why this query needs more time? Its very slow

thx

//////////////////////////////////QUERY
select
coalesce(personaldetails.masterid::numeric,persona ldetails.id) +
(coalesce(personaldetails.id::numeric,0)/1000000) as sorting,
floor(coalesce(personaldetails.masterid::numeric,p ersonaldetails.id) +
(coalesce(personaldetails.id::numeric,0)/1000000)) as ppid,
personaldetails.id as pid,
personaldetails.masterid,
coalesce(personaldetails.prefix,'') || '' ||
coalesce(personaldetails.firstname,' ') || ' ' ||
coalesce(personaldetails.lastname,'''') as fullname,
personaldetails.regtypeid,
personaldetails.regdate,
personaldetails.regprice,
coalesce(regtypes.regtype,' ') || ' ' ||
coalesce(regtypes.subregtype,' ') as regtypetitle,
regtypes.regtype,
regtypes.subregtype,
regtypedates.title,
balance('MASTER-REGISTRATION',personaldetails.id) as balance,
coalesce(pd2.prefix,' ') || ' ' || coalesce(pd2.firstname,' ') ||
' ' || coalesce(pd2.lastname,' ') as accfullname,
coalesce(rt2.regtype,'''') || ' ' || coalesce(rt2.subregtype,' ') as
accregtypetitle,
pd2.id 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',pd2.id) as accbalance,
case when coalesce(balance('REGISTRATION',personaldetails.id ),0)<=0
then 1 else 0 end as balancestatus

from personaldetails
left outer join regtypes on regtypes.id=personaldetails.regtypeid
left outer join regtypedates on regtypes.dateid=regtypedates.id
left outer join personaldetails pd2 on personaldetails.id=pd2.masterid
left outer join regtypes rt2 on rt2.id=pd2.regtypeid
left outer join regtypedates rd2 on rt2.dateid=rd2.id
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
width=194)
Merge Cond: ("outer".regtypeid = "inner".id)
-> Sort (cost=42.36..42.37 rows=5
width=132)
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: regtypes.id
-> 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: rt2.id
-> Seq Scan on regtypes rt2 (cost=0.00..1.31 rows=31
width=66)
-> Hash (cost=1.04..1.04 rows=4 width=33)
-> Seq Scan on regtypedates rd2 (cost=0.00..1.04 rows=4 width=33)

ALÝ ÇELÝK wrote:
> why this query needs more time? Its very slow

Difficult to say for sure - could you provide the output of EXPLAIN
ANALYSE rather than just EXPLAIN?

Some other immediate observations:
1. Perhaps don't post to so many mailing lists at once. If you reply to
this, maybe reduce it to pgsql-performance?
2. You don't say whether the row estimates are accurate in the EXPLAIN.
3. You seem to be needlessly coalescing personaldetails.masterid since
you check for it being null in your WHERE clause
4. Do you really need to cast to numeric and generate a "sorting" column
that you then don't ORDER BY?
5. Is ppid an id number? And are you sure it's safe to calculate it like
that?
6. What is balance() and how long does it take to calculate its result?

> select
> coalesce(personaldetails.masterid::numeric,persona ldetails.id) +
> (coalesce(personaldetails.id::numeric,0)/1000000) as sorting,
> floor(coalesce(personaldetails.masterid::numeric,p ersonaldetails.id) +
> (coalesce(personaldetails.id::numeric,0)/1000000)) as ppid,

> balance('MASTER-REGISTRATION',personaldetails.id) as balance,

> balance('MASTER-REGISTRATION',pd2.id) as accbalance,

I'm guessing point 6 is actually your problem - try it without the calls
to balance() and see what that does to your timings.
--
Richard Huxton
Archonet Ltd

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