$ ls -l file* ls: file*: No such file or directory $ ./test.pl > /dev/null $ ls -l file* -rw-r--r-- 1 19456 Jul 24 22:46 file:memdb2?mode=memory&cache=shared $ ./test3.pl > /dev/null $ ls -l file* -rw-r--r-- 1 36864 Jul 24 22:46 file:memdb2?mode=memory&cache=shared #### CONNECT=> 'dbi:SQLite:dbname=file:memory:?mode=memory&cache=shared' 19456 Jul 24 23:15 file:memory:?mode=memory&cache=shared CONNECT=> 'dbi:SQLite:dbname=:memory:?cache=shared' 19456 Jul 24 23:18 :memory:?cache=shared CONNECT=> 'dbi:SQLite:dbname=:memory:\?cache=shared' 19456 Jul 24 23:19 :memory:\?cache=shared CONNECT=> 'dbi:SQLite:dbname=:memory:cache=shared' 19456 Jul 24 23:20 :memory:cache=shared CONNECT=> 'dbi:SQLite:dbname=:memory?cache=shared:' 19456 Jul 24 23:21 :memory?cache=shared: