Postgresql – Does PgBouncer create a separate pool for every database config entry

Maybe it would be easiest to run a psql in the background, with it set to execute stdin, and connect its stdin to a named pipe. Then you can continually push data into that pipe, and finally push "end; \quit". Something like:

#!/bin/sh

psql_pipe=/tmp/psql$$
mkfifo -m 600 $psql_pipe
psql < $psql_pipe &
exec 3>$psql_pipe
psql_pid=$!

echo "> Started psql (pid=$psql_pid) reading from $psql_pipe"
trap '
  kill $psql_pid
  rm -f $psql_pipe
' EXIT

echo "begin;" >&3

echo "select now();" >&3

sleep 2

echo "select now();" >&3

sleep 2

echo "end; \quit" >&3

wait $psql_pid

Note that you can't simply do echo "sql" >$psql_pipe since the EOF would be transmitted to psql, which would then exit early-- the shell script has to keep its fd open.

I am not a database designer.

You don't make dbs but tables.

Both of your table structures can be implemented as innodb tables and as MyIsam tables.

Your first idea is not a good design. It violates first normal form, so i would propose the second idea with innodb. the table db1 can be decomposed further in two tables

id | name      | details      | add_date   | brand
1  | some name | some details | 1333128354 | 1
2  | some name | some details | 1333128355 | 1
3  | some name | some details | 1333128357 | 2

id | brand
1  | nike
2  | puma