diff --git a/lib/setup/abstractdatabase.php b/lib/setup/abstractdatabase.php
index c1b611e65545e1da0d0befcb2f23bfb195a83f76..66202251e975c0e735aede219c1fbeea77089879 100644
--- a/lib/setup/abstractdatabase.php
+++ b/lib/setup/abstractdatabase.php
@@ -43,6 +43,6 @@ abstract class AbstractDatabase {
 		$this->dbpassword = $dbpass;
 		$this->dbname = $dbname;
 		$this->dbhost = $dbhost;
-		$this->tableprefix = $tableprefix;
+		$this->tableprefix = $dbtableprefix;
 	}
 }
diff --git a/lib/setup/mssql.php b/lib/setup/mssql.php
index 74ac8f294a9817c9a7667910f1c3c1e736aaa357..5ed0d030c7c9917fe1e917577e1c959e608de5ea 100644
--- a/lib/setup/mssql.php
+++ b/lib/setup/mssql.php
@@ -149,7 +149,7 @@ class MSSQL extends AbstractDatabase {
 		//fill the database if needed
 		$query = "SELECT * FROM INFORMATION_SCHEMA.TABLES"
 			." WHERE TABLE_SCHEMA = '".$this->dbname."'"
-			." AND TABLE_NAME = '".$this->dbtableprefix."users'";
+			." AND TABLE_NAME = '".$this->tableprefix."users'";
 		$result = sqlsrv_query($connection, $query);
 		if ($result === false) {
 			if ( ($errors = sqlsrv_errors() ) != null) {
diff --git a/lib/setup/mysql.php b/lib/setup/mysql.php
index aa0344f686ccfc7628d26e63197fd39d70206c34..1ab1b6ea8ae1b943f4ec640ba73da9f232348f81 100644
--- a/lib/setup/mysql.php
+++ b/lib/setup/mysql.php
@@ -23,7 +23,7 @@ class MySQL extends AbstractDatabase {
 			$this->dbuser=substr('oc_'.$username, 0, 16);
 			if($this->dbuser!=$oldUser) {
 				//hash the password so we don't need to store the admin config in the config file
-				$this->dbpassword=OC_Util::generate_random_bytes(30);
+				$this->dbpassword=\OC_Util::generate_random_bytes(30);
 
 				$this->createDBUser($connection);
 
@@ -46,7 +46,7 @@ class MySQL extends AbstractDatabase {
 
 		//fill the database if needed
 		$query='select count(*) from information_schema.tables'
-			." where table_schema='".$this->dbname."' AND table_name = '".$this->dbtableprefix."users';";
+			." where table_schema='".$this->dbname."' AND table_name = '".$this->tableprefix."users';";
 		$result = mysql_query($query, $connection);
 		if($result) {
 			$row=mysql_fetch_row($result);
diff --git a/lib/setup/oci.php b/lib/setup/oci.php
index 56452c65a59669630de8d9ac9d7c20f17382d58c..cda7ff7c50c98cf2b30aef14da6d190d7e390cc3 100644
--- a/lib/setup/oci.php
+++ b/lib/setup/oci.php
@@ -65,14 +65,14 @@ class OCI extends AbstractDatabase {
 			//add prefix to the oracle user name to prevent collisions
 			$this->dbuser='oc_'.$username;
 			//create a new password so we don't need to store the admin config in the config file
-			$this->dbpassword=OC_Util::generate_random_bytes(30);
+			$this->dbpassword=\OC_Util::generate_random_bytes(30);
 
 			//oracle passwords are treated as identifiers:
 			//  must start with aphanumeric char
 			//  needs to be shortened to 30 bytes, as the two " needed to escape the identifier count towards the identifier length.
 			$this->dbpassword=substr($this->dbpassword, 0, 30);
 
-			$this->createDBUser($this->dbtablespace, $connection);
+			$this->createDBUser($connection);
 
 			\OC_Config::setValue('dbuser', $this->dbusername);
 			\OC_Config::setValue('dbname', $this->dbusername);
@@ -136,10 +136,9 @@ class OCI extends AbstractDatabase {
 	 *
 	 * @param String $name
 	 * @param String $password
-	 * @param String $tablespace
 	 * @param resource $connection
 	 */
-	private function createDBUser($tablespace, $connection) {
+	private function createDBUser($connection) {
 		$name = $this->dbuser;
 		$password = $this->password;
 		$query = "SELECT * FROM all_users WHERE USERNAME = :un";
diff --git a/lib/setup/postgresql.php b/lib/setup/postgresql.php
index 67e4f901a9191ab53abdd17d639ad7fec4921120..d5b135a957790a5be3b19c0c6034ca3c96110b58 100644
--- a/lib/setup/postgresql.php
+++ b/lib/setup/postgresql.php
@@ -33,7 +33,7 @@ class PostgreSQL extends AbstractDatabase {
 			//add prefix to the postgresql user name to prevent collisions
 			$this->dbuser='oc_'.$username;
 			//create a new password so we don't need to store the admin config in the config file
-			$this->dbpassword=OC_Util::generate_random_bytes(30);
+			$this->dbpassword=\OC_Util::generate_random_bytes(30);
 
 			$this->createDBUser($connection);
 
@@ -69,7 +69,7 @@ class PostgreSQL extends AbstractDatabase {
 			throw new \DatabaseSetupException($this->trans->t('PostgreSQL username and/or password not valid'),
 					$this->trans->t('You need to enter either an existing account or the administrator.'));
 		}
-		$query = "select count(*) FROM pg_class WHERE relname='".$this->dbtableprefix."users' limit 1";
+		$query = "select count(*) FROM pg_class WHERE relname='".$this->tableprefix."users' limit 1";
 		$result = pg_query($connection, $query);
 		if($result) {
 			$row = pg_fetch_row($result);
diff --git a/lib/setup/sqlite.php b/lib/setup/sqlite.php
index 0b96ec6000930dab5cbc265c44c8258dcdb95774..4b0a572bb39d3bdca62225159a0beb4db5352a90 100644
--- a/lib/setup/sqlite.php
+++ b/lib/setup/sqlite.php
@@ -6,6 +6,7 @@ class Sqlite extends AbstractDatabase {
 	public $dbprettyname = 'Sqlite';
 
 	public function validate($config) {
+		return array();
 	}
 
 	public function initialize($config) {