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$ ls -lh GbAccList.0206.2011
-rw-rw-r-- 1 aardvark aardvark 4.6G Feb  8 17:21 GbAccList.0206.2011
...
  analyze t;" | psql -q

real    5m50.291s

# 5 'random' searches like: 
echo "explain analyze
  select * from t
  where i2 = $gi;" | psql

   Index Cond: (i2 = 2017697)   Total runtime: 0.157 ms
   Index Cond: (i2 = 6895719)   Total runtime: 0.109 ms
   Index Cond: (i2 = 3193323)   Total runtime: 0.119 ms
   Index Cond: (i2 = 8319666)   Total runtime: 0.091 ms
   Index Cond: (i2 = 1573171)   Total runtime: 0.119 ms