I'm having some serious performance issues with a query that joins two tables across a database link in Oracle. When I run the query via SQLPLUS, or I run it in the form $dbhandle->selectall_arrayref($statement), it returns in milliseconds. But when I prepare the statement and bind parameters to it, the $sth->execute() or $sth->execute(@parameters) takes more than 25 seconds to return. The number of rows produced by the join is trivial, although (admittedly) the number of rows in the joined table is large. Any suggestions? 
my $statement = 'select a.foo, b.bar from local a,
 remote@my_database_link b where a.baz = b.baz (+) 
 and a.parm1 = 1 and b.parm2 = 2';
my $ary_ref = $dbhandle->selectall_arrayref($statement); # this execut
+es in less than a second

$statement = 'select a.foo, b.bar from local a, 
 remote@my_database_link b where a.baz = b.baz (+) 
 and a.parm1 = ? and b.parm2 = ?';
my $sth = $dbhandle->prepare($statement);
my $rv = $sth->execute(1,2); # this takes 25+ seconds to execute
$ary_ref = $sth->fetchall_arrayref(); # this takes milliseconds

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In reply to DBI & DBD::Oracle -- Executing a statement handle across a database link by Anonymous Monk

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