As of PostGIS 3.0, the PostGIS raster support is no longer part of the postgis extension, but instead spun off into a new PostGIS extension called postgis_raster.

The two main reasons for this break were:

• Raster functionality in PostGIS is fat with over 150 functions and several types. Wading through these extra …

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As of PostGIS 2.3, the postgis extension was changed to no longer allow relocation. All function calls within the extension are now schema qualified.

While this change fixed some issues with database restore, it created the issue of if you installed PostGIS in a schema other than the one you wanted to it is not …

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The error 'postgis.backend' is already set comes up every so often in PostGIS mailing list. The issue arises often during or after an upgrade. I'll go over causes for this I am aware of and how to fix.

The question goes something like this

After upgrading to Postgis 2.3 from 2.1, my server log is filled with these …
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