Query Optimis

From: <cosltemp-g.manoj_at_orbitech.co.in>
Date: Wed, 26 Jun 2002 03:34:36 -0800
Message-ID: <F001.004883D2.20020626033436@fatcity.com>

Hi,

     I have a cursor which is taking some time to execute (when i/p para is null)
How can the cursor qry be optimised.
Only either of 2 subqry execute depend on input parameter (null or not null ) currently hardcoded as null
the o/p qry gives about 70K rows.

Note : Unique index on b.insert_sequence is present,

     primary key on ( fin_rec_id,fin_rec_serial_no,inst_dt) is present in table aliased b

     primary key on ( fin_rec_id,fin_rec_serial_no) is present in table aliased a

     there is only one row in map_timestamp for specified mapping_name,schema_name

cursor pop_ln_dtls(inp_insrt_seq varchar2 := NULL) is select a.fin_rec_id,a.fin_rec_serial_no,a.cosmos_base_no, a.br_cod,a.tran_ref_no,inst_dt,
prin_amt,b.insert_sequence
from obs_fin_rec a,obs_fin_schd b
where a.fin_rec_id = b.fin_rec_id
and a.fin_rec_serial_no = b.fin_rec_serial_no and (((ip_ln_ref_no is null) and
(

 b.insert_sequence >
(

  select nvl(last_sequence,0)
  from map_timestamp
  where mapping_name = c_mapping_name
  and schema_name = c_schema_name
))) or
(

 (ip_ln_ref_no is not null) and
 (tran_ref_no = ip_ln_ref_no) and
 (b.insert_sequence like inp_insrt_seq||'%' )

))
order by b.insert_sequence;

Thanks
Manoj.

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Received on Wed Jun 26 2002 - 06:34:36 CDT