On Wed, Sep 2, 2015 at 1:21 AM, Martin Davis <mtncl...@gmail.com> wrote:
> We've run some DB logging on the map requests.
>
> One of the causes of the slowdown for no schema is this query:
>
> SELECT NULL AS table_cat,
> o.owner AS table_schem,
> o.object_name AS table_name,
> o.object_type AS table_type,
> NULL AS remarks
> FROM all_objects o
> WHERE o.owner LIKE :1 ESCAPE '/'
> AND o.object_name LIKE :2 ESCAPE '/'
> AND o.object_type IN ('xxx', 'TABLE', 'VIEW', 'SYNONYM')
> ORDER BY table_type, table_schem, table_name
>
> If no owner is specified this returns 38K rows, as opposed to about 240
> when owner is given.
>
> I'm not totally sure what this is doing, but I suspect checking for
> Primary Key info?
>
> And why is this being run on each MapRequest ?
>
> Funnily, we have 2.6.3 running in a different setup, and it doesn't seem
> to be issuing any of these queries - just the data query. I can't see any
> config difference that would cause this.
>
Maybe not so funny, I remember of a major performance regression in JDBC
stores in 2.6.0,
indeed it was very slow against spatial databases, see the 2.6.1 release
notes:
http://blog.geoserver.org/2014/11/18/geoserver-2-6-1-released/
Discussion here:
http://osgeo-org.1560.x6.nabble.com/Severe-slowdown-in-ContentDataStore-in-12-x-and-trunk-td5167030.html
To avoid this kind of issue, besides more review, which never hurts but
requires more staff, we'd need
continuous performance testing and comparison against production sized
databases, something
I've been proposing on and off for several years, but that never got the
resourcing it needs to make it happen.
Cheers
Andrea
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