.install file not working, please help since it is urgent

Hello all, I am writing the following code in my .install file. its purpose is to create a table in database, which will be used later, but when i install the module, i am not seeing any table in the database. Kindly have a look at the following code and let me know if i am making any mistake.

function split_test_schema() {
$schema = array();
$schema['split_test'] = array(
'fields' => array(
'stid'=>array('type'=>'serial','unsigned'=>true),
'page1'=>array('type'=>'varchar','length'=>200),
'page1_hits'=>array('type'=>'int','length'=>10,'default'=>0),
'page1_conv'=>array('type'=>'int','length'=>10,'default'=>0),
'page2'=>array('type'=>'varchar','length'=>200),
'page2_hits'=>array('type'=>'int','length'=>10,'default'=>0),
'page2_conv'=>array('type'=>'int','length'=>10,'default'=>0),
'action'=>array('type'=>'varchar','length'=>200),
'hit_limit'=>array('type'=>'int','length'=>10),
// 'active'=>array('type'=>'int','length'=>1,'size'=>'tiny'),
),
'primary key' => array('stid'),
);
return $schema;
}
function split_test_install()
{
drupal_install_schema('split_test');
}

function split_test_uninstall()
{
drupal_uninstall_schema('split_test');
}.

My drupal website also times out at times, like when i click on module or install any module and try to clear the cache, the website acts too slow. any reason in mind as why could this be happening.

Thanks