#!/bin/sh

#  tweak maintenance_work_mem as appropriate

  for power in 3 4 5 6 7;   # 6: 1M   7: 10M
# for power in 8 ;   # 6: 1M   7: 10M
do
  table=azjunk${power}
  index=${table}_trgm_re_idx
  echo "-- generating table $table with index $index";
  time perl -E'
  sub ss{ join"",@_[ map{rand @_} 1 .. shift ] };
  say(ss(80,"a".."g"," ","h".."m"," ","n".."s"," ","t".."z"))
     for 1 .. 1e'"${power};" \
  | psql -aqXc "
    drop table if exists $table;
    create table $table(txt text); copy $table from stdin;
    set session maintenance_work_mem='1500MB';
    create index $index on $table using gin (txt gin_trgm_ops);
    analyze $table;" ;
  echo "select current_setting('server_version') as version,'$table' as table
  ,pg_size_pretty(pg_relation_size('public.$table')) as data
  ,pg_size_pretty(pg_relation_size('public.$index')) as idx
  ,(select reltuples+0 from pg_class where relname='$table')as rowcount;"|psql;
done