I had similar problem before, and then I figured it out. Look at this thread:
http://osgeo-org.1560.x6.nabble.com/How-to-use-PostGIS-spatial-index-in-3-0-0-Urgent-td5208696.html
Best,
Cody
-----
Geospatial discovery and cyberinfrastructure
--
View this message in context: http://osgeo-org.1560.x6.nabble.com/Geonetwork3-with-postgreSQL-pb-tp5209697p5209821.html
Sent from the GeoNetwork users mailing list archive at Nabble.com.