[postgis-users] Postgis 2.1.0 poor performance vs Postgis 2.0.3

[Stephen Woodbridge]

Paul,

Cool! And yes, anytime you load a database or table like from shp2pgsql 
you should analyze it to update the database statistics other wise the 
planner has no information about what indexes to use. This might be a 
good practice after adding a new index or making lots of changes to an 
existing index doing updates/deletes/inserts on a table.

-Steve

On 12/10/2013 12:00 PM, Moen, Paul T. wrote:
> Steve,
>
> That did the trick in a big way.  I will make ANALYZE a step in my upgrade
> process from now on.
>
> My new query after the ANALYZE.
>
> --select
> "flow_type","feat_type",encode(ST_AsBinary(ST_Force2D("the_geom"),'NDR'),'h
> ex') as geom,"gid" from basemap.water24k_line where the_geom &&
> ST_GeomFromText('POLYGON((1564746.75408708
> 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605
> 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708
> 903581.471987315))',2266);
> Total query runtime: 569 ms.
> 344 rows retrieved.
>
>
> Thank you very much,
>
> Paul
>
> On 12/10/13, 10:02 AM, "Stephen Woodbridge" <woodbri at swoodbridge.com>
> wrote:
>
>> Paul,
>>
>> Did you ANALYZE the new database after you upgraded it to 2.1.0?
>> Try that and rerun your query and see if that helps.
>>
>> -Steve
>>
>> On 12/10/2013 10:46 AM, Moen, Paul T. wrote:
>>> I have a table of multilines that the query below slows down
>>> considerably after upgrading to postgis 2.1.0.
>>>
>>> I am running the following Postgis.
>>> "POSTGIS="2.0.3 r11128" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0,
>>> 6 March 2012" GDAL="GDAL 1.10.1, released 2013/08/26" LIBXML="2.7.3"
>>> LIBJSON="UNKNOWN" TOPOLOGY RASTER"
>>> Below is a query that is created by Mapserver 6.0.3 that I am running in
>>> pgAdmin.
>>> -- Executing query:
>>> select
>>>
>>> "flow_type","feat_type",encode(ST_AsBinary(ST_Force_2D("the_geom"),'NDR')
>>> ,'hex')
>>> as geom,"gid" from basemap.water24k_line where the_geom &&
>>> ST_GeomFromText('POLYGON((1564746.75408708
>>> 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605
>>> 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708
>>> 903581.471987315))',2266)
>>> Total query runtime: 569 ms.
>>> 344 rows retrieved.
>>>
>>> After upgrading to Postgis 2.1.0,
>>> "POSTGIS="2.1.0 r11822" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0,
>>> 6 March 2012" GDAL="GDAL 1.10.1, released 2013/08/26" LIBXML="2.7.3"
>>> LIBJSON="UNKNOWN" TOPOLOGY RASTER"
>>> the same query takes over 10 times the time.
>>>
>>> -- Executing query:
>>> select
>>>
>>> "flow_type","feat_type",encode(ST_AsBinary(ST_Force_2D("the_geom"),'NDR')
>>> ,'hex')
>>> as geom,"gid" from basemap.water24k_line where the_geom &&
>>> ST_GeomFromText('POLYGON((1564746.75408708
>>> 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605
>>> 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708
>>> 903581.471987315))',2266);
>>> --select postgis_full_version();
>>> --alter extension postgis_topology update to '2.1.0';
>>> WARNING:  ST_Force_2d signature was deprecated in 2.1.0. Please use
>>> ST_Force2D
>>> CONTEXT:  SQL function "st_force_2d" during startup
>>> Total query runtime: 6202 ms.
>>> 344 rows retrieved.
>>>
>>> Changing ST_Force_2D to ST_Force2D helped quite a bit, but it is still
>>> twice as slow as Postgis 2.0.3.
>>>
>>> -- Executing query:
>>> select
>>>
>>> "flow_type","feat_type",encode(ST_AsBinary(ST_Force2D("the_geom"),'NDR'),
>>> 'hex')
>>> as geom,"gid" from basemap.water24k_line where the_geom &&
>>> ST_GeomFromText('POLYGON((1564746.75408708
>>> 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605
>>> 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708
>>> 903581.471987315))',2266);
>>> --select postgis_full_version();
>>> --alter extension postgis_topology update to '2.1.0';
>>> Total query runtime: 1029 ms.
>>> 344 rows retrieved.
>>>
>>> Is performance hit expected?
>>>
>>> Thanks for any insight,
>>>
>>>
>>> Paul
>>>
>>>
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>>> postgis-users mailing list
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>>>
>>
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