Re: pgsql-performance issue

2016-08-20 14:17 GMT+02:00 <debasis(dot)moharana(at)ipathsolutions(dot)co(dot)in>:

> On 2016-08-20 12:05, Pavel Stehule wrote:
>
>> 2016-08-20 13:59 GMT+02:00 <debasis(dot)moharana(at)ipathsolutions(dot)co(dot)in>:
>>
>> On 2016-08-20 11:42, Pavel Stehule wrote:
>>>
>>> 2016-08-20 13:31 GMT+02:00 <debasis(dot)moharana(at)ipathsolutions(dot)co(dot)in>:
>>>
>>> On 2016-08-20 08:58, Pavel Stehule wrote:
>>> 2016-08-20 10:27 GMT+02:00 <debasis(dot)moharana(at)ipathsolutions(dot)co(dot)in>:
>>>
>>> On 2016-08-20 08:21, pgsql-performance-owner(at)postgresql(dot)org wrote:
>>>
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>> .org/debasis.moharana%40ipathsolutions.co.in
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>>> [1]
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>>> [1]>
>>> Dear Sir/Mam,
>>>
>>> I have a PostgreSQL 9.5 instance running on Windows 8 machine with
>>> 4GB of RAM.This server is mainly used for inserting/updating large
>>> amounts of data via copy/insert/update commands, and seldom for
>>> running select queries.
>>>
>>> Here are the relevant configuration parameters I changed:
>>>
>>> max_connections = 100
>>> shared_buffers = 512MB
>>> effective_cache_size = 3GB
>>> work_mem = 12233kB
>>> maintenance_work_mem = 256MB
>>> min_wal_size = 1GB max_wal_size = 2GB
>>> checkpoint_completion_target = 0.7
>>> wal_buffers = 16MB
>>> default_statistics_target = 100
>>>
>>> After setting in postgresql.conf. I run the select query to fetch
>>> large amount of record of 29000 in postgresql but it takes 10.3
>>> seconds but the same query takes 2 seconds for execution in MSSQL.
>>>
>>> So my query is how to improve the perfermance in postgresql.
>>>
>>
>> hi
>>
>> please, send execution plan of slow query
>>
>> https://www.postgresql.org/docs/current/static/sql-explain.html [3]
>> [3]
>> [3]
>> https://explain.depesz.com/ [4] [4] [4]
>>
>> p.s. Did you do VACUUM and ANALYZE on database?
>>
>> Regards
>>
>> Pavel
>>
>> Regards,
>>> Debasis Moharana
>>> .NET Software Developer
>>>
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>>
>> Links:
>> ------
>> [1]
>>
>>
>> https://lists.postgresql.org/mj/mj_wwwusr/domain=postgresql.
>> org/debasis.moharana%40ipathsolutions.co.in
>> [1]
>> [2]
>> [2] http://www.postgresql.org/mailpref/pgsql-performance [2] [1]
>> [3] https://www.postgresql.org/docs/current/static/sql-explain.html
>> [3]
>> [3]
>> [4] https://explain.depesz.com/ [4] [4]
>>
>>
>> Hi,
>>
>> Please check the execution plan details
>>
>> Execution Query is = EXPLAIN (ANALYZE, BUFFERS) select * from
>> tblPurchaseOrderstock cross join tblPurchaseOrderInfo;
>>
>> "Nested Loop (cost=0.00..507.51 rows=39593 width=224) (actual
>> time=0.032..13.026 rows=39593 loops=1)"
>> " Buffers: shared read=8"
>> " I/O Timings: read=0.058"
>> " -> Seq Scan on tblpurchaseorderstock (cost=0.00..7.89 rows=289
>> width=95) (actual time=0.014..0.082 rows=289 loops=1)"
>> " Buffers: shared read=5"
>> " I/O Timings: read=0.040"
>> " -> Materialize (cost=0.00..5.05 rows=137 width=129) (actual
>> time=0.000..0.006 rows=137 loops=289)"
>> " Buffers: shared read=3"
>> " I/O Timings: read=0.019"
>> " -> Seq Scan on tblpurchaseorderinfo (cost=0.00..4.37
>> rows=137 width=129) (actual time=0.011..0.035 rows=137 loops=1)"
>> " Buffers: shared read=3"
>> " I/O Timings: read=0.019"
>> "Planning time: 56.052 ms"
>> "Execution time: 14.038 ms"
>>
>> It is same query? It needs only 14ms
>>
>> Regards
>>
>> Pavel
>>
>> Regards,
>>> Debasis Moharana
>>>
>>
>> Links:
>> ------
>> [1] http://www.postgresql.org/mailpref/pgsql-performance [2]
>> [2]
>>
>> https://lists.postgresql.org/mj/mj_wwwusr/domain=postgresql.
>> org/debasis.moharana%40ipathsolutions.co.in
>> [1]
>> [3] https://www.postgresql.org/docs/current/static/sql-explain.html
>> [3]
>> [4] https://explain.depesz.com/ [4]
>>
>> Hi,
>>
>> Yes you right.But it will take more time(10.3 sec.) Plase check the
>> snap.
>>
>> The real time you can see in EXPLAIN ANALYZE ... output. The some
>> strange time what you can see in PgAdmin can be based on
>>
>> a) PgAdmin issue - pgAdmin is relativly slow client due slow
>> formatting - the time of processing in your application can be pretty
>> better, try to check another client
>>
>> b) there can be some network issues - the problem is in passing data
>> from server to client
>>
>> but probably variant is @a - pgAdmin is not good for benchmarking -
>> use "psql" console instead.
>>
>> Pavel
>>
>> Can you please tell me what we need to setup so that it will take
>>> the actual time.
>>>
>>> Regards,
>>> Debasis Moharana
>>>
>>
>>
>>
>> Links:
>> ------
>> [1]
>> https://lists.postgresql.org/mj/mj_wwwusr/domain=postgresql.
>> org/debasis.moharana%40ipathsolutions.co.in
>> [2] http://www.postgresql.org/mailpref/pgsql-performance
>> [3] https://www.postgresql.org/docs/current/static/sql-explain.html
>> [4] https://explain.depesz.com/
>>
>
>
> Hi,
>
> Actually i am fresher on this.So want to connect my application with
> postgresql instead of MSSQL.
>
> If we are using psql console for executing the query then it will faster
> according to you.
> But what is the other option to use instead of pgadmin.
>
> Can you give me some link for reference.
>

https://wiki.postgresql.org/wiki/Community_Guide_to_PostgreSQL_GUI_Tools
http://www.sqlmanager.net/en/products/postgresql/manager

Regards

Pavel

> Regards,
> Debasis Moharana
>