On Fri, Mar 01, 2013 at 11:36:35AM -0500, Jerry Carter wrote:
> Minor question on the upgrade process and PostgreSQL extensions.  
> 
> When I built from source and upon the completion of 'make install', 
> PostgreSQL reported [1] that version 2.0.3 was present BEFORE issuing the 
> ALTER EXTENSION commands as advised in section 2.9.1.2 of the documentation.  
> Are the 'ALTER EXTENSION' commands really necessary?  If not, perhaps the 
> documentation might suggest checking the version first.  If so, a warning in 
> the documentation that the reported version doesn't match the installed 
> version seems appropriate.
...
> [1] SELECT "name",default_version,installed_version FROM 
> pg_available_extensions WHERE "name" ILIKE 'postgis%'

The _presence_ of an extension (what you're querying) doesn't mean
that extension is in use.

Use postgis_full_version() to know which version you're using.

--strk;
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