_SISTEMA,
a.SUP_CLIENTE_ID,
a.Tolerancia_Atendimento,
SubStr(a.Diagnostico, 1, 60) Diagnostico,
SubStr(a.Solucao, 1, 60) Solucao,
case when Tolerancia_Atendimento < 0 then 'red'
when Tolerancia_Atendimento >= 0 then 'black'
end the_color,
case when Tolerancia_Atendimento < 0 then 'bold'
when Tolerancia_Atendimento >= 0 then 'plain'
end the_style
From SUP_CHAMADOS_VW a
WHERE
instr(upper(To_Char(a.SUP_CHAMADO_ID)),upper(nvl(:P2_SEARCH_REPORT, To_Char(a.Sup_Chamado_Id)))) > 0 Or
instr(upper(a.CONTATO),upper(nvl(:P2_SEARCH_REPORT, a.CONTATO))) > 0 Or
instr(upper(a.DDD_TELEFONE),upper(nvl(:P2_SEARCH_REPORT, a.DDD_TELEFONE))) > 0 Or instr(upper(a.FINALIDADE),upper(nvl(:P2_SEARCH_REPORT, a.FINALIDADE))) > 0
Or instr(upper(SubStr(a.DIAGNOSTICO, 1, 4000)),upper(nvl(:P2_SEARCH_REPORT, SubStr(a.DIAGNOSTICO, 1, 4000)))) > 0
Or instr(upper(SubStr(a.DIAGNOSTICO, 1, 4000)),upper(nvl(:P2_SEARCH_REPORT, SubStr(a.DIAGNOSTICO, 1, 4000)))) > 0) And
a.SUP_CLIENTE = DECODE(Nvl(:P2_SUP_CLIENTES, 'ALL'), 'ALL', a.SUP_CLIENTE, :P2_SUP_CLIENTES) And
Nvl(a.SUP_SISTEMA, 'ALL') = DECODE(Nvl(:P2_SUP_SISTEMAS, 'ALL'), 'ALL', Nvl(a.SUP_SISTEMA, 'ALL'), Nvl(:P2_SUP_SISTEMAS, 'ALL')) And
To_Char(a.SUP_SITUACAO) = DECODE(Nvl(To_Char(:P2_SUP_SITUACOES), '0'), '0', To_Char(a.SUP_SITUACAO), To_Char(:P2_SUP_SITUACOES)) And
Nvl(a.SUP_TECNICO, 'ALL') = DECODE(Nvl(:P2_SUP_TECNICOS, 'ALL'), 'ALL', Nvl(a.SUP_TECNICO, 'ALL'), Nvl(:P2_SUP_TECNICOS, 'ALL')) And
a.SUP_DATA >= DECODE(:P2_PERIODO, 'A', TRUNC(SYSDATE) - 10,
'B', TRUNC(SYSDATE) - 30,
'C', TRUNC(SYSDATE) - 180,
'D', TO_DATE('01/01/1900', 'DD/MM/YYYY'))
The main problem is: it does not start to show the results quickly as does in Forms 6i.
Pagination now is set at Row Ranges 1-15 16-30 in select list (with pagination).
Thanks