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more execution time

From: "AL ELK" <ali(at)verus(dot)com(dot)tr>
To: pgsql-benchmarks(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org,pgsql-performance(at)postgresql(dot)org, pgsql-sql(at)postgresql(dot)org
Subject: more execution time
Date: 2005-03-11 11:54:56
Message-ID: d0s0uj$17l$ (view raw or whole thread)
Lists: pgsql-benchmarkspgsql-generalpgsql-performancepgsql-sql
why this query needs more time?  Its very slow


      coalesce(personaldetails.masterid::numeric, +
(coalesce(,0)/1000000) as sorting,
      floor(coalesce(personaldetails.masterid::numeric, +
(coalesce(,0)/1000000)) as ppid, as pid,
      coalesce(personaldetails.prefix,'') || '' ||
coalesce(personaldetails.firstname,' ') || ' ' ||
coalesce(personaldetails.lastname,'''') as fullname,
      coalesce(regtypes.regtype,' ') || ' ' ||
coalesce(regtypes.subregtype,' ') as regtypetitle,
      balance('MASTER-REGISTRATION', as balance,
           coalesce(pd2.prefix,' ') || ' ' || coalesce(pd2.firstname,' ') ||
' ' || coalesce(pd2.lastname,' ') as accfullname,
      coalesce(rt2.regtype,'''') || ' ' || coalesce(rt2.subregtype,' ') as
accregtypetitle, as accid,
      pd2.regtypeid as accregtypeid,
      pd2.regdate as accregdate,
      pd2.regprice as accregprice,
      rt2.regtype as accregtype,
      rt2.subregtype as accsubregtype,
      rd2.title as acctitle,
      balance('MASTER-REGISTRATION', as accbalance,
      case when coalesce(balance('REGISTRATION',,0)<=0
then 1 else 0 end as balancestatus

from personaldetails
left outer join regtypes on
left outer join regtypedates on
left outer join personaldetails pd2 on
left outer join regtypes rt2 on
left outer join regtypedates rd2 on
where personaldetails.masterid is null
///////////////////////////////////////////////////// RESULT STATISTICS
Total query runtime: 348892 ms.
Data retrieval runtime: 311 ms.
763 rows retrieved.
////////////////////////////////////////////////////  EXPLAIN QUERY

Hash Left Join  (cost=109.32..109.95 rows=5 width=434)
  Hash Cond: ("outer".dateid = "inner".id)
  ->  Merge Left Join  (cost=108.27..108.46 rows=5 width=409)
        Merge Cond: ("outer".regtypeid = "inner".id)
        ->  Sort  (cost=106.19..106.20 rows=5 width=347)
              Sort Key: pd2.regtypeid
              ->  Hash Left Join  (cost=90.11..106.13 rows=5 width=347)
                    Hash Cond: ("outer".id = "inner".masterid)
                    ->  Hash Left Join  (cost=45.49..45.71 rows=5 width=219)
                          Hash Cond: ("outer".dateid = "inner".id)
                          ->  Merge Left Join  (cost=44.44..44.63 rows=5
                                Merge Cond: ("outer".regtypeid = "inner".id)
                                ->  Sort  (cost=42.36..42.37 rows=5
                                      Sort Key: personaldetails.regtypeid
                                      ->  Seq Scan on personaldetails
(cost=0.00..42.30 rows=5 width=132)
                                            Filter: (masterid IS NULL)
                                ->  Sort  (cost=2.08..2.16 rows=31 width=66)
                                      Sort Key:
                                      ->  Seq Scan on regtypes
(cost=0.00..1.31 rows=31 width=66)
                          ->  Hash  (cost=1.04..1.04 rows=4 width=33)
                                ->  Seq Scan on regtypedates
(cost=0.00..1.04 rows=4 width=33)
                    ->  Hash  (cost=42.30..42.30 rows=930 width=132)
                          ->  Seq Scan on personaldetails pd2
(cost=0.00..42.30 rows=930 width=132)
        ->  Sort  (cost=2.08..2.16 rows=31 width=66)
              Sort Key:
              ->  Seq Scan on regtypes rt2  (cost=0.00..1.31 rows=31
  ->  Hash  (cost=1.04..1.04 rows=4 width=33)
        ->  Seq Scan on regtypedates rd2  (cost=0.00..1.04 rows=4 width=33)


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