[postgis-users] ST_Union() about 1179 raster-tiles cause ProgreSQL crashes

[Jackie]

Hi PostGIS users,
I have a PostGIS database, which stores raster from Landsat 8. Each 
scene was divided with tile-size 500x500. Then each row in database will 
keep 1 tile with 11 bands (except band No. 8).
I'm trying to ST_Union() about 1179 raster-tiles with 3 bands (2,3,4) 
and pgAdminIII shows a window said "Connection lost - Try to reconnect 
database";
Here's my query:
SELECT ST_Union(rast, 
ARRAY[ROW(2,'LAST'),ROW(3,'LAST'),ROW(4,'LAST')]::unionarg[])
FROM landsat8
WHERE ST_Overlaps(polygon, rast_geom_4326)

I'm using PostGIS 2.1, my raster is retrieved from 
earthexplorer.usgs.gov <http://earthexplorer.usgs.gov/>
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