Temporary tables are automatically dropped at the end of a session, or optionally at the end of the current 
transaction (see ON COMMIT below). Existing permanent tables with the same name are not visible to the 
current session while the temporary table exists, unless they are referenced with schema-qualified names. 
Any indexes created on a temporary table are automatically temporary as well.

	/**
	 * Clone the table structure
	 */
	public function cloneTableStructure() {
		global $wgSharedTables, $wgSharedDB;
		foreach ( $this->tablesToClone as $tbl ) {
			if ( $wgSharedDB && in_array( $tbl, $wgSharedTables, true ) ) {
				// Shared tables don't work properly when cloning due to
				// how prefixes are handled (bug 65654)
				throw new MWException( "Cannot clone shared table $tbl." );
			}
			# Clean up from previous aborted run.  So that table escaping
			# works correctly across DB engines, we need to change the pre-
			# fix back and forth so tableName() works right.

			self::changePrefix( $this->oldTablePrefix );
			$oldTableName = $this->db->tableName( $tbl, 'raw' );

			self::changePrefix( $this->newTablePrefix );
			$newTableName = $this->db->tableName( $tbl, 'raw' );

			if ( $this->dropCurrentTables
				&& !in_array( $this->db->getType(), array( 'oracle' ) )
			) {
				if ( $oldTableName === $newTableName ) {
					// Last ditch check to avoid data loss
					throw new MWException( "Not dropping new table, as '$newTableName'"
						. " is name of both the old and the new table." );
				}
				$this->db->dropTable( $tbl, __METHOD__ );
				wfDebug( __METHOD__ . " dropping {$newTableName}\n" );
				//Dropping the oldTable because the prefix was changed
			}

			# Create new table
			wfDebug( __METHOD__ . " duplicating $oldTableName to $newTableName\n" );
			$this->db->duplicateTableStructure( $oldTableName, $newTableName, $this->useTemporaryTables );
		}
	}